Passat (B5) :: Under Acceleration Buck And Lose Power?
Mar 17, 2008
My fiance is having issues with her car. It seems under acceleration to buck and lose power. I know more about 1.8t's but hers is the v6.
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Mar 17, 2008
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Ford 6.0L Power Stroke Diesel :: Surges / Buck At Acceleration - Gallop / Miss / Stall At Idle?
I've seen the gods of the diesel engine do some amazing things on these forums, so after a year of pulling my hair out, I've signed up to try this myself.
This time least year,I bought a 2004.5 6.0L F-250 with 196k on it to haul around the state for my new business. At this time, I knew nothing about diesel engines AT ALL WHATSOEVER, but I've never been afraid to tackle anything and mechanics are not totally foreign to me. Not to mention, I was hoping everything might just go peach-ily for at least a couple years. (for what it's worth, My dad and his family are mostly shade tree mechanics and I'm a power plant operator so mechanical concepts are not totally foreign to me, just never had a diesel before)
To begin, I purchased the truck and everything was fine for about 2 weeks. Then abruptly one morning I noticed a couple of hefty surges on the way to work. Then, on the way home I thought all was well until about half way home, it did it again! as I was pulling up, it galloped once I pulled my foot off the pedal. like ba-DA-DA-DA-da-da-da-da-da-da-DA-DA-DA-DA-DA-da-da-__ and then STALL! Shaking with concern over potentially an awful purchase, I turned the truck back on only to find... that it's fine?!?? No problems for the next two days and then it happened again. then good for a week, then again. then good for 2 weeks, then again. so then I bought auto enginuity and an edge insight to do some troubleshooting. Let that sink in as I explain it's history a bit.
-All but one injector is ford remanufactured the other is stock (was never told which one)
-replaced head gasket with another OEM
-ARP Head Studs
-EGR delete
-HPOP AND STC fitting both replaced
-FICM replaced
-Oil cooler replaced 50k ago
-ICP and pig tail replaced right before my purchase
- Has been through roughly a handful of ICP's since I've had it (I'll explain)
-I've cleaned the EBP tube a lot and updated it to the newer ford sensor with the flare fitting
-I use Rotella T6 5W40 and CAT ELC-1 Coolant.
-Deltas are under 10 at normal driving
-I typically drive under 2200 rpm until warm then like a banshee at operating temps.
Now one year later, its not fixed, but I feel like I'm close.
The DTC's I have seen are ICP sensor circuit intermittent (I think po2884) and Power Blance contribution failure from cylinders #2 #7 and #8 but never at the same time.
Every time I replace the ICP, it will be problem free for about 6 weeks and then it will return full force (surging and galloping when warm about 50% of the time)
During a possession I see the following:
*Cylinder power contribution test yields no issues at idle or when cold. when "possessed", the whole baseline across all cylinders goes up and all cylinders dip and return at random. none singled out
*ICP voltage fluctuating from ~.6v to 1v (.24 @koeo) *Also during a surge*
*ICP PSI dancing up and down ~600 to 900psi (0.0 @koeo and ~500 at normal warm idle) *Also during a surge*
*IPR% bumps up and down ~25% to 30% (15%@ koeo and 23% at normal warm idle) *Also during a surge*
*FICM Voltage anywhere between 47.5v and 49v
*EBP is normally 15-20 psi
*Boost is 1-7 normal and is not affected by "possession"
These numbers have taken a long time to get since it will only be possessed for about 3-10 seconds at a time and then will disappear for days. The stall has only happened about 5 total times in a year. The surging is much more frequent. I usually get a buck or 2 on any given trip that is longer than a half hour but NOT IMMEDIATELY AFTER AN ICP REPLACEMENT.
On one occasion, I noticed that the ICP PSI actually tanked to about 350 right before the IPR went from 25% to 40% right before a posession. I was driving about 35mph through town at the time.
Here's my thoughts...
- Did that one occasion clue me in to an intermittent HPO system leak causing the truck to briefly over-compensate by spiking the IPR?
- Is my ICP pig tail jobby done incorrectly? If there was a short, wouldn't I see the volts drop to 0? I have another one and will replace to rule it out.
- I have yet to test my fuel pressure, but I figured if it was low, I would have lost injectors by now. (I replace filters probably too often but next empty tank, I'm dropping it and checking the screen and strainers)
I should also mention that I have buzz tested the injectors and I can hear each one clear as day, and that for REALLY long trips, it actually returns to normal. In other words, my window of death is between 30min and 2hrs of driving; invincible after.
Volvo :: 95 / 96 850 2.0 T5 Engine Lose Power During Full Acceleration And At Higher Revs
In the past month for 3 times I've experienced problems with engine start (starter turned properly and I could hear fuel pump working). Yesterday however, I noticed that during full acceleration - at higher revs, engine suddenly loses a bit of power and at the same time you can feel kind of rattling or vibration in the engine. After letting off the gas pedal everything goes back to normal ... Besides, everything seems to be normal. Lambda control light does not light up indicating any errors. However I get a faulty knock sensor code 1-4-3. To my intuition the problem is with the ignition (but approx. 2 years ago I replaced distributor cap + rotor and the plugs + ignition wires were replaced about 3 years ago) or the amount of fuel in the mixture, but that could be caused by many things.
View 1 RepliesToyota - 4runner :: 1996 - Lose Power For 2 To 10 Second Then Go Back To Normal Acceleration
I have Toyota 4runner 1996 4 cylinder. it was running good (from time to time I would lose power for 2 to 10 second than it go back to normal acceleration). I had the check engine light on for almost 8 month. last week I took the car to mechanic shop for diagnosis. the mechanic changed the spark plugs and after that the engine lost power. the car cannot go over 30 or 35 mile per hour. He changed the spark plugs and put different ones, same thing he put the old ones back same problem, he changed the wires, the fuel filter, air filter, the distributor and rotor, but still the same problem. the problem is that the check engine light is off now and there no codes.
View 2 RepliesElantra HD (2006-10) :: Buck Or Hesitate During Acceleration
Recently the fuse for the ECU was pulled. From what I have read it reset the computer. Since this happened the car will buck or hesitate during acceleration. What is a good starting point to resolving this issue.
View 9 RepliesTiguan :: Stutter And Buck On Light And Hard Acceleration
About two months ago, my EPC light came on and my check engine light started flashing while I was driving home from work. Never heard of/saw that EPC light before. The car started to stutter and buck really bad when trying to accelerate (on light and hard acceleration). Also, when sitting idle (like at a red light or stop sign) the car would still buck but not as bad as when driving. The only time the car doesn't buck is when I am cruising, like after I just get done pressing on the gas and the car is coasting basically. I call the mechanic the next day and he tells me right off the bat, it sounds like a Crankshaft Position Sensor and to drop it off so he can look at it. So I drop it off, he tells me he believes it is just a bad coil on cylinder 1, so he swapped it out and gave me an oil change (it was due for one). Picked my car up on a Wednesday, it seemed fine. Then on a Saturday same issues and same warning lights came back on. So I had it scanned at Autozone, misfire on cylinder 1 and 3, random cylinder misfire and multiple cylinder misfire, so I call him and tell him, he said just bring it back he'll swap it out. I changed the coils myself since it only takes 10 mins. The car seemed fine for about a month. Then two weeks ago, all of the same issues are back and same warning lights.
Had issues with the EPC light? Also, is any truth that the Crankshaft Position Sensor can be related to this or was the mechanic completely wrong? Read another post by someone else and there was talk of carbon buildup. My friend is mechanic and said that he thinks it might be a fuel related issue or electrical, since the issues keep coming back. Also, it misfires more when the heat is on and seems like the interior lights flicker a little when it's misfiring at idle, it's very subtle, definitely notice it so I don't know if it's electrical, fuel related, carbon build up or what.
-February of 2014, I had a fuel pump replaced by the dealer (it was for a recall)
-Back in January 2015, I had the ignition coils and spark plugs replaced by a friend (who is a mechanic).
-In July I had the lifters replaced (by the same mechanic I called)
-Been up to date with oil changes
-Use plus gas from Citgo
Going to drop it off at the dealership tomorrow.
Impala - Chevrolet :: 2003 - Intermittent Shutter / Buck On Quick Acceleration
I have a 2003 impala I just bought and it has an intermittent problem. Sometimes when I step on the gas the motor will 'slam'---kinda like if the motor mounts were bad but they look good and it doesn't always do this. Also, if I hit the gas pedal hard and then almost as quickly let off the gas pedal I get the same effect--shutter/slam. I suspect the mounts but they look fine. If I keep on the gas all gears shift very smoothly. Gear shift is smooth thru all gears if I floor it or go slowly accelerate so it seems not to be the transmission either.
View 5 RepliesPassat (B6) :: Glow Plug Lamp Light Came On While Driving And Car Seemed To Lose Power
I have a 2005 B6 TDi 2.0 sports 140bhp passat and have encountered a glow plug lamp problem. The light came on while i was driving and the car seemed to lose power. We then switched it off and restarted and it was fine but then the problem recurred a few days later. The light has come on both times when i have accelerated on the motorway. What it could be?
View 2 RepliesSaturn - Vue :: 2004 - Lose All Acceleration After 3000 RPMs
I have a 2004 saturn vue. It is a 5 speed standard with a 4 cylinder engine. Now that I have that posted here is my problem. I have normal acceleration up until I hit 3000 rpms. At that point my low engine power light comes on and I lose acceleration. To explain that better, if I take my foot off the gas pedal completely and then try accelerate again nothing happens. My engine stays on but I do not have any reaction when I push on the gas pedal. When I run the computer codes it says it could be my accelerator pedal sensor or my ecm. I do not want to have to replace the ecm if I have to due to how expensive it is.
View 8 RepliesMercedes :: 2001 E320 Seems To Lose Acceleration Suddenly And Unpredictably
We have a 2001 E320 4-Matic. Recently, it has developed a serious problem. Every now and then, when I come to a stop (e.g., at a red light), the car would shake/vibrate significantly. Even more importantly, the car seems to lose acceleration suddenly and unpredictably (not necessarily correlated with vibration at the stop). The latter problem goes away "for the moment" by switching off the engine and then restarting it. The Check Engine light has come on as well. The codes that are diagnosed are P2001, P2003, P200F, P2082, P2050, P20151, P2055, and P2053.
While there are several issues with the car, I am most concerned now with the two issues I highlighted above - sudden loss of acceleration and the vibration while stopped (both happening unpredictably). I took the car to two mechanics. The two mechanics seem to sharply differ on how to resolve the "sudden and unpredictable loss of acceleration" issue. One mechanic (Mercedes dealer) attributes the problem to issues with EGR valve and claims replacing that will fix the problem. The other mechanic attributes the problem to the Catalytic Converter which he says is broken and is causing sudden loss of acceleration (and yes, there was a rattle some time ago). The second mechanic does not disagree that the EGR valve (and the secondary air injection system) has issues but he says it is the Catalytic Converter which is causing the core problem of sudden loss of acceleration (and yes, there was a rattle some time ago).
Passat (B5) :: 2000 1.8T Starts To Buck And Then PSI Goes Down To 10 Really Quickly
ok i have a 1.8T atw passat 2000. when boost 18 psi my car starts to buck and then my psi goes down to 10 really quickly like something is being cut off. i also have a p0301 misfire in cylinder 1. I switched my ignition coils around and replaced one and i also changed my spark plugs(not the cheap autoparts store kind). i checked my vacuum hoses and no tears. i put fuel injector cleaner in my tank when i filled up ( two bottles). it might be my fuel injectors but that would be too easy to fix. So I am thinking its something mechanical. I want to know what could be wrong mechanically. My friend thinks could it be a blown head gasket. is this true?
View 2 RepliesPassat (B5) :: 2003 Car Would Start To Buck Occasionally While Cruising On Freeway
I've got an 03 Passat with 110,000mi on the 2.8L 30v and 01V. I've had this intermittent problem for a while. Occasionally while cruising on the freeway, the car would start to buck, feeling like the trans was slipping in and out of gear, but rpms would stay constant as far as I remember. Also, the ASR light would come on and flash. The car would continue bucking until I pulled over and shut the car off. When I restart, all is fine again.
The dealer pulled codes and only found a EVAP canister purge valve code. They fixed that and said that should take care of the aformentioned problem. I didn't think the code was related to my problem and sure enough, it wasn't. My car still does it, but now there seems to be more related to this problem.
I was driving the other day on the freeway again, this time with my cruise control on. Everything seemed fine until the accelerator pedal dropped to the floor and the car began to accelerate on its own. I quickly switched off the cruise and braked to slow the car down to my original speed, and then the car continued bucking as it always had, now with the ASR light fully on. Pulled over again to restart, problem gone again. What gives? Went to have codes read again and nothing is found.
Passat (B5) :: Rear Tires Lose Air Frequently?
I recently purchased a b5.5 passat v6 4motion. I noticed that the rear tires lose air frequently and i wanted to check them for a possible flat fix. However, the car did not come with a wheel lock key. How can I remove the wheels? where can i find the key lock?
View 1 RepliesToyota - Sienna :: Lose Power To Radio / Air Conditioner / Power Windows And Surges When Going Down The Road
I have a 2002 sienna that will lose power to radio, air conditioner, power windows, surges when going down the road. So far it only last for a little while. And for a while now there has been times y…
View 2 RepliesFord 7.3L Power Stroke (1999-2003) :: Truck Would Stumble And Lose Power / Idles But Won't Rev Up
Problem started 2 days ago, driving around and my truck would stumble and lose power. Give it gas, won't rev up but it cleared and ran fine for a mile or so then it comes back (off and on all the way home). Check engine light didn't come on the first few times, came on a couple times on the way home (maybe 4 mile trip) but goes off when the truck runs fine. Thinking it was maybe the fuel pump (got 140K on the stocker). Talked to a few friends, some thought it was algae build up in the tank that was clogging the filter on the pump, underhood filter changed a couple hundred miles ago. Looked fine with slight brown build up at bottom of bowl when I replaced it.
Ran it around yesterday with a friend of mine and his scan tool hooked up, acted up once, check engine came on for a few seconds and shutoff. No code and for some reason we couldn't get it to live data while driving. I dumped in an algae eater yesterday and left the truck overnight since I had to work. Got home this morning to run her around the block to circulate the eater. Truck started and idled fine, went to pull out and she won't rev up, pumped the gas and NOTHING! Check engine light is on now but don't have a scan tool handy to read it. I heard the truck will store the code?
What this problem might be? What's a good scan tool for our trucks that can live data as well? CPS is good and already did the UVCH mod.
Ford 7.3L Power Stroke (1999-2003) :: Hard To Steer - Sometimes Lose All Power Brakes
I've got an E99 powerstroke. Recently it's been getting hard to steer, if not impossible. When I'm parked i can't turn the wheel and it gets better if i Rev the engine up, driving is usually ok and going around corners. It's just low speed, low rpm that it won't.
Also every once in a while when braking it feels like i lose all power brakes. The pedal goes to the floor and the brakes let go, then i can feel the pedal pump back up and i get a good feeling brake pedal again that actually stops well. All this happens within about a seconds time. But the steering is by far the worst.
I just did the power steering flush with atf and it didn't work. I'm thinking i need a new power steering pump, but want to ask here first to make sure. The truck has 290,000 on it, and it never has been replaced to my knowledge. I bought the truck with 147,000 however so it may have been done before that.
Ford 6.0L Power Stroke Diesel :: Truck Will Sometimes Momentarily Cut Out And Buck A Couple Of Times
I replaced the speed sensor in the differential yesterday, but it didn't make a lick of difference. I've been having intermittent problems with the speedo ever since I bought the truck. When the speedo starts acting up, the truck will sometimes momentarily cut out and buck a couple of times. It was first mentioned this post, post # 35. I had the truck in the shop for a new oil cooler, EGR delete, standpipes, dummy plugs and STC fittings, and when I got it back it ran worse than before as detailed here in post #1. It turned out I had a torn IPR screen.
I replaced that and it cleared up all of the problems I had except for the speedo problem I originally had. The truck actually ran perfectly on the way home from work yesterday, about 20 miles. No speedo problems and no cutting out. This is not unusual, as the problem is only intermittent. I put the new VSS in last night but did not drive it until this morning. This morning, same thing again, speedo swinging crazily. When cruising about 70 it the speedo would suddenly jump up to about 90 and that is when the truck would cut out and buck a couple of time. The VSS is a Dorman product and proudly displays "MADE IN CHINA".
Should I try a better quality sensor? Rock Auto sells an Airtex/Wells sensor that seems to be of good quality, but I can't determine where it was manufactured. The only reason I bought the Dorman is because I could get it next day from Amazon. Should I be looking at another source for the problem? This is very discouraging because this one thing is what is keeping the truck from being mechanically sound, and I'm trying to get it ready to tow an RV this summer.
Ford 6.0L Power Stroke Diesel :: 2005 Truck Buck / Miss Not Just Under Load
Truck has not been bullet proofed and has aftermarket air intake. Truck has 185km on it (purchased at 160km a year ago). For the Ham Radio guys out there, this is the most electrically noisy vehicle I've owned with S9+ noise while accelerating and S7 going down the highway ...
The faults show up as:edit Can be hard to start cold, takes couple of tries if it's been sitting for a bit (week or more)
No power when cold, that is a lot of pedal results in little power
Misses a lot when cold
Light blue smoke when missing when cold
When fully warmed up which takes 15 minutes of idling regardless the time of year:under load (heavy acceleration while loaded or not, or just in towing, or carrying) it misses a few times a minute, otherwise runs well
It feels like it just doesn't fire a cylinder if it were a gasser, or as if the spark plug weren't connected, but it's not a constant miss, it is intermittent. No load means hardly any misses. Load means lots of misses even running down the road. Should be pulling hard up a hill where it misses lots more.
What I've looked at :
FICM voltage 47.8 standing, 47.6 cranking and running.
FICM is aftermarket and there are no cold solder joints.
Added Archoil 9100 with no change
Wires to FICM are tight and connectors aren't cracked
edit Wires to Injectors are tight and connectors aren't cracked
Exhaust temps range between 500F and 800F during any of these events
Basic ODB reader shows no codes
I'm looking for a couple of things - I'm not much of a mechanic so this has to go to a shop for diagnosis and repairs. Before I run it someplace, what sort of diagnostic tools should that shop be equipped with to find out what's going on? Also, given what you know of the problem, am I likely to damage things if I continue towing activities?
Ford 6.0L Power Stroke Diesel :: Alternator Warning Light And Lose Power Steering Soon After Brakes Got Stiff
I just wanted to share with you all a cautionary tale about belt tensioners and idler pulleys. I am now a firm believer in installing the aforementioned items when you replace your drive belt. 15000 miles ago I replaced the drive belt and didn't heed the warning of some here on the forum.
For the last month or two I have noticed what sounded like road noise which I dismissed because I had just had new tires installed that had a more aggressive tread pattern than my previous tires, I also noted that the ECT had been a bit higher than normal, like running in the high 190's to low 200's on average.
Well while driving today I get the alternator warning light and lose power steering and soon after the brakes got stiff, this was followed by ever increasing ECT which got to 242* before I could get it off the road and shut down. It is too early to tell if the noises and the ECT temp rise were the result of this tensioner going out...
For what its worth the only tools required were a 10MM end wrench and a bit of skin to get the job done.
Ford 7.3L Power Stroke (1999-2003) :: While Driving F250 Start Chugging / Lose Power And Shut Off
I have a 99 F 250 7.3. It runs fine at idle even for a long time. When I drive around the block a couple of times it will start chugging and lose power and shut off. I have been mixing fryer oil with the diesel. I changed the fuel filter, oil change, crank sensor and fuel pump. I added 15 gallons of diesel and diesel treatment. Pulled fuel filter and bowel is full I'm not sure where to look next.
View 1 RepliesFord 6.0L Power Stroke Diesel :: Sudden Buck / Surge Accompanied With Black Smoke
So my buddy was driving my truck and boat through Amarillo and suddeny had a buck/surge accompanied with black smoke. I left my torque app with him. Its throwing codes: P2287,2285, and P????(fault log got erased and I'm going from memory) concerning #8 cyl. I got there today and we noticed coolant leak on left side. Its small and I cant tell the source, but it is wetting the exhaust manifold on left side. Also now its blowing white, black, grey smoke. At idle its more white/ grey. Under load it mixes a little blck in. I only had time to check the ICP on torque and at idle its bouncing from 0.9 to 1.1. Unplugged ICP ran about the same. Still started and idled fine with white smoke. No oil in ICP or connector.
So I'm no expert but I think ive got a bad icp and something else going on. I didn't pull the egr valve and look so no idea on the cooler ,yup syill have the cooler. Degas has a small amount of white residue directly under the cap but no puking. Degas is just below the max line (on the sticker).
One other note only code originally was the 2287 last night. Now this am there was the other codes ref'd above.