I have 57K miles on my 1.8t. It runs great except for the first start of the day. About half of the time, first thing in the morning it runs rough for the first 30 seconds. Like it is running on 2-3 cylinders. Then it sorts out and runs great the rest of the day. I took it to my dealer where they charged me $200 to replace the spark plugs. I would prefer to fix this myself if I can.
View 2 RepliesI had a hard brake from 45mph to 0 last week, now when I start the car or brake hardly, there is beep. What is wrong with it?
View 7 RepliesMy partner's SEL (not Premium) with 2.5L sometimes stumbles/"hiccups" from a stop with the air conditioner on. For example, starting off at a traffic light. My partner now says it happens usually while sitting stopped with the ac on.. It's just a momentary hiccup-type thing, but the engine doesn't stop. I have to say, I've ridden in the car with him quite a bit in traffic and it hasn't done that while I've been in the car.
View 2 RepliesMy 02 F150 4.6 has 84K miles on it, and started stumbling/hesitating during accellartion about three weeks ago. Before this problem started (about 2,000 miles ago), I installed a new fuel filter and air filter. Since I noticed the problem, I installed new plugs. The problem didn't go away, so today I checked the fuel pressure. At idle the pressure is 32psi with the vacuum line left on the fuel pressure regulator (30-45 is normal as per Chilton's), and 42 with the vacuum line off (40-50 is normal as per Chilton's). I also had someone else rev the engine so I could observe, and found that the fuel pressure went as low as 28 when the engine speed was quickly increased. The standing fuel line pressure is 30 (30 is normal as per Chilton's) Does this sound like a fuel pump problem, or is there something else that I'm missing.
View 10 RepliesI've got a misfire problem with my Focus. It started about a month ago and did not trip a code until last week. It stumbles on acceleration between 2,000 and 4,000 rpms. It is only a slight stumble and although noticeable, it does not impede driveability much. Last week I was able to get it to finally trip an OBD code. P302 - Cylinder 2 misfire. I changed the plugs and wires with no effect. I thought I had it narrowed down to the coil or injector until my wife noticed a new wrinkle.
Under normal driving conditions the misfire is annoying, but my wife found that if she turns on the A/C, it is undriveable and will not accelerate past 30 mph without some patience and a neck brace for the bucking. My first thought was the A/C compressor was freezing up. I turned off the A/C and left the blower on and it would not stop missing. I turn off the blower and it smooths right out to the annoyance I described first.
Right now I drive the car without A/C and blower whenever I accelerate. If I'm going a steady speed, all is well and I can run the blower and A/C.
I just bought a used 2007 Hondai santa fe. 65K. Loved it until four times when I turn key to start the car 'stumbles'. Dealer finds nothing wrong. What I notice today is I did not have my foot on the brake. My 11 yr old Subaru started w/o (not good I know) so I developed a bad habit. So now I wonder if this is not a problem but rather a safety feature and I need to always have my foot on the brake at start.
View 2 RepliesIn the mornings my 6.8 gasser stumbles when started cold ('cold' could mean an overnight temperature of 50-70 degrees F). This stumble lasts anywhere from 2 - 5 seconds and then it revs on its own to ~1,500 rpm. I'm not giving it any throttle upon start-up. Other than this the truck runs fine (~110k miles on OEM engine). Any thoughts on what may be causing this?
View 1 RepliesDriving the 98 Passat this morning everything fine. Then total loss of power, give it any gas and it stumbles and almost dies. Idles fine, can rev it in park or nuetral. Starts and idles fine, give it gas and it starts to move thens just dies down. If leave foot on accelerator, will move at idle pace but stumble with no power whatsoever. No "check engine" light. DOn't have a VAG tester but do have OBDII. Haven't checked if any stored codes. Will an OBD code be stored an not light up the CEL?
View 5 Replies1990 chevy silverado 4x4... My truck stumbles when you start it and within 5 seconds or so clears up and runs smooth.. I changed the fuel filter , still the same result.
View 1 RepliesOkay so I have a 2003 Nissan Maxima 150k and the problem that I'm experiencing is that when the vehicle is in drive my foot on the brake for example at a red light and I have the AC on the engine will begin to stumble similar to a misfire however no check engine light will be displayed if I were to turn the AC off and sit at a red light in here with my foot on the brake the car idles fine and smooth the car currentl drives fine accelerates fine idles fine it's only when I'm stopped with my foot on the brake and the car and in drive with the AC on that the engine stumbles accelerating or cruising any speed above idle with a/c the runs smooth its only at idle and the simple is not predictable it happens often but at random intervals
What I've done so far 1.5 years ago I put in iridium spark plugs Recently cleaned the throttle body its a electronic throttle body Fuel pump and filter were replace in March 2016I tested the alternator put a load on it to see if the engine would stumble but it didn't
My a/C blows cold air and everything in the car works.
This 97 F150 4.2 is new to me, originally a very base 2wd white fleet vehicle, with 189,000 miles, runs smoothly and quietly, idles well, transmission shifts smoothly. Gets reasonable gas mileage.
Problem statement: the truck has an intermittent starting problem. The failure to start happens about 5-10% of the time. The motor will turn over fine, but but immediately stumbles while trying to start. Turn key off and then re-start attempt will be again followed by a bucking stumble. Some times the motor might try and run for 2-3 seconds bucking and stumbling. It is possible the problem happens more often when the truck is warm and has been shut off for 15 minutes or so. Once the problem happens it is very repeatable. It won't start again unless I wait about 30 minutes to an hour. Once it starts it seems to run very nicely. I have noticed some times when I go to successfully start the truck it might run roughly for the first 3-4 seconds bucking and sputtering a bit and then smooth out and not have an issue until the next re-start attempt.
The truck runs so nicely when it is running I doubt it is an issue with the plugs, air filter general tune up. Could it be an intermittent fuel pump issue? The next time it occurs I will check fuel pressure. Could it be fuel pressure regulator? Also tested by fuel pressure. ECU? The truck runs very nicely most of time that seems like a long shot. Crank sensor? Bad fuel? I did add some dry gas.
95 explorer 4.0l ohv. I go to take off and then come to a stop after about 10-15 feet, i just give it a little gas then lightly press the brake, rpm's drop to around 400-500 then back to normal. I have replaced:
IAC
MAF
Plugs & wires
Coil pack
intake manifold gaskets
fuel system cleaner
fuel filter
air filter
I own a 2003 Ford Ranger 4x4 Automatic with the 4.0l V6. I bought the truck a little over two years ago with 150k miles. The Engine had alway had a slightly rough idle and I never really noticed until a friend pointed it out at around 170k. Every time the pump engages after a short warm up period there is a distinct stumble in the engine, although it never stalls or trips a check engine light. I have replaced the spark plugs with four prong pre gapped Bosch platinum plugs and new plug wires as well. I have installed an Optima red top battery that tests at 1100cca and have tested the voltage draw when the AC engages and it only drops .2 volts from 14.48v to 14.24v. I thoroughly cleaned the MAF sensor and before changing plugs I ran a can of non chlorinated brake cleaner through the throttle body to clean out carbon deposits and dirty throttle body. The engine still stumbles. Yesterday at 182k I disconnected the low pressure switch on the AC pump and boom, smooth low idle with no stumble. What could be wrong with the AC pump that could cause this stumble in the engine?
View 12 Replies I am 2nd owner of 98 Ford Explorer Eddie Bauer V6SOHC. Vehicle is almost showroom condition w/ 70,000 miles and properly maintained.
Problem: engine seems to stumble quite frequently and is most noticeable when ambient temp is above 60*. Highway speeds , 40MPH doesn't matter. RPMS drop but it has completely shut down only twice in the last 9 months.
There are no codes. Plugs and wires changed several months ago, fuel pressure checked by Ford and it's ok, injectors cleaned at dealer, MAF seems ok so I am at a loss. Since there are no codes diagnostics don't work. Except for the issue above, this is a very nice reliable vehicle.
recently I've been having this problem with my '90 C1500 305. The engine stumbles after holding down the throttle slightly for any time longer than 5s and then releasing, like if I apply the gas lightly to slowly roll up to a light. When i let off the pedal, it will stumble then recover after a second. Sometimes its so bad it almost stalls.
There is no stumbling after heavy throttle inputs. Not sure what causes this.
So I picked up a 2002 passat 1.8T autotragic from a guy because a shop said it had a bad computer. After bringing it home and talking to some local volkswagen mechanics they said it couldn't be the computer because the car would still crank. I jumped the trigger wires and the car starts right up no problems and runs perfect for sitting for a year. My question is what could be the problem? I changed the ignition switch and replaced the 40amp fuse by the computer. I am trying to flip the car so I am hoping its not a big problem and have to part the car out.
View 3 RepliesI've got 120,000 on my 08 manual Accent. Recently I've been getting white smoke after running it hard. It happens like this. I slow down from 70mph or so with the clutch engaged to about 40mph, then upon acceleration the engine stumbles and white smoke pours from the tailpipe. My guess is a leaky head gasket.
I had the dealer go through it. They pressure tested the cylinders and put a scope in them. They claim nothing is wrong with the engine.
I mentioned since they can vouch for the engine now, I'd like to get an estimate on trade in value. I don't think I want to keep it much longer.
2000 ML430 230,000 mi. The engine starts and all is fine until I hit a spot of rough pavement or a minor bump and the engine "stumbles," feels like it has cut out or starving for fuel. I have been unable to tell whether it is left front or rear right tire or corner of the car that hits the bump and starts the engine running on limp home.Once it happens and I stop at a light then hit the gas, I can count to 4 before the engine responds, making left turns dangerous. MB factory service since new. The dealer has replaced spark plug wires, spark plugs, crankcase sensor, gas pedal sensor and still the same problem. I think it is a loose wire or ground since it only happens after I go over a bump(even a seam on concrete any jiggle does it).
View 3 RepliesIs there an alert setting to signal when a regen starts? My engine stumbles badly a few seconds after a regen starts. The dealer hasn't found the problem. Right now I just keep an eye on the soot level gauge.
View 14 Replies2001-F150 5.4 Eng. bucking/stumble. I think my problem is slightly different than what I am reading about. Here is what I get (125k miles):
* Engine only bucks/stumbles intermittently and not at idle or at harder acceleration (this bucking is really harsh and makes the truck feel like a learner trying to drive a manual transmission and it is jumping down the street). The engine stumble is not a regular timing such as a cylinder going out and staying out for a period of time. It is quite a random pattern to the jumping
* Originally thought it was humidity related, but now I realize it happens in any climate
* No stumble in neutral at any rpm... only at a stop if I put it in a power brake load.
* When the stumble shows up, it seems like the throttle is around 10-25% (my best guess)
* Sometimes goes days without issue, but sometimes every ride and virtually every acceleration.
* Normally no stumbling at highway speeds, unless going up a hill.
* Every time it stumbles, it can be eliminated by either backing off on the accelerator some, or hitting the accelerator harder.
* No engine codes or CEL has ever come on
* Fuel mileage appears to be the same before and after the trouble started
Here is what I have done to try to correct it:
-> Fuel related (bad gas)... tried to run the tank as close to empty and fill it with fuel from different stations... when this didn't work, I have added HEET to it to dry up any water in tank.
-> Fuel delivery... replaced the fuel filter... seemed to work for one day, but then the gremlins came back.
-> Fuel delivery... ran multiple injector cleaners through tanks of gas.
-> Intake... replaced the filter.
-> Electrical... I don't believe this is related, but my battery died... parts store tested the system and stated the alternator was bad... replaced it, and took the old one to the parts store for bench testing and it was 100% OK... even thought the old showed OK, I left in the new one as a precaution. Only other item was a set of plug changes around 30k miles ago... I think I put in the super duper Bosch plugs with a lifetime warranty.
Current thinking and items I don't understand:
A) The bucking is so severe, it appears to be a random harsh loss of either fuel or ignition. A component that has failed electrically should give me a fault code with this level of severity. No trouble codes or indicators to electrically sense this disturbance...
B) For the fuel path, the most likely item is bad gas and I emptied my tank by running it as close to empty as possible and then used different gas and HEET to eliminate water. THIS MIGHT STILL BE THE CAUSE???
C) Another one for the fuel path is an intermittent fuel pump electrical connection or a weak pump from a pressure point. But if this is the cause, then why does it dissappear upon harder acceleration?
D) One last fuel thought is injectors... perhaps one or more have a range of delivery that they don't work properly... but this doesn't make much sense as at idle and harder accels are fine
E) From an ignition standpoint, perhaps I have failing COP's. I have not just gone out an replaced them due to my limited budget and the difficulty I read about changing them. Again, if one of these is failing in an either open or short condition, the computer should set a code for a misfire for the related cylinders. I get nothing. Hence my hesitation in making this change so far.
One thing i don't understand from the various posts is that the cops can fail under loading. what makes this happen as electrically, i don't think they can detect a load or not? it is hard for me to also understand why my truck would allow me to back off on the throttle or hit it harder and the issue disappears.
'03 Excusion 6.0psd....new batteries a year ago, new starter a month ago, head gaskets etc a year ago....
Today I go out and start it up, no problem. Gather up the kids and head out to load up. When I climb in, I hit the unlock button to make sure the kid's doors are open and the engine stumbles.
I thought maybe I was imagining things so I hit it again and the same thing happened but it died but fired right back up. Drove the kids to school and it ran fine, no problems.