Ford Excursion :: 2000 - Hesitation / Surge And Stumble Over 1500 RPM
Jan 24, 2015
I recently picked up a 2000 Excursion with the 5.4 V8. Engine has 150,000. I got it cheap because it has a surging problem over 1500 RPM. This problem is intermittent.
I have 1 DTC. P1000 which is OBDII checks not complete. I cannot clear this even using the factory procedures. FYI..I have a snap on solus scanner. I think this is a voltage problem, If you try to start the engine with the scanner plugged in, the scanner shuts off, so I'm thinking the PCM loses battery power supply when the starter engages, resetting the PCM.
This problem is NOT a miss.... something isn't opening or shutting off above 1500 RPM. This truck doesn't have an EGR system, it has the EVAP system. This may be the problem, thats why I'm here. OK. heres a list of what I've replaced since I started working on it.
Engine oil and filter
air filter
fuel filter
8 COP's
8 plugs gapped properly
cam position sensor
IAC sensor
MAF sensor
Removed throttle body and cleaned.
Vacuum checks. 22" at purge valve,fuel dia, and vacuum canister
Checking with the scanner at 1500 RPM with problem
SFtrim1% bounces between5-15
SFtrim2% bounces between2-0
LFtrim1% bounces between11-13
LFtrim2% bounces between 5-6
O2S11(mv) bounces between 200-781
O2S21(mv) bounces between 200-800
Ssystem is in closed loop holding throttle at 1500 RPM... Note engine surges when at the RPM or above. I'm thinking the engine is lean, not sure how to read the trim numbers...
Idle is fine ... Problem is intermittent ... Also noticed that engine will only advance spark to 30 degrees @2000 RPM during this problem. I have seen it advance to 38-40 degrees when I do not have this problem, so I kind of understand the power loss,knock etc due to the timing, my question is whats causing it to do this?
EVAP question.... The purge valve should open according to PCM command a certain value, correct? I can monitor the duty cycle % but cannot activate and check proper duty cycle through scanner . When I try to I get an error message of module error -unspecified.
Disconnected hoses at purge valve,Full manifold vacumn on one, nothing on other, no flow through purge valve, but scanner shows 30% duty cycle. I would think the should be a little flow at 30% Maybe my problem? Troubleshoot procedure for the EVAP would be good.
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I have a 2000 Tahoe with the 5.3L V-8, 351,000 (yes that is correct) miles. Runs great except it has recently developed a stutter, hesitation, skip, I don't really know how to describe it, under acceleration or at steady speed. This is an intermittent problem and it is driving me batty. The only codes are a P0420, maybe after 350k miles it needs replaced? Would that possibly cause this issue, or am I looking at something more sinister?
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I've only owned a 6.0 for about 10 months now. I have a 2005 SCab FX4 with 125,000 miles on it. It has an Airaid cold air intake and MBRP exhaust without a muffler, everything else is stock. The stuttering/hesitation starts at about 1500 rpm, is worst at 1600rpm and seem so to go away at 2000rpm. It also seems to hesitate when I barely press the gas pedal while driving. Based on other fuel issues with other vehicles, I would assume this is a fuel problem, but am not well versed in the 6.0 engines. Fuel filters were said to be good by the dealership about 10,000 miles ago. EGR valve was replaced last week. I'm not blowing smoke of any color, even at WOT. I was thinking an injector may be the issue, but I show no other symptoms besides the hesitation/vibration. I don't feel any lack of power when I give it full throttle. I would like to know a definitive way to diagnose the problem without going to the stealership.
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On light acceleration, it has a light stumble or surge and is very slow. On hard acceleration it makes a lot of noise, but isn't even fast enough. I can feel it shift through the gears, and can feel the converter lock up when it's supposed to. Any attempt to climb a slight hill or pass a car, it downshifts to what seems like 2 gears down, and has a loud roaring noise, but I don't feel the acceleration. At steady speed, it feels like it's hunting for a steady RPM, but can't find it.
I just had a timing belt replaced. Had the mech double check to make sure marks are correct. He did a cranking compression test and said they were all between 165-170 psi (is that a little high for a 150K mile car?). He smoke tested the intake system and found no leaks.
It does have codes stored for cat converter and a lean code-bank 1.
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I drive a 2000 Ex V10. My truck has been having an issue at idle after it warms up, almost every time after it sits and cools down.
My problem is that once the truck warms up, it will drop down to 500 rpm's and will have a hesitation/miss/lope for about 20 seconds. When it does this I can hear the exhaust making a sputtering sound. On two occasions during windy rain it would hesitate while driving but then straighten up within a half mile or so and be fine. I have changed all the boots, cop's and plugs and don't think that is where my problem is.
What I can't figure is why it seems to hesitate/lope once it warms up! This problem not related to a failing boot, plug or cop?
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I have a really weird issue with my 2003 Ford Focus. Manual transmission, just over 50,000 miles. I've been noticing a stumble or hesitation (like the engine is cutting out) at steady speed, but ONLY when it is snowy out, more if it's windy as well. I don't recall that this happens if it's rainy or foggy. All maintenance is performed as specified, to include air filter changes.
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First, a little background on my truck. 2007 with 5.4, 122000 miles, oil changes with 5-20 Motorcraft and Motorcraft filters, plugs done by dealer 40000 miles ago. The truck has developed a ticking noise, kind of like a lifter (I know these engines don't have lifters) that is most noticeable from the side of the truck near wheel. ticking speeds up with the rpm. Also around same time, between 40-55 under load there is a bit of a stumble, but I can gas thru it. I'm guessing these are related. I'm thinking spark plugs again, but shouldn't I get more than 40000 out of them? I might just take it in, since I've got oil leak somewhere around back of the oil pan, but figured maybe might get some clues first. Also, no CEL.
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I have a 2000 Excursion 7.3 4x4 with 237k miles on the original 4R100. Yesterday afternoon I went to back out of a parking space and the truck wouldn't move. When I put it in R, the transmission will engage and upon pressing the gas pedal it acts like it wants to move but will not budge. It rolls forward with no issue or noise. It will not roll backwards at all - not in neutral and not in reverse. The transmission shifts fine but with some hesitation to engage each gear. I have noticed some slippage but nothing crazy.
I 1st thought something might be wrong with the rear end but after some research I think it might be the transmission.
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I noticed difference in smoothness of gas pedal recently, I have an sct x4 tuner and it shows the short term fuel is 1.25% on idle. Does it mean rich or lean?! And what is the solution for this symptoms!
2000 5.4l xlt
Note : cold start runs fine, goes hesitant when warm, furthermore I have changed the temp. Sensor....without any difference.
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460, stock RV motor with LT headers, Alum Stealth intake. Carb is brand new, Holley 600 cfm, out of the box.
Elec choke, vac 2nds. Timing is set to 12 BTDC.
Truck idles beautifully. Drop it in drive, it will ever so slightly stumble/hesitate then go liked a raped ape. Has great acceleration (for a 8k dually crewcab). In my mind, I'm thinking a slightly larger than stock accel pump to give a bigger shot.
However, it does have a 1" carb spacer. That and the hi rise stealth, is it leaning out for a sec and causing the stumble? Would pulling that 1" spacer work? I was thinking the higher the carb the better to get less heat dissipation from the engine's heat. Replacing the heater core now. So I have some time to sort it out. I'd like to road test a tank of gas through it, but gotta fix the heater 1st.
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A couple questions I have about my truck. I'm still new to the F150.
First, my truck has an Ecoboost and I have a slight stumble/hesitation when you start the truck cold. It clears up within 10 seconds and doesn't seem to affect drivability whatsoever.
Second, it seems that only my driver side mirror has the "dimming feature" to it. Is this normal?
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2003 F150 5.4 72852 miles
I have a Rough Idle & sometimes a hesitation or stumble on acceleration. I cleaned the MAF & IAC motor & Air & Fuel Filters are new. I got a 20890 scanner & ran test 6 53 as suggested in many posts by BlueGrass. Here are My results & what They Convert to.
1 00F5 .3675
2 0051 .1215
3 0000
4 0000
5 00A3 .2445
6 0000
7 0000
8 0000
I'm guessing the cop's are ok & probably need plugs? I was hoping to just swap a coil. Too cold to do plugs & truck won't fit in my garage.
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What could cause this? I have 100k and I only notice this if in park or neutral at 1500rpms. It goes away before and after and it seems to drive very smoothly. I had a bad alternator and I just replaced it but the "new" one is making a high pitching ringing so I'm having the shop change that out for a new oem. Any chance it's the alternator or could this be something else. I have sea foamed the throttle body recently and cleaned the maf recently and changed the air filter. I didn't do plugs but they are do at 120k
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So my 20th AE has been wrecked. But here is the issue, the car will idle for a about 30 seconds to a minute but surge from 1500 rpms to around 750. But after that, it won't idle. If I let it sit for a couple of days, then it will idle for a little bit then die again.
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My 2011 stick shift no air Accent has a hesitation or stumble on light acceleration that comes and goes. It may not occur for weeks then re-occurs. It is hard to reproduce intentionally. It never occurs in cruise. The CEL is not on. Most often occurs at 1400 to 1500 rpm with slight acceleration or a slight increase in load as coming to a slight hill. I tried injector cleaner a few times and changed air filter. It seemed more reloaded to induction airflow so I changed the MAP sensor. I understand the 2011 Accent does not have a MAF sensor. It is still occurring. It is fine in steady cruise as well as in hard acceleration. I am wondering if it is a TPS sensor problem. It has 60,000 miles and otherwise runs fine.
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I have a 2004 Pontiac Montana with 90K. If the overnight temperature has been below 40ish, there is a noticeable hesitation or stumble (almost as if the engine cuts out for a second-but never actually stalls out) on the 2 to 1 downshift when braking to a stop while the vehicle is in open loop. As the engine warms up the stumble becomes less noticeable until the temp gauge reaches the 1/4 mark at which point the stumble is gone. It won't return until the following morning - the next cold start. Our mechanic has cleaned the Throttle Body and the MAF- no change. Their transmission guy said he did not think it was a tranny issue. It has no other symptoms and seems to shift normally at all other times. What to do next??
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After having my whole clutch system replaced..the truck now hesitates after 25mph shift 35, 45 and so, on it does not have a rough idle, it is like it has a hard time going then gets a burst of gas or air or will power and runs great till the next shift..,after replacing air filter, fuel filter. fuel pump & regulator, tps sensor co2 sensors and cleaning maf/map and fuel injectors, is using lots of gas too..the truck is still not happy, spent hours checking for pinched vacuum or fuel or eclectically lines.. Oddest thing, it won't throw any codes.. 1994 mazda b4000...
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I just bought my 2002 camry 9 months ago and have had it into at least 4 different shops and the last two visits were a toyota dealership. Problem, traveling at 30'- 40'mph, car has slight hesitation and slight surge feel. It feels as if passenger is messing with a driver's ed brake? Problem is sporadically intermittent. Dealership did update ECM, but not sure what they did. What to do next so my car will roll smoothly and I can love my camry?
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When I take off from a start it will intermittently stumble or hesitate, seems to be around 1500 rpm. have also noted it at higher speed while cruising. its more like a momentary power cut than a miss fire.
So far I have done the following
new fuel filters
clean MAF
new PCV valve
new spark plugs
check all hoses and plugs etc
injector clean
checked techstream for codes. there is one for a heated O2 sensor but dont think thats it.
2002. SC430
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Experiencing a low speed transmission surge or hesitation when applying first applying the gas at parking lot speeds.? I especially notice it when traveling downhill or a slight decline. The motor revs as if in neutral then the transmission catches on. I mentioned it to the dealer at the 1000 mile check up and they said they could not find anything wrong. I'm getting ready to take it in for the 5000 mile service.
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my 2006 GX has 95000 miles and recently i've noticed a slight hesitation followed by a slight surge in speed while driving at a constant speed. it almost feels like i'm pushing the accelerator then releasing it. its a very mild difference but i'm guessing tranny and have 5k left on my warranty. it occurs at a variety of different speeds but most noticeable at about 35-40mph and up around 55mph.
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