Golf IV / Jetta IV :: 2001 - Stutter / Misfire On Acceleration
May 27, 2014
Situation 01 Jetta AEG 2.0L codes catalyst below threshold and random misfires.
•found exhaust clogged due up catalyst. It was actually making contact with the rear O2
-replaced cat as an assembly and reset codes with Ross-tech
• start up, idles perfect no hesitation smooth. Road tested it and upon entering freeway ramp at it started stuttering/misfiring
• CEL flashed for cylinder 3 & 4. Inspected wires found #3 lost continuity, installed new wires.
•road tested and same result but only 4 came back. Swap plug with #2 and retested.
• #3 and 4 misfire came back again
- shooting in the dark to identify which way to go with it I tested:
•compression was solid 140
•fuel pressure 35 psi at idle and 45 when snapping the throttle.
-Suspicious spec is 55-72psi
•squeezed the return line to inspect if the Fuel pressure regulator valve possibly leaking excess.
Psi never went higher than 45 at idle and throttle snap to wot
•graphed the tps signal smooth with out drops or glitches up to values of 84 according to toss tech scan tool
•looking at measiring blocks one item that was odd is engine load at idle 99.5%
-swapped parts with known good parts with a good running 2002 Jetta aeg motor.
•MAF -no change
•ignition control module/ coil pack no change
-today ill be checking fuel pressure at the fuel pump and inspect if the fuel filter possibly clogged.
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I have a 04.5 GLI 1.8t, performance mods include, cone filter on the end of my maf, silicone TIP, Forge splitter, 3in custom tbe and unitronics stage 2
I started noticing this problem on the day I got the car tuned, I hadn't noticed it before hand. I replaced the spark plugs and it worked a little, but it continues to do it.
The problem: When I get on it at WOT under full boost, around 2500 rpms, the car loses all torque, misfires spits and sputters throughout the rpm range until about 5300 rpms then it all of a sudden has torque and pulls great.
I don't have any boost leaks that I know of along with vaccum leaks. There is no flashing cel or misfire code for my coil packs. Can this be a faulty n75 valve? if so what could fix it?
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06 250 5.4 40k on it, usually when cold and accelerating engine will misfire and stutter and then continue accelerating. The wrench light will flash sometimes but it wont store a code. This used to be vague in occurrence but has now started to be more a common occurrence even when up to normal operating temps.It seems only to misfire /stutter on hard acceleration or towing/hauling heavy loads. The only answer I got from a mech would be to do a computer reflash, not sure why /how this would fix whats going on.
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2002 AVH Jetta Wagon. When I got the car back in 2012 it had 121K and I changed the wires (ngk blue 57021) and plugs (ngk platinum) and she drove like a dream. A couple of months later I started having issues with wet weather and moisture causing misfires so I did the JB WELD fix and though I'd still get the occasional misfire in hard rains it lasted me pretty much until very recently, when I decided I needed to put in a new coil because the problem was getting worse (hardly starting up after a rain and bucking wildly till things dried out). Yesterday, I replaced the BERU with a new HUCO and the car started up fine and drove fine all day. I think there was a lot of moisture in the air last night and possibly some rain but this morning, SAME PROBLEM with a new coil. Misfiring like crazy, no acceleration.
I thought the NGK wires and plugs I got were rated to last beyond 20,000 miles. At this point should I assume the wires are to blame? Split somewhere or something? It's definitely related to water and the electrical system.
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2001 V6 Passat with 125k miles throwing a P0430 code.
Having trouble on cold starts, takes about 10 minutes to finally get it to turn over. When it does the idle is extremely rough. For the first 1/4 mile the car bucks, stutters, and misfires. After that it runs fine and starts fine when already warm. I am noticing slightly decreased gas mileage but nothing major.
Valve cover gaskets were replaced 2 months ago, but were leaking oil for at least a year before I could afford to have them replaced. I am still noticing some oil leakage, however not as much as before. I have had both O2 sensors replaced twice in the past 5 years. Timing belt was replaced at 98k. What might be causing the starting issues?
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I have noticed a slight stutter in the acceleration when pushing it hard. Seems to be most noticeable 4th gear around 4500-5500 rpm. Is that because I dont have a HPFP? I also notice the fluttery whistle sound that was discussed at length in another thread...doesn't bother me one bit but it seems to coincide the stuttery acceleration. Also, I noticed it upon the very first drive after getting flashed - currently at 2500km.
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New to the VW world but I am not out of my element for I am a Porsche guy. So I feel right at home. Last night I picked up a 2001 wolfy Jetta with a 1.8t on the cheap with a misfire on cylinder 4.
I have verified I have no spark on 4. I have confirmed the issue is not the spark plug, coil pack by swap and see method. My coil pack and plug work fine on another cylinder. I reset my cels and here are the new ones that pop up:
a 121 - gas pedal position sensor- doubt this would give me a no spark
a 304- Misfire on 4, (duh, like I needed to hear that)
a 030- bank one 02 -Doubt this would also give me a no spark condition)
In my testing:
I have good system voltage on the coil pack
I have good ground ohms
My signal wire is not shorted high or low
When I take V and ohm readings on the coil pack connection, either with the ign on or off they are all in line with the other sensors. So I don't think I have a wire issue.
The PO had the ECU replaced at a local dealer. I looked at the old ECU and it appears it had got wet at one point.
Im wondering if the same thing hasn't happened to the new one. however after they replaced the ECU they gave him the car back still broken. So it never ran even with the new ECU.
1 Where is the ECU?
2 What tells the ECU to fire the coil packs at the right time?
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I recently changed my spark plugs + coil packs in my 01 1.8T because it read a couple cylinder misfire codes. Drove it for a few days out of curiosity plugged the code reader in again and it's still reading misfire codes. What could the issue be still?
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I bought a 2001 golf gls 1.8T (AWW) about a month ago and it was running pretty bad, was throwing some codes, cylinder 1 misfire and some o2 sensor codes, I replaced the coil packs and spark plugs and then cleaned the MAF. It was still running bad ,rough idle and power loss. I figured it had to be some kind of vacuum leak, I replaced the PCV valve, cleaned the intercooler and put on a silicon TIP. Still had some rough idle and power loss, checked for vacuum leaks, using the good ole starter fluid method and found my intake manifold was leaking so I replaced that gasket. STILL rough idle and power loss, now I'm pulling codes for o2 sensor and a misfire in cylinder 3. My question is, should I replace my pre-cat o2 sensor or replace my MAF sensor? Or are there other things that should also be checked/replace.
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So my girlfriends's 2001 2.0 Golf (engine code AVH, 153k miles) began throwing codes for misfire on cylinder 4 and for the o2 sensor (post-cat) recently. I went ahead and replaced the spark plugs, wireset, and the coil pack. They were way overdue. The CEL went away for like 30 miles, and then came back. Now it's reading misfire on cylinder 3 and the same thing for the o2 sensor. What else it could be? Search is coming up blank, most people replaced the coil pack and the CEL went away.
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I have a problem I can't seem to figure out. My car has a misfire at idle. It has stumbled every once in a while at idle before while at Red lights. Now it does it all the time. Check engine light is on and I got 5 codes. P0300, p0301, p0302, p0303, p0340, and p0012. The last two are for cam position sensor. I took it outo and looked at it. Looks fine. I reinstalled it and hand cranked the motor with a meter hooked up and I am reading about 10 volts when it senses the metal ring going around. So I think that is good. I sprayed brake cleaner on all the hoses to see if the motor reved to hopefully find a vacuum leak. Nothing. I also noticed today that my cooling fans or my ac don't work. Now I have another issue to deal with. I checked all my plugs and wiring and coils also.
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My 01 gti VR6 just started shaking pretty hard under acceleration on the front end. I'm guessing I snapped something or loosened something on launch. It was running fine on the way to the hardware store. Then I took off quickly because of oncoming traffic and suddenly it started shaking on the whole front end. I can feel it and see it from the wheel to the dashboard. It happens around 30 Mph. I picked up the car put it on jack stands and when the load is off the tires it doesn't seem to shake. Being that it happened so suddenly I am not leaning towards a bent rim or alignment. I don't see much wear to the dog mount underneath and the engine doesn't seem to rock much when revving or putting in gear so I'm not thinking much for broken engine mounts.
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I drive a 2001 Jetta with the 2.8 v6 with ~125k miles
So for a while my car was giving me a false read on my temperature so I replaced the sensor. I actually followed instructions from a thread on this site. [URL] ....
Now when I go to drive my car, it runs sluggish and misfires if I really give it some gas. CEL is on(however does not return a code when hooked to a computer), and flashes when gassed hard.
I've checked to make sure spark plug wires were reconnected correctly and securely. No leaking has occurred from the temp sensor. shift rod drive unit is reconnected correctly.
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My '01 VR6 GTI with new struts, A-arms, ball joints, wheel bearings, tie-rods and ends, etc. has started to get a shimmy through the steering only under acceleration. Half-shafts?
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So last Thursday I started my car up in the blistering cold and it ran fine for about a minute and started to misfire so I shut it off. It hasn't ran since. When that happened the check engine light was blinking because of the misfire. I didn't have a code reader at the time to read it. now that I got a code reader the damn thing isn't throwing any codes. it spits and sputters sometimes. I've had no previous problems with the car. Thinking It might be a weak fuel pump or bad coils and in not sure how to test them.
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My 1.8 is having a stutter/hesitation in first gear when I first start driving. No cel besides a misfire in cylinder 1 that I got yesterday afternoon. The hesitation began well before that though. Researched the topic but could not find similar issues.
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Replaced my coil packs/sparks, and just got around to changing my N75 valve today. The rough idle issue is gone but now when I go WOT it boosts but goes from 15psi-12-13-12-14-12...etc. I've checked and there are no boost leaks. I do have a CEL saying I need a new bank 1 sensor 1 Oxygen sensor. If it is that, why did this problem arise as soon as I changed the N75 valve and wasn't present earlier?
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I have an 01, early model, AWD Passat wagon, v6, GLX and when I accelerate from a standstill or a slower speed, the car hesitates slightly and coughs(?) and then catches on and accelerate. It doesn't actually backfire or misfire.
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My car is misfiring, as in acceleration 90% sputters until I lay the pedal to the ground, which obviously isn't good for my gas. What do I do? I can't find anything online and I don't want to be throwing money into things that don't work.
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Ever since I've gone APR Stage 2+ (most recent revision) I think I've been experiencing a misfire when acceleration at wot- I've had the tune for quite a while now. Typically I get pop out of the exhaust in 4th gear around 5,300rpm but today I experienced it in 3rd gear same rpm but it popped 3 times in a row.
Performance mods include: HPA TBE w/ 100 cell high flow cat, APR Tune, APR HPFP, Evoms Intake, R8 coil packs and upgraded spark plugs.
What could be causing this? I've read all of the past articles and it seemed the upgraded coil packs and spark plugs would do the trick but it hasn't.
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B5.5 2001. When I am giving her gas you feel her stutter. But its not like a misfire stutter. Its more like a lose of power. Its almost like shes switching from boast to naturally aspirated. These stutters can also last a few seconds at a time. Where to start looking?
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