Golf IV / Jetta IV :: 2002 - Stutters / Backfires And Eventually Drops To 5 Psi At Full Boost
Sep 24, 2014
The car is an 02 gti. I am having problems at full boost(17 psi) where the car starts to stutter, backfire, and eventually drops to 5 psi. Throttle up to 15 psi is always smooth and there is no hesitation or misfires. It's chipped but I am unaware of which software as it was already on the car when purchased.
What I've done:
Checked for any leaks - none
Cleaned maf
Replaced plugs(0.028) and coils which was needed anyways
Coil harnesses look good
Fuel filter changed
I've read about the n75 but I am not experiencing any surge issues that many have described. I do believe the car is running a little rich because I can smell some fumes but it is very light. Car fires up just fine and idles smoothly.
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I have a stage 2 2002 GTI with 135k & I'm having an issue once in a while where if I go WOT the car will only boost up to about 5 (around there, don't remember) psi but if I let go and accelerate again, it'll boost normally again.
No lights or CEL comes on when it happens though. I tried searching for any info but not sure what direction to look at. I have a stock K03S, Forge DV, 3" Turboback, Short Ram Intake, FMIC. Bad N75 or DV?
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Okay I have a 2001 Vw Jetta 1.8t Wolfsberg.
I have done a few mods:
- Oil catch can
- Boost gauge
- New turbo (5000 miles old)
- Brake booster mod
- PCV system fixed and some hose deletes (that make the intake manifold have one line off of it rather than two)
- Timing belt/ pulleys
- Accessory belt / pulley
- A few other things but nothing to cause this
The car will do this randomly. And I mean once every two weeks of that. I will go to accelerate and the boost gauge says the "boost" is at zero and no matter how much I give it gas, it won't go past zero and stutters. But it stops almost as fast as it starts. I don't get it...
My catch can has 3/4" line to about 1/2" or so, that meets the oil catch can. (Ebay with the blue hose.) I have new plugs, all new (dealership recommended) lubes, all kinds of new small odds and ends. But it's never done this before. (3rd time now in a month..)
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I just replaced my my k03s with another one with only 20k on it. After I did this, I noticed a loud screech sound when in WOT. The screech lasts a little bit after i left off the gas when revving in neutral. I've been doing research on here, and I've read that it could be a boost leak somewhere or even the turbo dying. The shaft play is minimal though.
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Ever since I got my car about 5/6 months ago I noticed it's not getting full boost. when I first got it the stock boost was getting about 5-7 I don't know if that's normal I've read they normally get more. eventually I got my car tuned and it's supposed to peak at 22 psi but it only got to about 13-14 psi. slowly it's been getting worse and my car is getting 2 psi. I've had lots of people tell me it's a vacuum leak. also the bov makes a flutter noise if that has anything to do with it. my intake doesn't make a sucking in noise like most do. The car has been randomly backfiring usually between gears. I just ordered a turbo inlet pipe a breather hose kit and a boost hose kit.
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My mk4 golf 1.8t aum has intermittent boost it boosts strong then just drops off ....
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I'm running a catless dp with the "low boost" Revo stage 2 (For 95-98 octane fuel)..
I've noticed when I put in rubbish fuel, the car runs fine and can hear the turbo spooling and pssting..
When I put in Shell VPower Nitro+ (Standard UK good stuff), the check engine light comes on and performance drops. I tried REVO but they stonewalled me. Thinking of trying the higher boost map..
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Recently purchased a brand new 2013 R. With ZERO mods on it and 5,000 miles, I flashed the car to UM Stage 1. Immediately after flash I get a noise that sounds like a metal clattering in first and second gear from about 2K to full boost. Happens most audibly when the car is cold but is subtly ever present when heated up.
When the noise occurs I feel as if I'm getting half boost or a very inconsistent boost curve. The boost then kicks in after the 3,500k(ish) threshold. On rare occasions, the car will warm up and run exactly as I would expect it too. 1st, 2nd, 3rd all boost very evenly and strong from 0k and beyond with no noise and the car is amazing to drive.
To try and diagnose the issue, I flashed it back to stock and the noise disappears though I can still feel it not boosting consistently. I took it to the dealer (stock) and they said the didn't notice or couldn't hear anything which was what I expected. I'm guessing it is something the with wastegate but I don't know enough to say with any confidence.
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I installed a VF intake a few weeks back and noticed my car is peaking at around 14-15 PSI max according to my boost gauge, when it used to hit 17 peak. I'm not sure if I may have a leak nor have I checked it via vag-com.
It does feel a bit off, but for as far as I know the gauge could be messed up now.
Just wondering if there would be any immediate signs (sounds etc...) of whether there would be a leak, or what other problems may cause this.
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Ok here is my question. I've noticed the power on my car has felt inconsistant for the last little while. I finally got around to logging the car and my boost peaks at mid 20's just over 3000 RPM and then drops fast to between 13-15 psi before I even get to 5000 RPM.
Under full boost I hear a low fluttering sound like the diverter valve opening and closing when this is happening. I also don't get the typical diverter valve sound when shifting when the car is doing this.
I took my diverter valve out and inspected it. I can pushing the piston up very easily with almost no resistance, is that normal? I would think that it should be hard to push the piston up if not wouldn't boost pressure be able to overcome the piston and leak past?
My mods are. HPA tune, HPA catted down pipe, and VWR intake.
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I replaced the coilpack from the dealer last Summer. It got better as it wouldn't even start for a while after it finished raining. However it has still been finicky even after replacing it. Which brings me to the realization that water runs down the fender panel and ends up on the ground cable located under and to the right of the battery. Am I correct that this would cause the same symptom as a bad coil pack? It seems simple...move the cable right? However should water be doing that? Cause this little sucker is not stopping anything. Just need validation I guess...get new hood insert?
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'01 A6 2.7T 95k....Not boosting as high as normal...the check engine light came on the other day, P1136 code said engine was running lean. I found a small vacuum hose leak near wastegate and fixed it today (CEL is still on though). Stock boost is normally around 8-9 psi, but I am only getting 6-7 psi. Also, the boost seems to climb more slowly than it has been, and it occasionally goes into limp mode (only 3-4 psi). The turbos were replaced about a year ago with all new blue hoses. There aren't any other symptoms, no weird noises.
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I have a MK4 2.0L 8v 5 speed and recently I started making trips out to the country that last a bout 25 minutes one way and I usually drive pretty spirited the whole way.
I recently noticed that after each trip my coolant reservoir drops significantly, about 1/2" or 3/4". The oil level never changes and the engine never passes 90C on the gauge.
The outside temperature is about -10C most of the time and I always have it at operating temps before I really get into it.
I can't decide if this is normal because the engine isn't overheating (as far as the gauge says) or a problem because it's using a lot of coolant. I've never been to a track with this or any other car so I'm not sure about the effects from hard driving.
The engine revs to 6.2k RPM and I never go over 5k.
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my car into VAG COM and since then it hasn't boosted past 4 lbs. it has Revo stg 2, K04, aftermarket side mount, full exhaust and a couple other bolt ons. Before the car was spiking at around 23/24 lbs. after pressure testing the system I found that the turbo inlet pipe was lose, so I tightened it. Still no change. I tried holding the battery terminals together for 10 minutes to reset the ecu and I also tried clearing the codes through a handheld code reader. No codes even come up anyways for this. The car is a 1.8T.
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I have a 98 passat b5 turbo. All done to it is k&n filter and exhaust.... I put a boost gauge on it and i only get 3-4 psi... is this normal? it sounds very low. Also a weird thing is that the boost drops off at high rpm.
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My GTI has started to bog out, i guess is the best way to describe... As I am trying to accelerate on the highway my RPMs rev up to 5000 till I get any response to amount of gas I am giving. It will dramatically drop to 3000 without letting off the gas. then gradually will accelerate, untypical to way it use to perform. She respond this way cold or hot.
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So my 2001 1.8t Golf is having some issues holding boost. I have a Gonzo stage 2 tune, CTS FMIC, Forge 008 Diverter, Silicone inlet and MagnaFlow Exhaust. I've also done the whole Evap, SAI delete and installed a catch can.
Starting in 2nd or 3rd at WOT the car spikes up to 18psi and then progressively loses boost throughout the rev range. Close to redline the boost drops to 5 psi or so. It seems to be dependent on the revs. In fifth gear the car holds 18 psi much longer as the revs don't increase as fast.
There are no CELs. I've done multiple leak tests starting at the air box and plugging the pcv/catch can system as well as at the compressor side of the turbo. None of the tests revealed a leak anywhere in the intake system. However, when I stuck my ear very close to the valve cover I could hear what sounded like a very small air leak coming from inside the valve cover. I took a look at the wastegate actuator and it seemed fine, no play in the rod, no loose bolts and to move it just requires enough force to compress the spring and it returned to its original position.
My thoughts are that it could be a fueling issue or turbo in the process of dying maybe.
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Just noticed today that I have a slight drop in boost. Normal boost is 1.5 bar but today it is running slightly lower boost and does not have the same pull through all the gears.
2001 mk4 1.9 tdi golf
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I just recently notice a whistling noise when I hit boost. I'm not sure but it sounds like it is coming from my gauge. I'm not losing boost pressure. I do have a glow shift gauge. The most recent install was the TIP which I clamped on to the turbo but I'm wondering if it isn't on tight enough.
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I was riding along today everything running fine then I came to a stop sign and when I pulled off my car wouldn't run 10 psi of boost it was only running 5 psi so I when to a buddys checked everything over and all my piping looked fine so I went up the road and everything was fine so when I started going home it did the same thing pulled of shut the car off pulled off and it was fine again.
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I think my stock DV is going bad, my car makes a weird noise under boost?
1. Only happens when first starting the car after it has been sitting for an hour or a few. (not overnight)
2. Does NOT happen when first start in morning.
3. Goes away after like 5 minutes every time and the normal WHIIISHH sound comes back like it should when I step on the gas.
4. It does not make the sound at idle.
This recording I made was of my car being revved up after it sat for one hour.
[URL] ...
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