Golf IV / Jetta IV :: Rough Idle / Backfiring And Bogging Down When Driving
Nov 4, 2014
To start I drive a mliv 1.8t jetta. The car has a stage II custom tune, a turbo back exhaust straight piped, and a splitter valve. The valve cover gasket, spark plugs and coil packs, rear o2 sensor (with a 42dd spacer as well) were all changed recently to try and stop my problems from reoccurring. Also the MAF sensor was cleaned too, but was not very dirty. The problem tends to cease when I delete the codes and it has to relearn the fuel mapping. When the check engine light comes back on, the problems re occur. The code thrown is catalytic converter below threshold, but i have no cats. What happens with my car is, when the car is fully warmed, the car has a rough idle, to where it sounds like a heavy duty diesel truck when idling, the car will shake from the vibrations, when i go to start moving, the car bogs down to where it feels like it will stall, but it will buck and shoot off. Also when driving the car randomly bogs down, but then will shoot off will power! Sometimes at idle when its bad, if i tap the gas, the car will back fire very loudly.
View 3 Replies
Advertisement
I have a 98 with the 4.2.The troubles started with popping a little through the exhaust ,bogging down and bucking,rough idle and had the two codes together that deal with having bad intake gaskets don't remember the codes offhand.
I also noticed every plug in the truck was wet and black however it didn't appear oil wet.I have changed the fuel filter,spark plugs,lower intake gaskets,plenum gasket ,injector o rings,checked injector ohms all were 16.5,new EGR gaskets,all bolts are torqued to specs
Now I have a no run condition, it will crank but not run. I heard a pop in the engine one time. I cranked till the battery went dead.I also noticed as I was calling it a day last night the radiator reservoir was empty. I don't know if somehow I got a hydro lock even though I put new intake gaskets in it or i have some other issue like timing or something. I don't know where to look next....
View 6 Replies
My car is stored outside rather than in a garage in winter. I do notice bogging or "gargled" acceleration maybe 4/10 on occasional days and sometimes the engine light will come once this happens and then other times it doesn't come on when it occurs. Engine light usually comes on rarely but when it does, it's when the bogging is really bad.
Question is what would be the most cost effective way to solve or find out what the issue is? And/ or, what would you think the underlying issue would be for starters? Also, does my year car have a MAF sensor? BTW the cabin filter and air filter were just changed a few months ago but unsure if this would include the shop cleaning the MAF if I do in fact have one.
View 14 Replies
I have a 2001 vw jetta 2.0 and I was accelerating on the interstate the other day and the car just started bogging down and now the car only accelerates slowly at partial throttle any more and it makes a loud intake noise and bogs down also the car idles bad and even at partial throttle the car struggles to get above 3k rpm, I scan for codes and got MAF, O2 sensor before the cat and camshaft position sensor, I replaced the camshaft position sensor and car still runs like crap, what is the problem??
View 4 Replies
I have a 2000 Jetta VR6 12v. I'm having an issue with backfiring. Also, I am having a severe issue with bucking. Sometimes it will not happen at all, and when it does happen it can occur from 2300-5500 RPMs. No matter how hard or soft I am on the throttle, it will hit this point, different everytime, and the throttle will cut out, then pick up, then cut out, then pick up.
Now, I know my MAF is throwing a few codes. But it was throwing codes for a month before this started, maybe longer,and the only symptoms were backfiring and a little lag at startup. However, the same night my issue began, I also developed a coolant leak. Upon inspection, the coolant leak path was traveling directly over my CKP sensor where it connects to the engine block, which also began throwing a code. The car starts fine, idles fine, and never stalls or dies. So my options here are replace the MAF if that seems likely to be the issue, or to attempt using liquid electrical tape to prevent the leak from hitting my CKP sensor.
View 17 Replies
My golf 2.0 vw isn't doing so good right now. It has 227000 miles on it. It has been driving great, and then last week it started to idle rough. It idles between 600-800 rpms. it fluctuates between 600-800 rpms. It had the check engine light on before this happened i was told by my brother that it was an 02 sensor. I had it checked for what is causing the engine light to come on today at o Rileys, and it came up with 11 codes. Some of the codes where 02 sensors, it was running to rich, needed a new computer, evaps system, fuel pump, fuses, coil pack, spark plugs, It shakes when you sit in it when it is idling like not a bad shake but a small one you cal feel, l'm including a video of it running.
View 6 Replies
After putting on a o2 spacer my CEL cleared. I finally got some downtime so I parked the car in the garage to chase electrical gremlins, do the timing belt, and replace the downpipe and catalytic converter. Lately it's been sounding like I have quite the exhaust leak so that spurred me into doing a little quicker. Long story short I got the cat out and after looking inside of it I see this .
The inside of the cat is completely bare, not even a remnant of any form of honeycomb. So was this a hollowed out cat or did everything deteriorate and blowout. I was assuming my cat was clogged because of my rough idle lately... but looks like I was dead wrong.
Now for additional info.
2001 Jetta 2.0 AEG 220K miles
Previously had a CEL for the catylst below threshold
I can't currently check my codes because the OBD2 isn't reading/connecting, but that's not related.
View 1 Replies
The problems seems to be getting progressively worse, it has a rough idle and when it smooths out is only at about 600 rpms and still sounds strange. Also, I am running extremely rich, blows flames quite often and in OCMD I went 100 miles on a half tank. Car is stage 1 unitonic with sai and evap deleted. I changed the maf and that didn't change anything. I was searching for vacuum leaks yesterday and noticed that one of the vacuum caps I have on the bottom of the intake manifold was dried out so I took it off so i could put my finger over it and see if it ran better, when the cap was off it ran great but when I put my finger over it it would go back to an awful idle Now when I come to a stop it will sometimes drop the rpm so low that it shuts off, when I am driving you can't tell a difference.
View 1 Replies
2002.5 VW Jetta GLI VR6 24V 6-Speed. Barely accepts a small can of Freon from full empty, and pressure goes to over 100 psi in the red, compressor does not kick in, idle fluctuates with A/C button on, small fan kicks on fine, some air pump turns on and off with the erratic idle and sounds like shot of compressed air. When I turn the A/C button off, idle comes back to normal and that psss sound is gone. I already changed compressors and that made no difference. Video below.....
View 5 Replies
2005 gti 1.8t having really rough idle and misfires at idle fine while driving pulling codes:
P0300
P0301
P0302
P0304
Unplugged MAF and didn't make a difference...
View 6 Replies
the last couple weeks the engine has been running poorly, rough idle .... and sputters until about 4k rpm with a noticeable loss in power. No clue what it is ... it seems to spring up after I got a coolant hose leak on top of the motor.
View 2 Replies
I have a 2003 2.0 gas Jetta (181k miles, automatic.) that won't rev over 3k, starts rough, idles rough and wont stop setting a P0341 cam position sensor code.
The car was not running when I got it, I replaced the coil pack and it ran but not over 3k. Cleared codes, it sets the P0341 immediately.
Had timing belt, water pump, tensioner and cam pos sensor replaced. Still, sets p0341 code, starts rough, idles rough and wont rev over 3k.
The throttle servo makes a little noise when actuated, shop thinks this is my demon - suggests replace throttle body. This car is for my son who will be taking it to college soon.
View 3 Replies
I have a 2000 jetta 2.0, and the idle seems to rough and when I start the car it seems like I might stall.
View 9 Replies
When I first start me car up, doesn't matter the outdoor temperature it idles terrible jumping up and down. When I go to put it in first gear and attempt to pull out it's very jumpy/jerky because of this rough idle. Once I drive a little bit if I stop it will idle fine. This problem seems be slightly worse when it's wet/raining/humid.
Its throwing codes P1128 Manf Control p0300 multiple misfires and then p0301,0302,0303,0304 which is misfire for that individual cylinder. Also my oil light blinks once in awhile, think that could possible be sep issue though.
I changed plugs, the old ones were really white... I believe that means running lean?
Put in new coil/wires
Gas Filter
Mass air flow sensor
Changed 02 sensors
Also did the seafoam treatment, none of it seemed to work...
Though about possibly changing temp sensor next. I hope it has nothing to do with fuel injectors....
2000 Jetta 2.0l 4cy AEGengine
View 2 Replies
I'm having a little issue with my 03' vr6. I've had the car for almost 2 months now, which it's pretty new to me, since about the time I got it, the car would sometime roughly idle on start, just for a few seconds, maybe for 10-15 seconds, and then it'll go back to idling at 600-800 rpm and being normal.
This has happened maybe 5 times since I've owned the car, and since then I've changed the battery, and cleaned my MAF. The other day when I started my car it (the rough idle on start) lasted for maybe 30 seconds, so it kinda scared me a bit.
Also there is no check engine light. Other than the weird idle on start, the car feels responsive, quick and there doesn't seem to be lack of power. This is the only mk4 gti I've driven fast in, so there may be lack of power and I just don't know it.
View 2 Replies
I have an 03 vr6. I'm getting codes p0300, 0303, and 0304. I changed the plugs and the coils and still has changed nothing. In the morning when I first go to start the car it has a rough start and idles rough. But after letting it warm up it is fine. It drives perfectly fine, no misfires. None of this started happening until the car ran hot a few weeks ago. Did a compression test and everything came up fine. So would could my issue be? I'm at a loss here. I was thinking fuel issue but if it was a fuel issue, wouldn't it run rough all the time?
View 15 Replies
Just bought a 2.0l 2001 golf four door. the previous owner had the car for only a short time. They claimed the CEL came on and the code was for the MAF. He cleaned it and when I test drove the car there was no light or sign of any issues with how the car ran. Today while figuring out why the alarm kept going off(battery died in key fob and i replaced them), it began idling rough. It had just started to rain as well. From what i could find from older thread is it could still be the MAF, TCV/ISV, or O2 sensor. Is there any good way to diagnose without a vag-com cable. Mine wont update its firmware and i'm screwed at the moment in terms of gathering info on the problem.
View 9 Replies
I have a 01 vw bora 1.8t and recently I let it sit for one day and now it has trouble starting when it's cold and when it does start it has a very rough idle and often stalls out of you try and press the gas. Once it has warmed up she runs fine. My check engine light is on but I have no way to take her down to a shop to get the codes read. What is wrong with my car? One of my friends told me it could be a cool pack or a sensor.
View 1 Replies
So this morning when I started my car to warm up everything was fine. I went inside to make some coffee and I heard my idle change slightly and didn't think to much about it but when I got in I could feel my car shaking a little bit then when I pulled off my road there was a little hesitation in first gear taking off and when I would shift I would get a little rev hang between gears. So I've realized when idling its slightly fluctuating between 6-7 hundred rpm. I have no loss of power and it has not hesitated since the first take off. I'm thinking its something to deal with air. I checked my airbox and realized the bolt closest to the battery wasn't threaded so I fixed that and tried looking for any leaks but haven't found anything.
View 4 Replies
02 Jetta GLS ... 1.8 Liter Turbo ... 5 speed manual
Threw a lot of codes I don't know the #s but I can get them tomorrow, but I know there was a throttle pedal sensor, cam sensor, MAF, turbo, and a computer one.
I've had the car 2 weeks and its driven fine every day until today I backed out of my drive way after doing some driving earlier in the day and popped it into first and she fell on her face, no power rpm's were near 300. shut it off start it back up idles a little rough and I have a traction control light CEL and EPC lights all on. when I first take off it chugs and is hard to even get going and then it takes miles to get up to speed. I can put the pedal to the metal and my rpms barely budge and the car ever so slowly gains speed, she eventually will top out around 70. but that's after quite a stretch.
This happened one other time and after a few minutes everything went back to normal for nearly a week , this time no such luck.
Possibilities to shoot down maybe?
-fuel filter/system
-Cat. converter
-MAF sensor
-Coil packs
-computer something??
-throttle body
-turbo
-electrical
View 10 Replies
I am having a problem with my car today. When I started it today while going home from work I noticed that it's idling a bit rough. Then i noticed that the pressure is going under -0.8 bar. Golf 4 1.8t boost going under 20 hg at idle. While driving it is normal but when i slow down it hesitates like it's gonna turn off and the pressure goes less than -1 bar .. What the problem may be ?
View 4 Replies
