Bad misfire..

[Horney]

Cheap leads seem to be a real a problem on these. I bought a set and it missfired all the time.

Got some from VW and it purred like a cat.

Nick

[Stuad70]

Well I'll be damned - just joined up to find out some info on this problem having bought Mk3 8v over Xmas.

So far new coil and plugs have improved things slightly ( i.e. car now driveable ). .

ECU Also Reset by Local VW Specialist..

Def up for new dizzy cap from GSF ( part number anyone ? ) and some VW leads.

Actually found using some injector cleaner smoothed out the problem but the car lacks any power on full throttle ( still able to zip away at half throtlle but want more )..

Intrigued to learn more about the DIY Maf clean up - any pictures any one ?

Cheers

Hope to help in future with advice and articles and will probably get the camera out 2m to show pictures of the MAF..

Cheers

[Mr_G]

Hi,

I have a problem with my mk3 Gti 2.0 8 valve Golf that sounds similar: When I'm on the motorway (and pretty much anywhere else when I can get over 50 mph) and I'm on part throttle (not quite on the over-run, not accelerating, just cruising really) the car seems to stutter. All of a sudden for a split second it's as if the engine cuts out and you get a jolt through the car and then it's fine again. It doesn't seem to do it when accelerating or braking and it doesn't do it when cold. The gauges don't die and the stutter is really quick, over in a flash. It doesn't feel like a fuel problem i.e. no loss in power (apart from during the split second), no missing or popping - but obviously I can't be sure.

I've replaced the plugs and coil and fairly recently the water temp sensor, before I spend more cash on the leads, cap and rotor arms does anybody have and ideas as to what could be causing the problem?

All suggestions gratefully received!!

I have same issue and the maf plu is dangling on the side unplugged ( I have piper induction kit on) so that is not the answer for me as reported by mosdef....

I am wondering since my mechanic said I should get the original airbox and try it maybe it would fix it but after reading these replies I am a lil more confused to what really is the cause, since the solutions are seemingly mixed....

I will allso try to clean the injectors maybe the flow of fuel is restricted when the beast needs it...

is there a way to have a induction kit and the maf plugged in?

[Jogort]

Mr G, I have a 97 Gti 8v with a piper induction kit and the kit has a hole for fitting the maf into. I think it depends if you have the Bosch or Siemens/Hitachi one. I think that is the part you are talking about, as i don't have anything left dangling out.

The rubber part near the actual filter.

[Mr_G]

Ah yest thats the plug I meant. Soorry if thats caused misunderstanding.

I actually have A K&N now cause I found out the previous owner was a total numpty and installed the wrong filter on I think it was for a ford what he had there. (bad job too)

I have now bought the sensor (£23 from VW) Which I understand is the MAF or What I call the Air temperature sensor and have the Lot Plugged in. Still However I experience the same both will Hesitate at 3000RPM and not make it past 5000RPM, however this is not allways the case since every now and then 1 time out of 50 will actully run fine.....

I have seen some mates that know more about this then me and they have told me that theres a chance its the ECU, so Im having that looked next week on the 8th.

I have swapped all parts mentioned here like Dizzy cap, rotor arm, Leads (I have Magnecor super doper set on) and spark plugs (Splitfire)
Timing is fine also and now I recon its down to the Mate thats coming down with his lappy and the Vag.com soft and maybe even look at remapping it.

I will post what the findings are.

Also The Catalyst Converter Stinks of Sulfur sometimes So I recon I have to fix the main issue b4 I move on to that....

If All Fails I am considering a full engine rebuild or a 16V engine swap whatever is cheaper. But thats just Silly.

Please leave your thoughts....

Laters

[Jogort]

From what i've read on here the hesitation at 3000rpm is very common on the 8valve and that there is also some sort of restriction to stop going over 5000rpm which most folks remove, i dunno how as mine seems to be done anyway.

[Mr_G]

A restriction you say, if that were the case the car would never ever go past it, which is not the case it is unfortunate it doesnt goe past 5000rpm every time...

I have no restrictor on the rotor arm either.

I will have to wait until the 8th (next week) so \i get a better idea what the ECU is telling  the engine.

Im keeping my fingers crossed.

[A.K47]

hi, iv got a mk2 gti 8v and having similar problem as most of u guys. Car runs fine through 1-3 gear, but in 4th and 5th the car (i guess) is misfiring/juddering and have no power at all. litterally cant get over 70mph. iv changed leads, cap, plugs, air filter and oil filter but still the same. whilst it does this misfiring my headlights will flicker (when on) and just to add to this iv had a mass of white smoke pouring out when i have managed to get it goin over 5000rpm at which point i lose all power till i let off the throttle and all is fine again. Somebody help!!!!

[BMWLOVE100]

thanks