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General => The garage => Topic started by: GTIMKiiJODE on 24 February 2004, 13:53

Title: GTI 8v MISFIRE WHEN COLD
Post by: GTIMKiiJODE on 24 February 2004, 13:53

My mk2 has got a bad misfire when engine cold. Clears within 2 mins of starting. Put new dizzy cap leads and plugs on. Sorted problem out for two weeks and now it has started again. Any ideas would be much appreciated

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: golfvr6 on 24 February 2004, 14:08

If its a k-jet then maybe a worn worm up regulator.

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: GTIMKiiJODE on 24 February 2004, 20:01

Dignifant 2 not K-jet. thanks anyway

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: golfvr6 on 24 February 2004, 20:29

try changing the coolant temp sender.

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: GTIMKiiJODE on 24 February 2004, 21:48

Don't think that will help much. Think it is more electrical ignition fault. The engine is warming up fine, just misfiring when engine is cold in mornings.

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: mk1 on 24 February 2004, 21:55

Are you sure that the missfire is electrical, as vr6 said it could be a fueling problem. Unusual to replace the dist cap, ht leads and the plugs and not the rotor arm, try a new rotor on as the worn rotor will have worn giving you a big air gap.

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: GTIMKiiJODE on 25 February 2004, 10:47

Changed rotar arm aswell. VR6 maybe right. Probably not electrical fault. I am not brilliant with engines. Going to check coolant temp sender - the one that talks to the ecu right. Fingers crossed.

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: Veedubgt18v on 25 February 2004, 18:43

Quote from: golfvr6 on 24 February 2004, 20:29

try changing the coolant temp sender.

this is well worth checking, if its wrong you can idle bad and generally run crud, they arent expensive so prob worth changing anyway!

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: GTIMKiiJODE on 27 February 2004, 16:47

Changed coolent temp sender, made no difference. Took it in to VW garage, they reckon it is the fuel pressure regulater. Apparently fuel pressure should be around 4bar but they tell me mine is running at 7 bar which is far to high, Hence to much fuel being pumped in so engine struggling when really cold. Ordered pressure regulator - ?55 squid. Hope they are right.  ???

Title: Re:GTI 8v MISFIRE WHEN COLD
Post by: GTIMKiiJODE on 04 March 2004, 23:02

Yeap they were right - fuel pressure regulator. Running really well again. love it