miss fire

[C3 LJG 0]

My vr has been off the road for the last 2 months over the winter, as the weather is good i taxed it and went to use it today, started and ran fine so when to put some petrol in and took a drive up the motorway to blow the cobwebs away, get a few miles up the road and the car starts miss firing really badly!

Limped to my parents house and took the plugs out and they seemed fine (they where new about 6 months ago and have only done about 3000 miles.) Put back in still miss firing, so we put a timing strobe on each lead just to see if they where sparking evenly, and it looks like the 2 leads on the top left of the engine and middle as you look at it aren't firing at the same sort of rate as the rest . I know its not the most acurate way of testing!!

Is there a way of testing the coilpack and leads?

The car feels similar to when i had a coilpack go on my last car 20vt so think it may well be that but would like to know if there is ways of testing the rest of the system?

Thanks

Luke

[stockers 1]

mine mis-fired when 1 of the leads was knackered, although i dont know why yours would do this if it had been unused for 2 months, i guess the easiest way is get another set of leads on the bay ,or borrow a friends and test each one in turn, if youre near st albans get in touch as i have a some leads we can test yours with.

adam

[C3 LJG 0]

Thanks for the offer mate but no where near you unfortunately!

Took the coil pack apart today and its quite rusty around the coils and one side sticks out about 1/2mm where as the otherside is flush and looks likeits been taken aprt before as the plastic tabs have been broken. I think its still the original one as its stamped up '97 which is the same year as the car.

[C3 LJG 0]

Vag-com'd the car just now and got this

Address 01: Engine Labels: 021-906-256.LBL

Part No: 021 906 256

Component: MOTRONIC M3.8.1 HS V04

Coding: 00000

Shop #: WSC 01317

3 Faults Found:

00668 - Supply Voltage Terminal 30

07-10 - Signal too Low - Intermittent

01247 - Activated Charcoal Filter (EVAP) System Solenoid Valve 1 (N80)

37-10 - Faulty - Intermittent

00533 - Idle Speed Regulation

14-00 - Adaptation Limit (Add) Exceeded

Readiness: N/A

cleared the codes and ran it up again and got

Address 01: Engine Labels: 021-906-256.LBL

Part No: 021 906 256

Component: MOTRONIC M3.8.1 HS V04

Coding: 00000

Shop #: WSC 01317

1 Fault Found:

00533 - Idle Speed Regulation

14-00 - Adaptation Limit (Add) Exceeded

Readiness: N/A

This one comes back straight away after clearing the codes everytime, does anyone know what it means, i assume its an idle control valve or similar?

Is there a list anywhere or which parts the codes relate to?

Thanks

[UnitedMotorsport 55]

Plug VAGCOM back in, go into engine, select 'Measure blocks'

Type 1 into the 1st box, monitor the 3rd box on that row, when the engine temp is above 40 degree C this figure will oscilate. This is how much the lambda probe is trimming.

let me know what it says on a warm engine at idle.

[C3 LJG 0]

ok mate did what you said and got the following

680rpm - 75oC - between -4.7% and 3.9% - 5.3 BTDC

figures went down a bit after a blip of the throttle to about -3.1% and 2.8%

[UnitedMotorsport 55]

OK, try cleaning your throttle body.

[C3 LJG 0]

In what way mate?

I have recently done the coolant bypass of the throttle body would that have effected it?

[vr6madmike 0]

take the intake pipe off the throttle body and open it up, run a cloth with some carb cleaner on it around the butterfly valve,

[Ed 2]

yours is doing what mine is doing! what was your fix! its starting to piss me off now! bloooody cars!