16v GTI misfire (2000 - 3000rpm)

[lectrotek]

Great pic. Thanks for that.

ISV is for idle problems, right? Will cleaning it do anything to solve ignition at 2000-3000rpm?

Also, where is the ISV on that diagram?

Cheers guys.

[itavaltalainen]

ISV can also cause running issue but not too much (air flow through is fairly restricted)


ISV is part 1:

[lectrotek]

Thanks again Itava. 

[VW BUSH]

Might even have a coil you can have if you can get to Epsom, think 8v uses the same part.....

[SimonG]

Does the misfire occur randomly or is it there all the while?  If you have the chance I would hook up to VCDS and look at the live readings if possible.

However, I used to have a misfire that would occur randomly and it generally used to happen when cruising around 2500 - 3000rpm (that was most of my route driving between those values) and I sought advise and changed the ECU relay.  That seemed to do the trick, no misfire issues ever since.

Some people have reported issues with the fuel pump relay causing similar.  But to prevent unnecessary spending, check the basics first and swap components over from known working vehicles if you can.

[VW BUSH]

Second and third rule, have a spare ecu and pump relay with your coil.

[LR5V]

All these things difficult to do? I imagine coil + throttle body aren't too tricky...any pitfalls for a novice?

Apologies for not getting back to you sooner, seems you have been looked after
-All those fixes are pretty easy to do, most intense would be repairing the loom soldering in new cables.

Second and third rule, have a spare ecu and pump relay with your coil.

Yes relays are a good one too, the solder joints dry out and crack
iirc the ECU one can be easily re-soldered, fuel pump may be the same.

[lectrotek]

Thanks guys.

Update: Fitted new coil....Engine started

Took the distributor cap off to give a clean but was clean as a whistle. Put back on.

Went to test the coil out on the road...engine wouldn't start. Wouldn't even try and tick over. Tried to bump start. no joy.

I think it's the scorpion immobiliser that's f*cked. won't disengage. so pissed off.

Next question...Was the scorpion alarm standard spec with the later 16v? Trying to figure out what it takes to disable the immobiliser.

I love this car, but it's doing my head in!

[SimonG]

Not sure if it was standard or a dealer fit option.  Mine used to/has remains of the Scorpion alarm.  Don't forget that the vehicle is likely to have a factory immobiliser anyway.

What makes you feel as though it's the Scorpion?

[lectrotek]

update...

bypassed the immobiliser. still sketchy. will start 50% of time today. looks like starter motor is knackered or something. b*llocks!

Ah well. At least it's got a lovely, sparkly new coil