MISS FIRE

[leyton]

can anyone help me got a miss fire on my mk4 gti turbo taken it to a main dealer they can't find the problem i have changed coil packs spark pulgs done compresion test on every pot 160 psi in each the best the main dealer could come up with is it might be my blow off valve  

[nrgizerbunny]

mmm.... tricky

usually piston ring on one of the pistons has gone but doesn't sound like it. Just one other thing, make sure that the compression is 160psi and not just falling away dramatically on any particular cylinder which indicates a piston ring failure.

also make sure your knock sensor is working correctly, if the ignition is retarded too much it will cause a missfire.

do you know what engine code you have? and also is it a petrold ordiesel?

hope this helps

sanj

[leyton]

enging code is agu and its petol

[kniterider]

blow off valves have been known to cause problems!!, but i dont think thats it, get em to change coil packs again as this is a constant on going problem on mk 4 1.8 t's, there should be some kind off error codes being shown on the vagcom???

[MarkG]

 

Hi, I have a MK4 GTI Turbo Year 2000 Engine code AGU, I have a similar if but intermittant problem, major misfires, but this only happens intermitantly, 3 times in a week, Ive been to VW dealers 3 times and had 3 computers looking for a fault, none found, I have changed the fuel filter as they suggested and it is stall causing a problem, im at my wits end. Any suggestions ?

[leyton]

took the car to a chip tuner today to see if he could find the problem of the miss fire had the car put back to standard it had been chiped to 220bhp so the last owner recons !!? any way the miss fire is still there so that put the chip out of the problem he finaly got it down to being the injector flooding the pot hense too wet no spark i now have a chip and a blow off valve for sale can any one give me a rough price what i sould be selling these for ??