mk3 2.0 gti 16v abf (96) idle and miss firing at 3,000rmp

[mani12354]

Hi everyone,

this issue on the car is properly haunting me :| when its idleing it miss firing, when held at 3rpm when driving it shake backwords n forwards, also running really rich. PLUS! it wont connect to the computer for some odd reason :|

i have cleaned the following and done a compression test.

new fuel filter
new fuel pressure regulator
new spark plugs
new distributor cap
new ht leads
cleaned the injectors
cleaned the throttle body
new battery

had it seen by 3 mechanics << LOL!

i so need help with this car i dont no what more it can be oh plus the car aerial has no signal for a bizzarre reason :|

cheers

mani

[thai-wronghorse]

Ecu related problem maybe?

[mani12354]

where can i get a new ecu from??? 

[thai-wronghorse]

It could also be a vacuum leak, id check all the hoses before buying another ecu although that wouldn't explain not being able to connect to Vagcom.

[mani12354]

question is which vacum  could it be?

[thai-wronghorse]

IF it is the ecu then heres a few but remember they're not all the same so check the code on yours plus you'll need the matching immobilisetr key chip with it or you'll have to get it reprogrammed.

http://shop.ebay.co.uk/i.html?_from=R40&_npmv=3&_trksid=p3902.m570.l1313&_nkw=abf+ecu&_sacat=See-All-Categories

[thai-wronghorse]

question is which vacum  could it be?

The thin cotton covered tube that runs from the rear of the throttle body to the ecu quite often perishes due to the heat from the manifold below.

[mani12354]

thing is also u smell petrol around the engine bay! :O like it over fueling

[mk2_abf]

throttle position sensor  must be faulty try unplugging it the revs might drop could indicate a fault

[Leon27]

Ecu related problem maybe?

+1 to that. You tried a new ECU relay? If you push through from 3k to after 4k and the fault clears then try a new relay (no.30). Fuel smell could be a secondary fault or something else is wrong.