Help for a newbie - Mk3 Gti 2.0litre 16v

[Len]

 
Gotta an intermitent misfire problem. this usually happens between 3000 and 4000 rpm and when coasting or overrun - trying to keep a constant speed.

Done so far - changed plugs/leads/ dizzie and coil. Done a compression test to check for sticky valve/tappet. Had fault check and taken out the ECU and sent it away to specialist and came back fine.

No difference made by any of these!

So looking for some help or guidance please.

Len

[Len]

Just read the other Misfire post.

Doesnt apply to mine - havent got an airflow meter, thats in the ECU.

[golfvr6]

Try fuel pump and ECU relays.  A common fault with mk3's.

[Len]

Have checked fuel pump - but it cant really be that coz it doesnt happen on full trottle.

Think its a fuel/air problem.

How do i check the ECU Relays?

[Blue MK2]

after a short run. take the relay out and place it on your cheek to see if its warm.....if it is then it works

[Len]

Um sorry guys - dont really know my way round this engine bay.

Please give me an idea where these relays are!
 

[Blue MK2]

the relays are in the fuse board (under the dash) they are the square shaped black or silver things and can be replaced by pulling them out

[Len]

Thanks mate - i 'll give that a go.

Was also advised to check the ECU earths - so looks as if i need to get to grips with the wiring diagrams!

hate those bloody Haynes manual ones!

[brains]

stop right now

i have had your problems and i have also tried everthing you have said, but with no success

untill i replaced the fuel pump relay, cost me about 12 notes and the car has never run smoother!

it's well worth the chance!!

hope this helps

[Len]

Cheers Brains - i'll try anything once!  

Nice to know i aint the only one thats had the same problem.