Mk2 problems. Vacuum/Injector related?

[Mirage-]

Hey guys

Mk2 1.8 8v Golf Gti (digi)

Other the past few weeks my car has been playing up, it's got a lack of power up to 4-5k and is really lumpy.

When idling the revs dip from 300 to 1500 rpm almost stalling.  

Any recommendations of what to check?  Could it simply be timing as my mate did timing and hadn't dont it before.  Other things that I could think it might be were knackered injectors not allowing enough fuel or a vacuum leak.

What things should I check for the vacuum leak?

FYI it has a brand new ISV fitted.

Would it also be  possble for somebody to post a pic of their engine bay so that I can see what wires and such are missing as I noticed for start that the WOT sensor is disconnected/missing.

Thanks in advance

Ian

[davidhawkins_78]

Well if that sensor is missing then that's half the problem as although you can move the throttle to wide open, if the ECU never receives a single it'll not adjust the timing and fuel maps for max performance!

I'll see if I can sort a pic for you, might be some on the gallery already so have a look.

Also, when you say 'your mate' set the timing what was he actually setting, and why?

The ignition timing does have to be set in a specific way on a digi ... sounds like it could be your problem if it's retarded/advanced lots.

[Mirage-]

Basically I had a snapped exhaust manifold stud in the back of the head so had to remove the head to get it drilled/helicoiled so had head skimmed, new timing belt and it was the valve timing that he apparently set (timing belt).

As far as Im aware he hasn't touched the spark timing.

It's booked into garage next week for him to check and set the timing correctly.  Want to get it all sorted so that she's running nicely by Summer then it's re-spray, leather interior, ICE and coilovers.

Ian

[Blue MK2]

ive got a pic of my messy digi engine for you mate



Blue to the rescue

[davidhawkins_78]

Well if it was running ok before, then it'll have to be something from the head work (stating the obvious I know ... )

If the injectors were leaking the idle would be all over the place from the extra air. Providing the head went back the same way it was found, then it certainly looks like the static timing could be out. You have to be spot on with this, 1 degree either way and it'll have dramatic affect. I'd check the ignition timing too ... could be slightly out.

Would u feel confident checking these yourself? Might save you a garage bill .....

[Mirage-]

I've managed to meet a sound guy at a local garage - vw specialist who is gonna have a look over it early next week.  He recommends that I change the first injector as my mate looks to have bent it and cracked the bottom so both leaking air in and petrol out all over the top of my tb.

I'll sort new injectors/seals out tonight and see how I go. Not too bothered about cost as I have the money and don't mind putting it into my baby to keep her running how she should.

Thanks for the pic blue, looks like I gotta get cambelt covers and such anyhow as it's all belts in view on mine.  where abouts does the wiring come from for the WOT sensor? - sensor is there but no wiring.

Cheers

Ian