Urgent! K-Jet (not) running issues again

[quattrostyle]

Did I have problems with my coupe quattro a few years ago when heading for the Ring, now my 90 quattro is playing up and I have a meet/track session planned on this sunday.

Hopefully here are some K-Jet experts that could point me in the right direction.

First I will explain what has been done the past few days, this was just a general check/service. The car did not have real problems:
- new spark plugs, distributor cap and rotor
- new air filter
- ISV cleaned up because it ran like 2000 rpm on idle
- throttle body cleaned up
- K-Jet measuring flap cleaned up
- removed gunk from the PCV system hoses
- had the underside of the dash off under the steering wheel because there was quite a bit of play in the steering column

- removed the K-Jet from the top of the air filter box to check the piston in there. I did this because when the engine was warm it took a long while to start due to too much petrol I persume. Cleaned the piston up, there was some scoring on the top but nothing that can be felt by hand. Put the spring back in and the piston.

- when I removed the K-Jet from the filter box top section I did unscrew the torx bolts as well with don't actually hold the K-Jet itsself, so I put those back in. What do these torx bolts do?

All this was done at the same time and the car has not been started in between jobs.


Now the issues:
- car is very hard to start, overfuels by the looks of it
- won't idle at all, also not when up to temp
- when the throttle is released the engine dies immediately
- during driving the battery light glows but not constantly
- battery light blink during cranking over
- oil pressure alarm? beeps when the ignition is turned on

All in all the car is useless at the moment and it will be very hard to get it running by sunday

My guess for the running issues is that I have f*cked something up in the K-Jet. The piston seems to move freely enough though. I will at least try to get another K-Jet by the weekend but that will be hard.

Thanks in advance for your help

[John.]

I'm definitely NO expert regards k-jet but if you've stripped and cleaned this and that and are happy this has gone to plan then what about rechecking the dashboard bits......maybe something's been moved here?
Worth getting a voltmeter on the job and check the possible charging/dash issue?

[Eddy]

If you can get to Scotland I have a spare K-Jet.

The ISV are sh@t I binned mine a few years ago.
http://www.classic-audi.co.uk/forum/...ad.php?t=24571


http://www.classic-audi.co.uk/forum/...ad.php?t=24516


Un-plug this and the cold start injector.

Then turn the idle screw anti-clock wise (small brass screw side of the throttle body)

If it still won't idle you may have;
A bad warm up regulator
Blocked fuel filter (there are 3 of them btw ! )
Air leak in the induction system
A bad k-jet system

[msh]

Originally Posted by quattrostyle

- during driving the battery light glows but not constantly
- battery light blink during cranking over
- oil pressure alarm? beeps when the ignition is turned on

Check the blue wire which goes to alternator.

[slammedAudi]

Originally Posted by quattrostyle

D
- when I removed the K-Jet from the filter box top section I did unscrew the torx bolts as well with don't actually hold the K-Jet itsself, so I put those back in. What do these torx bolts do?

If you have broken the seal on the Fuel dizzy, it will need to be split and re-sealed..... or might be cheaper to replace altogether.....

[quattrostyle]

Comming to Scotland from the Netherlands won't happen before sunday . I think I f*cked it up by undoing the 2 torx bolts on top of the K-Jet. Although it doesn't leek it doesn't work anymore either or at least not like it should. I did open a K-Jet once and it can not be put together leak free again, or better I can't.

Eddy I like your solution for the idle stabilisation, will have to look into that once I get it up and running.

I'll have a look at the blue wire from the alternator, that would be a coincidence then.

Any idea why the oil pressure beep is there all of a sudden?

[M4rkp]

You need to check fuel delivery and spray pattern.

Check the delivery by disconnecting the return pipe to the tank and putting into a container - bridge the fuel pump relay and see how much fuel you get, should be around 900ml in 30 seconds.
If that looks about right remove the injectors and put them into 5 individual containers - again bridge the fuel pump relay ( obviously re connect the return line after doing the first test) - nothing should happen - no fuel should be dispensed. Now you need to lift the metering head plate - its under the large rubber 'mound' by the metering head - you should now see fuel come from the injectors, all should have a nice conical spray pattern and should all dispense around the same amount.

Do you have access to K-Jet pressure gauge to measure system pressure and more importantly control pressure? -

The other side of this is that you could be looking at unmetered air getting into the system - check the injector seats and more importantly the injector seals - they go hard and brittle after time.


Where are you based? - i've got the fuel pressure testing kit if you need to borrow it?

Mark

[quattrostyle]

Hi Mark, I'm somewehere up north...in the Netherlands that is.

I know the testing techniques youe described, did this on my coupe when I had troubles with that. In that case changing the metering head was the only thing that worked. I'm afraid that will be the case now as well. I don't have the pressure testing kit.
Thing is, the problems were there right after I had the metering head off so pretty sure I did f*ck it up by taking the 'piston' out of the metering head or undoing the aforementioned torx bolts.

[quattrostyle]

*insert exciting music here*

...the oscar for solving this running issue on my 90 quattro goes to quattro-nick (S2forum)!

Started the car which was no problem with a cold engine, got out of the car immediately played a bit with the throttle with my right hand and adjusted the CO screw anti-clockwise and it ran ok It also starts better now when warm but will go to a local garage to do some finetuning.

A member on the Dutch type8185 forum told me that the oil pressure alarm is related to low voltage in one way or another. Will have to look into the wiring and the alternator as the battery light is lit almost constantly now and the voltage at the battery when running is just above 12V.

Many thanks guys for your help