Audi 80 2.0L ABK engine juddering/misfire

**Wings** · 26-03-2007,02:31 PM

One more possibility; I talked to a VW-mechanic and he told me about a plasticplate located in the rear of the carb, where you have a sensor hooked up. This plate (apparently) is helping the sensor read the position of the venturi-valve inside the carb, and if this plate is moist or dirty, the computer will be unable to read the venturi correctly. So, unscrew 4 torx-screws, pull out the plate, wipe dry and clean with a cloth, re-insert and voila!
I have not tried this yet, but give me a couple of weeks and I'll give it a go...
By the way, my valves was undamaged, only the headgasket had burnt a 5 mm vide gap between burnchamber one and two.
Not it is replaced, and all is fine...for now.

**COT51E** · 27-03-2007,06:44 PM

1st post but glad to find more info on the abk (pain in the backside problem) of intermittent juddering etc.

i have replaced

plugs
fuel filter
ht leads
dizzy cap & arm
water temp sender
sender switch
lambda probe
thermostat (was knacked)

will try some of your tips but please keep this topic open untill someone has sorted the thing. wanting to sell the car and sods law the test drive will be a disaster as its got a mind of its own.

pete!

**COT51E** · 16-04-2007,08:05 PM

anyone got to the bottom of this prob yet!

**chaos** · 16-04-2007,11:46 PM

Think I've Found the root cause to be the distributor i have a test would be interested in other peoples results here i sprayed wd-40 into the distributer by removing the cap and static cover the problem went for almost an entire day of driving soon as i have the pennies i plan to get a new distributer about £38 +vat at euro car parts

**kbowern** · 17-04-2007,08:40 PM

about 2 years ago I had a new distributor, as car would not go at all. Actually had a new distributor to get a new "hall effect" unit which is part of the distributor, this fixed the car at the time, but the "miss fire" is currently back. At present it's doing it most of the time.

I am wondering if its the warm weather, as a previous post mentioned problems with warm weather. Something to do with the MAF.

**JSM** · 28-04-2007,11:53 AM

Just wondered if you ever got to the bottom of the misfiring problem. I have been having similar problems and have tried changing various parts but with no luck. Don't know what to try next.

**stevie160** · 03-05-2007,12:25 PM

I have read on an Amercan webite that a common problem is loss of power and backfiring caused by a clogged screen in the fuel pump for 1990-1992 audi 80's. Not sure if this is the same for uk cars.

I've got a similar problem with my newly purchased 1992 ABK. Does anybody know where the fuel pump is located as I can't seem to find it underneath or in the engine bay?

**brd** · 03-05-2007,01:02 PM

Hi, I think its either in the boot - remove the floor mat, and you should see it just behind the spare wheel well when looking in, mounted directly into the tank itself... or its underneath near the rear right hand side wheel (depending on whether saloon or coupe/cabrio and year).

I might just check that myself too in fact! ... as I STILL haven't fixed the damn problem. I have another ECU on the way and will keep you posted on whether that sorts the problem.

Brian.

**stevie160** · 03-05-2007,01:26 PM

Thanks. Mine must be in the boot. I'll let you know how I get on!

**COT51E** · 03-05-2007,02:37 PM

Has anyone replaced the maff/air flow box.

the one attached to the air box with the plug.

when mine did it on the driveway (running lumpy) i pulled the plug and it kept running (lumpy) then re attached plug and ran ok, i pulled the plug again and it nealy stalled befor re attaching.

i'm assuming this may be the culprate!!!!!