Audi 80 2.0L ABK engine juddering/misfire

**brd** · 20-02-2007,09:07 AM

So... an update... no update!
Damn.... I changed the MAF, but no luck... still the intermittant stuttering.
Was driving in this morning in town and it started again... then a few minutes later it stopped and ran fine the rest of the way to work. It really feels like an obstruction or something in the fuel system causing starvation or something. Any ideas?
I have ordered an ECT and will try that.
Has been in with Audi four times now, but still the same, nothing on diagnostics and no solution. Being intermittant doesn't help, but they did experience the problem themselves, so they know its a real problem.
Any ideas much appreciated!!
B.

**kbowern** · 22-02-2007,01:05 PM

mine still has problem, but it's a lot better than it was, probably occurs once every too weeks now, which is good for me. I'll probably just live with it
a my car is an old. L reg.

**brd** · 23-02-2007,10:55 AM

I find that with the colder weather it doesn't do it as often. I'm not looking forward to when it gets warm again and if it starts acting up alot more then. The ECT is on its way... so I'll keep you posted if that does anything. After that I don't know.. leaky injectors or something like that?

**chaos** · 24-02-2007,10:20 PM

I'm having the misfiring problem with a 1995 Audi a6 also running an abk engine i have discovered that restarting the engine cures it for a time no fault codes found however it has reduced since i replaced my back box and lambda sensor I'll report back when i finally find the cause however at this rate MAF sensor ht leads plugs rotor arm and cap fuel filter shed loads of different injection cleaners I'm feeling the pinch at the moment

**kbowern** · 25-02-2007,01:17 PM

What is the "ignition amplifier unit" and where is it located. As you can see I am not a expert on these things. Would it exist on an L reg Audi 80.

**Wings** · 25-02-2007,03:17 PM

Well, I had this thing happen to my Audi 80 Avant 1994 2.0 Litre.
Rather my wife, as she was driving it when it happened...

She was driving all nice and easy, then a sudden (and loud) metal/metal sound, and the engine lost power. She continued to the nearest area where safe parking could be found (1/4 mile) and stopped.
The engine sounded as it had severe timing-pings...
I suspected the timing-belt had jumped one or more teeths, so I immediately bought a new belt and flywheel.
I changed it myself (didn't check to see if it actually had jumped position...drats!) and after re-aligning the engine I tried to start it. Well, it started, however same noise in the engine.
The other day I bought a compression-gauge and hoocked it up after checking for sufficient spark on all four leads.
The thing is that it wasn't running good on cyl 1 and 2, but perfect on 3 and 4.
The compression-gauge was well invested money (I'm sorry to say).
It showed 11 - 11,5 bar on 3 and 4, and 1,5 bar on 1 and 2.

Now I'm gonna replace the valves for 1 and 2...and depending on the kit maybe for 3 and 4 as well...along with the head-gasket and what-not.
*****!!!

By the way, the engine has run 200925 miles!!! and uses virtually no oil and only 0,8 litre gas per 10 kilometers.

**brd** · 26-02-2007,11:52 AM

Thanks Andy, I'd like to check into that too ... if the new ECT doesn't help. Will keep you posted.
@Chaos: I have changed pretty much all the same components as you there, and still no joy.... yet!

**chaos** · 08-03-2007,02:39 AM

could be on to something here running on a hunch I'm looking at the idle control valve as when the misfire occures the engine tends not to idle too nicely I'm currently running forte gas treatment through in a sort of vain hope from what i've read about the idle control valve is that its some electronics adjustment will keep you posted

**brd** · 08-03-2007,09:36 AM

@ chaos: ok... thanks. Any news helps.
I changed the ECT... didn't do diddley squat... still the same problem. And with the weather getting warmer, its getting worse ... such a pain.

@ Andy B8: Any luck/time/etc with a ref or pic or etc for the "ignition amplifier unit"? Any idea how to check it?

**Wings** · 09-03-2007,08:31 PM

Hey there Brb...
Did you ever check the rubber-sealing at the base of the carb?
Maybe it is getting false air through micro-cracks in the sealing.
Try to run on idle, grab a can of starting-gas, and gently spray some directly on the seal...small amounts only...and work your way around the whole seal.
If false air-intake is the problem, the engine will change rpm as you deploy the gas. Maybe...?