'90 200 tqa running poorly

[Huw Powell]

The OXS is easy to test - just disconnect it.

Huw

On 7/18/2011 9:36 AM, Nick Lawrence wrote:
> Vehicle is 1990 audi 200 tqa.
> After a few stop and start errands Sunday the car wouldn't start. it would crank and occasionaly fire and quit. I swapped the fuel pump relay, then removed and jumpered the relay. I pulled off enough covers to hear the the fuel pump, it was humming.
> After sitting, fiddling and cussing for about half an hour the car started but ran rough and really felt like missing.
> Made it home, replaced the spark plugs no change.
> However mash the pedal and it will rev and boost the normal 1.8-1.9, feels like normal power.  but back at idle and low speed still bucks and stumbles.
>
> I swapped in another dist cap and wires.
> It will stall when  the oil cap is loosened, but not when the dip stick is pulled. (I thought it used to)
> I checked compression    130- 150 .
> If fuel pressure was off could it still run boost and have adequate power?
> If the oxygen sensor failed would the car run really bad?  In my million miles of Audi's i have never experienced any change good or bad when replacing oxygen sensors.
> Anybody ever see an ignition coil fail in this manner?
>
> Hoping for more ideas to check out.
>
> Nick  central Ohio
>
>
>
>
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information
>