My Audi 100 '89 (manual transmission) has Abruptly developed a problem
while my wife was driving uphill and was changing to a lower gear.
This happened about 3 years ago.
Description of problem:
- The car runs very rough as if only 3 or 4 of the 5 cylinders were
firing during idle and attempted ride on the road.
- It always starts OK even after not being started for months.
- When I try to rev up the engine the car struggles to increase the
RPM, however when I release my foot from the gas pedal the RPM seems to
pick up. I can then sort of pump the gas pedal and get the RPM quite
high, as high as I want to.
- I sometimes attempt to drive the car but it has consistently very
I have been trying to get to the bottom of the problem with no luck
trying various things over the last three years.
I have done the following (don't remember all the things I've done):
- replaced fuel filter,
- cleaned air filter,
- tried different spark plugs, cables, distributor cap
- I have looked extensively for a bad ground connection. I have
actually had a problem with my 85Audi5000 which closely resembled this
one where the problem was a broken ground wire.
- I have checked various wiring from the Fuel injection Control unit
and from the Ignition Control Unit.
- I have removed the ICV and made sure it is not stuck
- I have looked extensively for vacuum leaks.
The problem has never budged. The problem happened from one second to
the next and subsequently never subsided regardless of which cables I
touched while the engine was running.
I hope that someone has seen such problem before and had more luck than
me dealing with the problem.
Thank you for any hints or advice,