I have a 1986 Audi 80 Sport 1.8 injection engine, as of last year it
has had a very intermittent problem.
The problem is that the engine seems to have absolutely no power if
you put your foot to the floor it just has no grunt. I've had to pull
over when it has happened on motorways and when you get off the
throttle it manages to stall itself it has so little power. We suspect
it could be a fuel supply problem as there is no miss-firing, that i
would expect with a spark plug problem. We've gone though and check
all the fuel pump connections but they all seem ok. The strange thing
is that is is a very intermittent problem it happened once a year ago,
about 1.5 months ago and 1 week ago. The only slight pattern is that
it has been running for a bit in stop start traffic, the problem then
occurs a little while after getting going again. All the dials are
normal and it is not running very hot.
Once you stop the car and re-start it it is fine, although it can
start the cycle again after a few miles but not every time. The fuel
take is not running on dregs either but as we thought it was a fuel
supply problem we did top it up with high octane fuel after each
occurrence as it was fine after that, but that could also be as it was
stopped for a little while too.
We've also tried disconnecting the vacuum tube that changing the
timing at higher revs to see if it was that but it made no difference.
Does anyone have any ideas for experienced this problem in the past?