Could be number of things but the first that occur to me are:
- Replace fuel filter
- Replace air filter
- Not sure if the 90 5 cyl has ISV like mine but if it does, take apart and clean with brake cleaner. Also check the idle switch on the throttle body to be sure that it is telling the ISV to operate.
- Really sounds like leaky injectors.
T>
Hopefully someone can give me some ideas on how to proceed with this
> I have a 1988 Audi 90 5 cyl (fwd) and my engine runs pretty crappy...
> The timing is good, i replaced the wires, plugs, cap and rotor. I have
> run fuel injector cleaner through it a couple of times. The problem is
> that the car idles very low (500 rpm or less), and the exhaust smells
> pretty harsh.. not oily, more like it does not seem to be the right
> mixture.. the timing is good, as i recently suspected that was the
> problem and re-timed it, and it was one problem.. the distributor was
> firing a few degrees early.. But despite fixing this, the car still
> runs pretty bad.. I have good accel, but when idling, it is very low
> and when i accel i get a bit of smokey exhaust.. it does not really
> look like it is oily, looks like its not burnign the gas very well. I
> don't know if the o2 sensor is good, i am going to check that next,
> there are no leaks in the vacuum system as i had one, and fixed it.
> and the car has pretty low miles (119000) i bought it with 108000..
> Any thoughts or suggestions you may have i'd appreciate... thanks a > lot
>
> kevin