Audi Repair Questions? Ask a Mechanic for Answers ASAP
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Did you do a compression test on all cylinders and if so were all at 120 psi?
Let me know so we can continue,thanks Pete.
O.k.,if your compression is 15 psi lower or more then the rest on cylinder 4 this can indicate a compression issue.I have seen 15 psi difference cause a misfire and had seen that the cylinder head valves were the issue.Let me know what you come up with here.
Have you tested to see if the #4 injector is being held open.It should have a pulse signal to operate it.Usually the injector will have power with the key on and then a ground pulse (off/on signal) when cranking over or when running.If it has a solid power and ground signal with the key on this is holding the injector open causing the cylinder to flood out causing this issue.This can be caused by a fault with damaged or shorted injector wiring leading from the computer to the injector or an issue with the computer itself needing replaced.
If this is o.k. let me know.
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