panicfilms

99.5 1.8tip
since I've gotten CEL for misfire on cyl. 3, I've done the following:
- replaced plugs with NGKs and verified gap
- replaced ignition control module
- swapped and verified coil packs are ok
- swapped and verified fuel injectors are ok
- compression test (210 on all 4 cylinders)

Last, I threw a diagnostic light on the wires that attach to the coilpacks. the good cylinders caused the light to blink but the bad cylinder gave a steady light--no flash.

I'm guessing the problem is either the wiring, or more likely, the ECU. Any ideas? Anyone want to donate an ecu to the "Fix the misfire" foundation? j/k but thanks for any info.

sightpost

some one did a great tech article on how to test it. You might have a bad one.<ul><li><a href="https://forums.audiworld.com/a4/msgs/1594531.phtml">This one here</a></li></ul>

panicfilms

I used that writeup to diagnose it was bad. Tried to fix it myself but it's impossible unless you have soldering skills.

sightpost

I kinda doubt it would be the ECU though. That would seem strange that there was a malfunction in the ECU but it only caused one problem and that one problem was a misfire on one cylinder.