Markus

Update, After posting my original message I ran to the parts store and installed a fuel filter. It seemed logical to me as the cylinders that seemed to have an issue were a short hop from the working cylinder so maybe the filter was somewhat plugged and was starving the problem cylinder. (thanks for the input ejlain, I agree) $24 later no change! IT needed replaced anyway. I pulled the codes and have a 22, detonation sensor (thanks 777). Pulled it and brass brushed the corrosion off. Cleared the codes and took for a drive. ARRGGG! It ran worse that before...missing etc. Hmmm....sensor must be working and ECU is used to non-working sensor that retards timing but hasn't lately. Reset ECU again.....which it is doing right now. Will get back with results. Hope it drives cause I have to take a daughter to school program. Markus

I have used this site for searches several times to help solve my Soob problems but I am stuck now and am looking for specific help from the Subaru Gurus. A couple weeks ago the Soob (1990 Legacy LS) started idling badly. It was ok the next day then bad the day after that to the point where the whole car shakes. It runs progressively better at 1000 through 2500 plus RPMs. I have checked the TPS for resistance and idle switch location and performace (checked OK, idle switch was slightly out and adjusted), replaced the plugs, wires, cleaned the IACand reset the ECU using Legacy777's procedure. After the reset - no real change. I have spark at the coil pack for each cylinder and spark at the plugs. What I just discovered after reseting the ECU this morning is that when I remove the wires for cylinders 2 & 3 (at the same time or separately) there is no change in engine performance, I missed that last weekend. So...I'm idling on 2 cylinders and running on 4, cause the soob runs pretty good at 55mph? It seems to run ok at faster rpms. When this started it sure seemed like a sensor shorting on a damp day and then clearing up as I stated. Anyone have any ideas? How are cylinders 2 & 3 related? I can't seem to find any help in Haynes. Also, the 1990 Legacy does not have an EGR? I can't find it where Haynes shows it or anywhere else on the engine, I'd suspect that if I could find it. Any help would be great as it is getting annoying bouncing around at stop lights. Markus