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Did you read the information listed in the “Idle Issues” thread on the home page? There is a wealth of information on there about diagnosing and fixing idle issues.
Did you check the basics? i.e. air filters, fuel pressure with a gauge? Check for vacuum leaks?
It might also be worth while location the exhaust leak you mentioned. I literally just went through this with my 90 Century (I even posted about it on here). I had a leak around the flange and the O2 sensor was right next to the leak causing the O2 sensor to give a faulty reading to the ECM thus creating a performance issue. I fixed the leak and it runs like a champ now.
It might also be worth while location the exhaust leak you mentioned. I literally just went through this with my 90 Century (I even posted about it on here). I had a leak around the flange and the O2 sensor was right next to the leak causing the O2 sensor to give a faulty reading to the ECM thus creating a performance issue. I fixed the leak and it runs like a champ now.
Yeah I used throttle body cleaner for the throttle body and the IAC . For the IAC passage I used a “soft” wire brush to clean it out.
Did you check the exhaust for any restrictions? Something like a clogged catalytic converter could give you idle issues and it could also cause the exhaust smell that you have.
Yeah I used throttle body cleaner for the throttle body and the IAC . For the IAC passage I used a “soft” wire brush to clean it out.
Did you check the exhaust for any restrictions? Something like a clogged catalytic converter could give you idle issues and it could also cause the exhaust smell that you have.
My wife’s Honda has a similar problem a couple years back. I cleaned the IAC it and didn’t make a difference, I tried replacing it with one that I got from a junk yard and that didn’t do anything either. I cleaned up the passage for the IAC and it was all gunked up and so was the throttle body. After they were cleaned the stalling issue was gone.
My wife’s Honda has a similar problem a couple years back. I cleaned the IAC it and didn’t make a difference, I tried replacing it with one that I got from a junk yard and that didn’t do anything either. I cleaned up the passage for the IAC and it was all gunked up and so was the throttle body. After they were cleaned the stalling issue was gone.
I looked over the engine today to see if there was anything else contributing to the misfire condition and noticed that 4 of the ignition wires were reversed on the coils so I switched them around and made sure that they were hooked up correctly.
The ignition wires that were backwards were on the middle and lower coil packs i.e. cylinder 5 was connected to the coil tower for cylinder 2 and cylinder 2 was connected to the coil tower for cylinder 5 and it was the same at the lower coil pack too.
I started the car and immediately noticed that the idle inside of the car was much smoother in regards to interior shaking. When I walked around to the exhaust to see if the misfire had vanished I noticed that it actually got worse and seemed to have more consistency to it, and as if it were misfiring on more cylinders now. I am absolutely positive that the plug wires are properly connected to the correct coil pack tower and to the proper cylinder. The spark plugs, coil packs, plug wires, and ICM are all new and all are OEM AC Delco parts.
What has me confused is that when I sit in the car it’s MUCH smoother at idle as compared to what it was before I corrected the mismatched ignition wires. I haven’t fixed the gasket at the flange yet but I’m gonna make an attempt to do it within the next few days to see if that has any effect. Any ideas?
I looked over the engine today to see if there was anything else contributing to the misfire condition and noticed that 4 of the ignition wires were reversed on the coils so I switched them around and made sure that they were hooked up correctly.
The ignition wires that were backwards were on the middle and lower coil packs i.e. cylinder 5 was connected to the coil tower for cylinder 2 and cylinder 2 was connected to the coil tower for cylinder 5 and it was the same at the lower coil pack too.
I started the car and immediately noticed that the idle inside of the car was much smoother in regards to interior shaking. When I walked around to the exhaust to see if the misfire had vanished I noticed that it actually got worse and seemed to have more consistency to it, and as if it were misfiring on more cylinders now. I am absolutely positive that the plug wires are properly connected to the correct coil pack tower and to the proper cylinder. The spark plugs, coil packs, plug wires, and ICM are all new and all are OEM AC Delco parts.
What has me confused is that when I sit in the car it’s MUCH smoother at idle as compared to what it was before I corrected the mismatched ignition wires. I haven’t fixed the gasket at the flange yet but I’m gonna make an attempt to do it within the next few days to see if that has any effect. Any ideas?
Thanks for the quick reply! This leak is definitely noticeable both inside and outside of the car and when I’m working around the engine I often get a whiff of a strong exhaust smell so I’m assuming that it’s coming from that flange gasket. It looks like it’s gonna be a royal pain to replace so I think I’ll wait until it’s a little warmer out to do it lol.
Thanks for the quick reply! This leak is definitely noticeable both inside and outside of the car and when I’m working around the engine I often get a whiff of a strong exhaust smell so I’m assuming that it’s coming from that flange gasket. It looks like it’s gonna be a royal pain to replace so I think I’ll wait until it’s a little warmer out to do it lol.