LS1 runs rough, sounds cammed, rich, LTFT pegged
06-20-2011, 08:50 PM
#21
Throw some o2 sensors on it and see what it does. My camaro had a real bad stumble at 3000rpms when going through the gears and would not pull to the rev limiter. We went to every extreme with the tune and it would not respond. I watches the o2 sensors on a scan and they were stuck at 500mv and no faults were stored. I put new ones in and and holy cow. The car woke up and ran like it was supposed to.
02-03-2013, 01:57 PM
#25
I was thinking about this last night laying in bed, don't ask me why. ADD is a horrible thing. LOL.
I don't know very much about the 98's but from what I do know is they were kinda of an oddball year since it was the first year for the LS1 in an F-body.
I "think" they the coils are wired different. I don't know if that would cause an issue if you had them wired like a 99 and up car.
Are all the sensors the same on the 98 compared to other years?
Thunder you said the tune was copied from a 98 PCM. Was it manually put in or just a copy/paste deal?
Concerning the LTFT's there was a newer F150 in the shop last month with similar problems. The LTFT's were stupid high but the STFT's weren't. It ended up being the MAF. At idle it was doing what it was suppose to but when you drove it(higher rpms)it was doing all sorts of stupid things.
Was the MAF calibrated properly? I'm just thinking out loud here.
I don't know very much about the 98's but from what I do know is they were kinda of an oddball year since it was the first year for the LS1 in an F-body.
I "think" they the coils are wired different. I don't know if that would cause an issue if you had them wired like a 99 and up car.
Are all the sensors the same on the 98 compared to other years?
Thunder you said the tune was copied from a 98 PCM. Was it manually put in or just a copy/paste deal?
Concerning the LTFT's there was a newer F150 in the shop last month with similar problems. The LTFT's were stupid high but the STFT's weren't. It ended up being the MAF. At idle it was doing what it was suppose to but when you drove it(higher rpms)it was doing all sorts of stupid things.
Was the MAF calibrated properly? I'm just thinking out loud here.
