Chicken or the Egg ?? Bad 02 or rich condition ??
08-22-2004, 10:19 PM
#1
TECH Enthusiast
Thread Starter
Join Date: Aug 2003
Posts: 506
Likes: 0
Received 0 Likes
on
0 Posts
Chicken or the Egg ?? Bad 02 or rich condition ?? ARG !!
I was cruising and got an ses light. my car started shuttering and lightly backfiring / missfiring. I nursed it home and pulled the valve covers, no broken springs. I pulled the plugs and the four drivers side ones were pitch black like nothing I have ever seen. Pass side looked fine . .. if anything a little lean.
We cleaned them up and checked the car over for any vacuum leaks. . . .cant find any. Hooked the computer up and went for a drive , drivers side 02 sensor is pegged flat lean and not moving exept small speratic blips up to 350 mvs every once and a while. LTFT's on the drivers side are +25 and pass side +3 - +4.
Do you think it was the bad o2 that was causing the bank to run rich ?? Is there any vacuum lines on the drivers side ?? I dont want to replace the 02 and have it take a crap again.
A little while before this both banks were +25 lean and the car was getting like 6mpg. Turned out the manifold bolts had backed off a bit , I re torqued them and the LTFT's started to come right back down after some driving to about -1.5 - +6 on both banks. Drivers side was usually about 2 points leaner all the time too . . . .now its fucked again.
I was cruising and got an ses light. my car started shuttering and lightly backfiring / missfiring. I nursed it home and pulled the valve covers, no broken springs. I pulled the plugs and the four drivers side ones were pitch black like nothing I have ever seen. Pass side looked fine . .. if anything a little lean.
We cleaned them up and checked the car over for any vacuum leaks. . . .cant find any. Hooked the computer up and went for a drive , drivers side 02 sensor is pegged flat lean and not moving exept small speratic blips up to 350 mvs every once and a while. LTFT's on the drivers side are +25 and pass side +3 - +4.
Do you think it was the bad o2 that was causing the bank to run rich ?? Is there any vacuum lines on the drivers side ?? I dont want to replace the 02 and have it take a crap again.
A little while before this both banks were +25 lean and the car was getting like 6mpg. Turned out the manifold bolts had backed off a bit , I re torqued them and the LTFT's started to come right back down after some driving to about -1.5 - +6 on both banks. Drivers side was usually about 2 points leaner all the time too . . . .now its fucked again.
