Rough idle and stumble when in closed loop
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
So good news and bad news. Good news o2 sensor was wired incorrectly now its reading and the low stumble is gone. Bad news. The car now idles at 1000 rpm which is a little odd it wasnt doing that before. And on my scanner it looks like its running lean because the blms are high it also had a huge knock count of like 64 so im assuming its to lean. Not to worry i didnt hurt the motor i run 93 octane and wasnt beating on it to hard.
My new question is do i need a different tune or an adjustable fuel pressure regulator? And i guess i just need to do the idle reset procedure and should i reset the computer now that i got the o2 sensor working?
My new question is do i need a different tune or an adjustable fuel pressure regulator? And i guess i just need to do the idle reset procedure and should i reset the computer now that i got the o2 sensor working?
Thread Starter
Instructor
Joined: Dec 2012
Posts: 120
Likes: 1
From: Canton Georgia
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Im thinking if they tuned your car while you had this problem, then they tuned your car to compensate for this problem.. In other words they tuned the car originally around this problem, now that you got the O2 sensor straightend out and working correctly ,they may have to "tweek" the tune to get it right....This is why my tuner wanted to make sure everything on my car was funtioning properly before he started tuning....WW
Thread Starter
Instructor
Joined: Dec 2012
Posts: 120
Likes: 1
From: Canton Georgia
Im thinking if they tuned your car while you had this problem, then they tuned your car to compensate for this problem.. In other words they tuned the car originally around this problem, now that you got the O2 sensor straightend out and working correctly ,they may have to "tweek" the tune to get it right....This is why my tuner wanted to make sure everything on my car was funtioning properly before he started tuning....WW
Thread Starter
Instructor
Joined: Dec 2012
Posts: 120
Likes: 1
From: Canton Georgia
So basically my whole problem was the wire that goes to the ecm from the o2 sensor was wired to my ground for the heated part. Once i did some extra digging i found out that these universal o2 sensor have three wires. Two the same color and one different. The two that are the same are the color is the ground and power. It doesnt matter which is which. The different colored wire actually goes to the ecm. I tried a new sensor and it had the exact same problem. Once i wired it right and drove the car around a little the problem was fixed. I've never had this car running so smoothly even with the ac on. Thanks for all your help guys this car rocks now 
