Cylinder 3 “misfire”
Thread Starter
Joined: Feb 2020
Posts: 9
From: New york
Since you had the head(s) off it seems like an exhaust system leak is the culprit this time around. Exhaust leaks will sound like a machine gun and if they are upstream of the O2 sensors, can cause the car to run like crap. Take a code scanner with live data viewing and take a look at you fuel trims (LTFT and STFT), those are probably really high, Positive. That would also cause your plugs to be black since they are getting a ton of extra fuel dumped into them.
when the car is cold, you can get under it when you first start it to easily find the leak. Look at the exhaust manifold, manifold to exhaust flange, and exhaust pipe to catalytic converter flange for cracks or missing pieces.
when the car is cold, you can get under it when you first start it to easily find the leak. Look at the exhaust manifold, manifold to exhaust flange, and exhaust pipe to catalytic converter flange for cracks or missing pieces.
Thread Starter
Joined: Feb 2020
Posts: 9
From: New york
Since you had the head(s) off it seems like an exhaust system leak is the culprit this time around. Exhaust leaks will sound like a machine gun and if they are upstream of the O2 sensors, can cause the car to run like crap. Take a code scanner with live data viewing and take a look at you fuel trims (LTFT and STFT), those are probably really high, Positive. That would also cause your plugs to be black since they are getting a ton of extra fuel dumped into them.
when the car is cold, you can get under it when you first start it to easily find the leak. Look at the exhaust manifold, manifold to exhaust flange, and exhaust pipe to catalytic converter flange for cracks or missing pieces.
when the car is cold, you can get under it when you first start it to easily find the leak. Look at the exhaust manifold, manifold to exhaust flange, and exhaust pipe to catalytic converter flange for cracks or missing pieces.
Also here is a pic of the live data at warm idle, just Incase I’m getting something confused
Thread Starter
Joined: Feb 2020
Posts: 9
From: New york
So this was after about a 10 mile trip on the highway, it ran about the same way the whole trip with the HTFT going up into the high 20s at times... i obviously have no knowledge about this stuff, but is one bank running rich, and one lean?? What would cause that??
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xflashjr
V6 (1994-2004) Mustangs
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Jan 16, 2019 07:36 AM