MoabB2
Well-Known Member
- Joined
- March 21, 2006
- Messages
- 575
- Reaction score
- 6
- City, State
- South Jordan, Utah
- Year, Model & Trim Level
- 89 Bronco II (97 Mercury)
Ok, here it goes. This has been an ongoing battle for a year now and no one seems to know what the problem is.
I have transplanted a 1997 Mercury Mountaineer 5.0L V8, GT-40p heads, along with stock AODE 4r70w transmission and all stock wiring and computers into a 1989 Bronco II. Basically, the Bronco II thinks it is a 97 Mountaineer and the only code I am getting is P0453. The motor is all stock except for Advanced Adapters Headers, K&N filter, and Dual Flowmaster exhaust. I should also mention that I run 33 inch tires with 3.73 gears.
Now for the problem. The right bank is running rich. It is not throwing any rich codes, but you can smell the exhaust on the right side is very gassy! Also, the engine seems to run well for the first couple minutes when it is cold(closed loop), but then when it warms up it will run horribly. It usually idles fine, although idle is getting worse. Under acceleration it bogs down really bad and has no power at all! It kind of surges in and out of power. On the highway it has a hard time keeping speed and on hills bogs down really bad. When I down shift the engine revs...but still, no power. It will accelerate slowly, but not as much as it should for how hard the engine is laboring. I also hear the occasional backfire in the exhaust system.
I have checked fuel pressure, it is in spec.
I have cleaned the MAF, and replaced it, no change.
I have cleaned the TPS also.
O2 sensors have been replaced and swapped time and time over. No change.
Injectors have been pressure tested, no leaks.
I have plugged in two different stock 97 computers, no change.
Street Performance created a custom wiring harness, no change.
Does anybody have a clue as to what may be the cause of my problem? Is it something internal in the engine? Thanks in advance for any info!
I have transplanted a 1997 Mercury Mountaineer 5.0L V8, GT-40p heads, along with stock AODE 4r70w transmission and all stock wiring and computers into a 1989 Bronco II. Basically, the Bronco II thinks it is a 97 Mountaineer and the only code I am getting is P0453. The motor is all stock except for Advanced Adapters Headers, K&N filter, and Dual Flowmaster exhaust. I should also mention that I run 33 inch tires with 3.73 gears.
Now for the problem. The right bank is running rich. It is not throwing any rich codes, but you can smell the exhaust on the right side is very gassy! Also, the engine seems to run well for the first couple minutes when it is cold(closed loop), but then when it warms up it will run horribly. It usually idles fine, although idle is getting worse. Under acceleration it bogs down really bad and has no power at all! It kind of surges in and out of power. On the highway it has a hard time keeping speed and on hills bogs down really bad. When I down shift the engine revs...but still, no power. It will accelerate slowly, but not as much as it should for how hard the engine is laboring. I also hear the occasional backfire in the exhaust system.
I have checked fuel pressure, it is in spec.
I have cleaned the MAF, and replaced it, no change.
I have cleaned the TPS also.
O2 sensors have been replaced and swapped time and time over. No change.
Injectors have been pressure tested, no leaks.
I have plugged in two different stock 97 computers, no change.
Street Performance created a custom wiring harness, no change.
Does anybody have a clue as to what may be the cause of my problem? Is it something internal in the engine? Thanks in advance for any info!