Fuel Trim Problem
Thread Starter
FormerVendor
iTrader: (18)
Joined: Jan 2007
Posts: 587
Likes: 0
From: Lost Angels, CA
Fuel Trim Problem I have been trying to diagnose and solve this problem for a while.
The car thinks Bank 2 is lean and is dumping fuel on it. Causing 10MPG!
I have tried to seal up any intake or exhaust leak, but the O2 still does not osolate and it is new.
here is the latest readings from the car.
Anyone have any idea what could be causing this situation?
The car thinks Bank 2 is lean and is dumping fuel on it. Causing 10MPG!
I have tried to seal up any intake or exhaust leak, but the O2 still does not osolate and it is new.
here is the latest readings from the car.
Anyone have any idea what could be causing this situation?
TECH Enthusiast
Joined: Sep 2005
Posts: 503
Likes: 54
From: TX
Check the injector O-rings for vacuum leaks. Same thing happen to me once, spray some water into the bungs, that makes it easy to detect leaks. Also check for leaks where the intake meets the head. Also the wiring harness for that o2 sensor.
Thread Starter
FormerVendor
iTrader: (18)
Joined: Jan 2007
Posts: 587
Likes: 0
From: Lost Angels, CA
I should mention that I have been working on this for a while
So far here are the things I have done/checked
1. Injector o rings - sprayed ether to see if engine reves up - nada
2. replaced intake and gaskets - with ported for 58mm tb
3. replaced exhaust gasket and rtv sealed it to header
4. block off plates
5. RTV collector to Y pipe
6. Tighened #8 plug (it was loose) and it is the black one. #4 was gray
7. replaced O2 sensor
8. I am sure there is more I am forgetting.
9. Fixed vacuum leak from Pass firewall (to vents)
I have been told to triple check the wiring. It is not near the headers I could try swaping the bank one good O2 over but likely with the same results.
So far here are the things I have done/checked
1. Injector o rings - sprayed ether to see if engine reves up - nada
2. replaced intake and gaskets - with ported for 58mm tb
3. replaced exhaust gasket and rtv sealed it to header
4. block off plates
5. RTV collector to Y pipe
6. Tighened #8 plug (it was loose) and it is the black one. #4 was gray
7. replaced O2 sensor
8. I am sure there is more I am forgetting.
9. Fixed vacuum leak from Pass firewall (to vents)
I have been told to triple check the wiring. It is not near the headers I could try swaping the bank one good O2 over but likely with the same results.
Is the check engine light on? Any codes? It appears that the bank 2 sensor is flat lined at .445 indicating that the circuit is open. Likely a broken, corroded, melted wire in the harness.
