|
My basic assumption comes from your OX sensor code. I tells a great deal about the root cause.
An alway lean is telling that the engine is detected as running rich.
Just the oppisite of what you may think.
It means the computer fuel tables are shifted lean and not the engine.
How does it get to running rich?
A. air leak into the intake, after the throttle body.
B. fuel regulator diaphram leaking into it's vacuum hose.
C. fuel pressure to high.
D. leaking injectors.
E. possible air leak into the exhaust ahead of the OX sensor.
Any one or more of these conditions are detected by the OX sensor to the point it no longer can switch in it's normal way because it it always out of range to much fuel in the exhaust gas (cool).
A cold start should go high idle then come down as the engine and exhaust heats up.
If this is not happening to begin, there may be more than one fault present at the same time..
Cold start opens the IAC to provide air. If there is a leak besides, it may close down and not contol the idle because there is no other way to do this.
At the same time the fuel is rich because the ECT and ACT has signaled the EEC to do that due to the cold temp.
This is all accomplished at the time the ignition switch is goes from OFF to RUN, then to crank.
Make a good investigation of every area where hoses, gaskets and mating surfaces could be open to air.
|