The motor has been throwing codes 173 & 137 (rich bank 1 & 2). Here's what I have done so far;
changed the O2 sensors
changed plugs today (plugs were black on both banks except for the very tip of the plug) but light still comes on.
run balance test on scanner, OK
swapped ECU
All of this has resulted in no change. Here's where I am now;
No long term fuel trim numbers for either side after 30 miles of driving and 15 to 20 minutes of idling
bank 2 O2 sensor only shows reaction between .86 and .95
bank 1 O2 sensor shows normal reaction .24 to .85
Cleaned MAF wire
Idle speed runs up and down constantly between 825 and 1,000 rpm
CEL can come and go. Driving for 15 minutes at various speeds, no light. Sometimes the light will come on immediately. When the light comes on, sometimes it will stay on for an extended period. Other times it can turn off within a couple minutes. I can't relate this to any type of vibration or bump in the road.
Any suggestions on where to go from here? How can I check the injectors while in the car? (But all plugs were black from soot.) Can the fuel pressure be too low? It's showing about 33lbs vacuum off. After I turn the motor off, I can watch the pressure pulse slightly as it falls to zero in about 10 minutes.
Could it be the MAF?
HELP!!!
changed the O2 sensors
changed plugs today (plugs were black on both banks except for the very tip of the plug) but light still comes on.
run balance test on scanner, OK
swapped ECU
All of this has resulted in no change. Here's where I am now;
No long term fuel trim numbers for either side after 30 miles of driving and 15 to 20 minutes of idling
bank 2 O2 sensor only shows reaction between .86 and .95
bank 1 O2 sensor shows normal reaction .24 to .85
Cleaned MAF wire
Idle speed runs up and down constantly between 825 and 1,000 rpm
CEL can come and go. Driving for 15 minutes at various speeds, no light. Sometimes the light will come on immediately. When the light comes on, sometimes it will stay on for an extended period. Other times it can turn off within a couple minutes. I can't relate this to any type of vibration or bump in the road.
Any suggestions on where to go from here? How can I check the injectors while in the car? (But all plugs were black from soot.) Can the fuel pressure be too low? It's showing about 33lbs vacuum off. After I turn the motor off, I can watch the pressure pulse slightly as it falls to zero in about 10 minutes.
Could it be the MAF?
HELP!!!