1128 & 1130

[TerryT]

Originally Posted by paulv

Terry,

Here's the info for P1128 & 1130:

Fault condition:
Fuel/air mixture so lean that sensing has reached its rich threshold.

Potential fault areas:
– Incorrect signal from MAF sensor
-- MAF is failing
– Intake air system leaking
-- Air is introduced past the MAF causing the mixture to be more lean
– Fuel pressure too low
-- Not enough fuel to meet demand causing the mixture to be more lean
– Volume supply of fuel pump too low
-- Not enough fuel to meet demand causing the mixture to be more lean
– Fuel injectors fouled
-- Not enough fuel to meet demand causing the mixture to be more lean
– Exhaust system leaking
-- When the exhaust system has leaks before the front O2 sensor will cause the O2 sensor to report a lean condition (excess oxygen i the exhaust)

BTW, I agree with Meir's recommendation. I have the Durametric tool and could have ruled out the MAF sensor in a couple of minutes (with the service info) -- with the key on and engine off, the MAF voltage should be approx 0.9 to 1.1 volts -- at idle, the voltage should be approx 1.4 volts.

Regards,
paul...

Excellent post Paul, thank you!

I will be getting the Durametric tool, but possibly only within the next few weeks.

My CEL comes on with these codes when I am idling, not when driving... would that narrow the list down somewhat ? Any ideas why it would happen then ?

Thanks again.
Terry