Check Engine Light issue

[stateofidleness]

MAF Sensor.. save yourself the trouble and just replace it. It's about $230, but you'll have headaches from throwing other parts/ideas at it. Ask me how I know

[JFP in PA]

Originally Posted by stateofidleness

MAF Sensor.. save yourself the trouble and just replace it. It's about $230, but you'll have headaches from throwing other parts/ideas at it. Ask me how I know

I find that interesting as the P1128 and 1130 codes are an indication that the car has a problem keeping the system rich enough to maintain the A/F ratio; typically caused by either an intake system air leak or low fuel pressures......and nothing in the diagnostic tree even mentions testing or replacing the MAF……….

[Johnny Danger]

Originally Posted by JFP in PA

I find that interesting as the P1128 and 1130 codes are an indication that the car has a problem keeping the system rich enough to maintain the A/F ratio; typically caused by either an intake system air leak or low fuel pressures......and nothing in the diagnostic tree even mentions testing or replacing the MAF……….

My thoughts exactly . That's why I posted the codes . I can't imagine this has anything to do with the MAF sensor ??

[JFP in PA]

Originally Posted by Johnny Danger

My thoughts exactly . That's why I posted the codes . I can't imagine this has anything to do with the MAF sensor ??

In general, it does not have anything to do with the MAF; MAF codes are P0101, 0102, and 0103, depending on what the problem is.............

[JFP in PA]

Just for chuckles, over on RennTech, someone took out his MAF for cleaning, and forgot to reinstall it before driving off to work leaving the MAF sitting at home on the bench, apparently without any codes or problems. Now he wants to know if he needs to have it towed home or if he has done any permanent damage………….

[Topless]

Also from Renntech:

P1128, P1130
Possible fault causes:
– Incorrect signal from MAF sensor
– Intake air system leaking
– Fuel pressure too low
– Volume supply of fuel pump too low
– Fuel injectors fouled
– Exhaust system leaking

A fouled MAF can certainly cause the car to run lean... or rich tripping these codes. It still might be a failed MAF but an intake air leak is most often the cause.

[JFP in PA]

While you can "never say never", to date, we have not had a car throwing 1128 and/or 1130 alone turn out to be a MAF issue, it always turned out to be either a vacuum leak or fuel system issue. A fouled MAF usually throws one of the "implausible signal" (high or low voltage) codes, often in conjunction with other codes. As the RennTech case points out, you can run the car for longer than you might expect without a MAF, as long as you stay below 4K RPM’s and don’t have any WOT excursions, before the car throws any code, and then usually pops a P0102 and/or P0112 (low signal voltage for the MAF sensor and the intake air temp sensor).