changed maf sensor o2 sensor plugs, plug wires , coil pack , tps sensor , checked fuel pressure its good, checked vaccum for leaks none found, car does not have to be in gear to have te problem
2007-09-07 05:12:57 · 4 answers · asked by shalagre 1 in Cars & Transportation ➔ Car Makes ➔ GMC
this code is for the maf or mass air flow sensor,did you reset the computer after you changed it? pull the positive cable off the battery let it sit for 5-10 minutes then reconnect this will clear your saved codes
2007-09-07 05:42:36 · answer #1 · answered by marfanman00000 5 · 0⤊ 1⤋
I take it you mean the car is missing at times? The MAF code is because the motor is backfiring through the intake which is giving an erroneous reading to that sensor. This backfiring is not caused by the sensor, but a lot of sensors have been damaged by the backfiring. Once you've addressed the backfiring, you still might have a sensor that is not right. I see you've changed a lot of parts. This isn't the way to repair things. You have to diagnose and actually find them to get it right. It sounds as if the fuel system is working. I would check for fuel pressure anyways and start disconnecting injector connections one by one to be sure all injectors make the motor misfire the same when disconnected. I would then check for spark outputs at all the spark plug ends to be sure that the coils can produce enough spark and deliver it to the plugs. Repair anything found and make sure there is no corrosion on the coil towers and/or spark plugs. Also inspect the plug wires to be sure insulation is not ripped or torn and be sure the heat shields have not burned a hole in the spark plug boot which all can leak the spark to ground. Remove all spark plugs and inspect them. Look carefully at the ceramic or white portion of the plug. You will be looking for cracks, corrosion, carbon tracking, or bad electrodes. The carbon tracking and cracked ceramic would cause this. Carbon tracking looks like lightening on the ceramic but black in color. Replace if you find any of this. The other is to look for a vaccuum leak especially around the intake area and the supercharger to intake area. I would also be interested to know if you are losing coolant. There is a gasket under the supercharger that allows coolant up to heat the throttle body and it is a known leaker. It would not leak vaccuum, but a small amount of coolant into the intake which used to cause an intermittent misfire and a MAF code. Have a look and if you suspect, take the supercharger off as it is not a big job. Good luck.
2007-09-08 03:58:01 · answer #2 · answered by Deano 7 · 0⤊ 1⤋
Hello! If I remember correctly P0102 is a MAF code, so if you have replaced the sensor already a couple of other things to check out are poor pin tension where the sensor plugs in, also check for a wire broken inside the insulation (usually happens where the wire goes into the connector at the sensor.) Check this by unplugging the sensor and holding the plug in your hand then pull on each wire individually, if you find one that the wire feels like it is stretching you have a broken wire. One other thing to check is anything inside the air cleaner box that may have gotten on the MAF screen. I have seen a few cars that rodents have actually eaten through the air filter and the debris from this has gotten on the screen.
Hope this helps! Good luck!
2007-09-07 17:38:21 · answer #3 · answered by Ham_Samich 2 · 0⤊ 1⤋
I own a shop, and I will tell you what the problem is, because I have seen this a few times. The Mass Airflow Sensor is bad. A quick easy test I use is this; with a medium size screwdriver, hold it by the blade end, and use the handle to rap on the sensor (with the engine running) and I'll bet it goes dead as soon as you tap it. Change the sensor, and the problem will be solved.
Glad to help out, Good Luck!!!
2007-09-08 02:25:51 · answer #4 · answered by Anonymous · 0⤊ 0⤋