ecm problem

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10-26-2009, 08:42 PM
2000gmc

ecm problem

hey guys i need a bit of help. my ecm on my truck will read my maf sensor and then some time lose it. i already replaced it twice and put a new connector. i troubleshooted each wire back to the ecm and the the fuse(eng1),thiers is no open circuit on the wires.is their anything else that can be bad. i believe that my ecm is going bad. last week when i got it retune the sensor was not sending a signal to the hptuner i had already replace the sensor two week prior. so we replaced it again and it started to show up on the tuner. but the next day before i headed to the track check engine light came on again. checked the codes an it was the maf sensor again. po102 is the code its giving out. can it be a bad ecm or something else. thanks for help.
10-26-2009, 08:47 PM
RedHeartbeat

did you get a live tune from someone? P0102 is the code we turn off to turn the MAF off so we can speed density tune the PCM, if I remember correctly.
10-26-2009, 08:50 PM
2000gmc

Quote:

Originally Posted by RedHeartbeat

did you get a live tune from someone? P0102 is the code we turn off to turn the MAF off so we can speed density tune the PCM, if I remember correctly.

according to the guy that tunes it he said that i need the maf so am assuming that its not turned off. should it be?
10-26-2009, 08:51 PM
RedHeartbeat

Flaco? I know he knows how to tune. Just wondered if he turned it off and forgot to turn it back on.
10-26-2009, 09:14 PM
2000gmc

Quote:

Originally Posted by RedHeartbeat

Flaco? I know he knows how to tune. Just wondered if he turned it off and forgot to turn it back on.

ill ask him. but this problem stared after i had install an msd inline fuel pump. but it had been a week before that i had taken it to tune it. but what if its on could it be a bad ecm.
10-26-2009, 09:19 PM
RedHeartbeat

did you put too small of a pump in there and now its running lean? Have you checked the fuel pressure? The worst thing you can do to a good tune is make changes to the engine or fuel delivery.

If it was fine before you swapped the pump, you may be the variable that affected the tune.

How did you power the pump? The factory fuel pump wire cannot carry the load of a performance pump and it surely can carry the power load of the factory plus a booster pump.
10-26-2009, 10:25 PM
2000gmc

Quote:

Originally Posted by RedHeartbeat

did you put too small of a pump in there and now its running lean? Have you checked the fuel pressure? The worst thing you can do to a good tune is make changes to the engine or fuel delivery.

If it was fine before you swapped the pump, you may be the variable that affected the tune.

How did you power the pump? The factory fuel pump wire cannot carry the load of a performance pump and it surely can carry the power load of the factory plus a booster pump.

its a msd inline pump. it has its own relay on it. i did tap into the gray wire on the hardness so the pump will turn on with the stock pump. but the pump is power from the battery with a 12gauge wire. relay is next to the pump. when he did the retune i was not losing pressure anymore. due to the fact that it was leaning out after 5,000rpm. cause i was losing pressure.