Stutter then massive power loss. P0102.

nimrod.sixty9 · May 15, 2013

So Im rolling 70 or so then I feel a small stutter. Thinking it was just the rough road I continue to drive. Did it once more about 5 minutes later. Then, complete loss of power. Trunk is cruising like its off but I have around 1000 RPM that doesn't respond to the throttle. Drop it in neutral, and try to rev with minimal response. Shut it off, turns over a few cycles and then fires and runs fine. Continuing on the way home, I noticed SES, checked code and it shows MAF low circuit P0102.

Cleared code to see if it would show back up. After another 30 minutes of driving my way home, no issues or SES.

I dont want to get stuck on side of the road in BFE, so what would you do?

99 Yukon 2WD

SunlitComet · May 15, 2013

ensure the harness and connector and terminals for the unit is clean and unbroken. in most cases it means the an intermittent failure of something. i have seen this happen at wot with a restricted intake ans well as when an engine backfires internally from valve or fuel related issues. at ide you should see on a scanner 4-7 gram per second at idle and about 100 grams per second of air flow when monitoring the maf just at the point of 1-2 shift at wide open throttle.if you dont see that you have anintake restriction somewhere or the maf is flaking out which is not often.

nimrod.sixty9 · May 15, 2013

SunlitComet said:
ensure the harness and connector and terminals for the unit is clean and unbroken. in most cases it means the an intermittent failure of something. i have seen this happen at wot with a restricted intake ans well as when an engine backfires internally from valve or fuel related issues. at ide you should see on a scanner 4-7 gram per second at idle and about 100 grams per second of air flow when monitoring the maf just at the point of 1-2 shift at wide open throttle.if you dont see that you have anintake restriction somewhere or the maf is flaking out which is not often.

Maybe I should have asked if MAF could have been the culprit of the stutter and power failure. I never went WOT. Can these symptoms happen at throttle as well?

Ill check the wires, but can I safely clean the MAF? Recommendations on that part? Probably the best thing I can do seeing as I dont have a 'scanner'.

I also should have noted that it wasnt just a sputter then restart, it lasted a good minute before I shut it off and turned it back over.

SunlitComet · May 15, 2013

use maf cleaner available at stores. follow directions on can. can happen at any throttle setting out side of idle. once the code is thrown the pcm ignores input from the maf and as a result relies solely on map, tps, coolant and rpm. good info to run the vehicle but in a kind of limpy kind of way. not as good as having the maf input as well tho. when you shut down and restart the pcm effectively reads all sensors again as if nothing is wrong tho the light may will still be on. if all is well for a number of heat cycles the code clears itself and light will turn off. in the case of p0102 3 heat cycles. it will remove itself from the history section of pcm in 40 heat cycles. if it sees a fault again it immediately locks out the sensor again and light is on again.

nimrod.sixty9 · May 17, 2013

SunlitComet said:
use maf cleaner available at stores. follow directions on can. can happen at any throttle setting out side of idle. once the code is thrown the pcm ignores input from the maf and as a result relies solely on map, tps, coolant and rpm. good info to run the vehicle but in a kind of limpy kind of way. not as good as having the maf input as well tho. when you shut down and restart the pcm effectively reads all sensors again as if nothing is wrong tho the light may will still be on. if all is well for a number of heat cycles the code clears itself and light will turn off. in the case of p0102 3 heat cycles. it will remove itself from the history section of pcm in 40 heat cycles. if it sees a fault again it immediately locks out the sensor again and light is on again.

Alright, got the MAF cleaner. Going to give this a shot.

You say it goes into limp mode; then I wonder why it still ran like crap after it lost massive power. Maybe limp mode after restart?

SunlitComet · May 17, 2013

because of the limp mode. if activated it may run with lower performance BUT IT RUNS. THAT IS THE PURPOSE OF IT. it trys to help you get somewhere safely if possible. like off the middle of the road.

nimrod.sixty9 · May 29, 2013

SunlitComet said:
because of the limp mode. if activated it may run with lower performance BUT IT RUNS. THAT IS THE PURPOSE OF IT. it trys to help you get somewhere safely if possible. like off the middle of the road.

Then this wasn't limp mode. This was flooring it and it wouldn't go above 1000RPM.

New, possibly related thread here.

Stutter then massive power loss. P0102.

nimrod.sixty9

Hold on, I got this.

SunlitComet

OBS Jedi-Do Good

nimrod.sixty9

Hold on, I got this.

SunlitComet

OBS Jedi-Do Good

nimrod.sixty9

Hold on, I got this.

SunlitComet

OBS Jedi-Do Good

nimrod.sixty9

Hold on, I got this.

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