Unexplained Limp Mode

haitech · 12-16-2015, 10:24 PM

My friend hits limp mode when he turns on his headlights. ... being serious here

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darkphantom · 12-18-2015, 08:21 AM

Quote:

Originally Posted by haitech

My friend hits limp mode when he turns on his headlights. ... being serious here

Sent from my SM-T320 using Tapatalk

I need to take a look at the TBs and the MAF....blah. Will have to drive to my parents to use their garage >_<

grobie · 12-21-2015, 05:56 AM

Just had the same problem with the so-called limp mode. The day before this happened, I had removed my air filters and washed them out (Nismo Cold Air intake Long tubes). I left them out to dry overnight and installed them the next morning. Went to the post office (Approx 5 miles), car drove fine. Left the post office after about 3 minutes and the car started bucking back and fourth when trying to give it a little throttle. Had to drive home at 20 to 25MPH, car would not go over that. Got it in the garage and tried to rev it in neutral...still would not rev. Car sat overnite, then started the next morning and took her out for a drive...and no issues. Car was fine. No DTC's, lights, etc... Only thing I can think of...is that the filters were not completely dry and she wasn't getting enough air, or somehow moisture worked it's way up the the MAFS and was causing issues??

juld0zer · 12-21-2015, 09:20 AM

Quote:

Originally Posted by grobie

Just had the same problem with the so-called limp mode......

Jerking and bucking sounds like dirty or contaminated MAF/s to me. Clean both MAF sensors using the correct cleaner aerosol and then do a battery reset and go for a drive.

grobie · 12-21-2015, 08:50 PM

Will give it a try. Have not had the issue come back so far....Keeping my fingers crossed!

juld0zer · 12-22-2015, 01:29 AM

For me, i did have the Stillen G3 fitted at the time but i had it on for ages before it started happening. In the end, it was a bug in the throttle map i had loaded with Uprev. My guess is that under the right circumstances, that buggy cell would be called up and the ECU doesn't like it so it reverts to failsafe.

It doesnt log any fault or bring on the engine light because to the ECU, everything is working as it should. The bug probably just calls for an invalid command, like an off the scale response.

12-21-2015, 05:56 AM	#3 (permalink)
grobie Base Member Join Date: Jan 2015 Location: Arizona City, AZ Posts: 19 Drives: 2009 370Z Sport Rep Power: 12	Limp Mode? Just had the same problem with the so-called limp mode. The day before this happened, I had removed my air filters and washed them out (Nismo Cold Air intake Long tubes). I left them out to dry overnight and installed them the next morning. Went to the post office (Approx 5 miles), car drove fine. Left the post office after about 3 minutes and the car started bucking back and fourth when trying to give it a little throttle. Had to drive home at 20 to 25MPH, car would not go over that. Got it in the garage and tried to rev it in neutral...still would not rev. Car sat overnite, then started the next morning and took her out for a drive...and no issues. Car was fine. No DTC's, lights, etc... Only thing I can think of...is that the filters were not completely dry and she wasn't getting enough air, or somehow moisture worked it's way up the the MAFS and was causing issues??

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12-16-2015, 10:24 PM	#1 (permalink)
haitech Track Member Join Date: Sep 2011 Location: Austin/Dallas Posts: 922 Drives: 11' 370z Magnetic M6 Rep Power: 16	My friend hits limp mode when he turns on his headlights. ... being serious here Sent from my SM-T320 using Tapatalk

12-21-2015, 08:50 PM	#5 (permalink)
grobie Base Member Join Date: Jan 2015 Location: Arizona City, AZ Posts: 19 Drives: 2009 370Z Sport Rep Power: 12	Will give it a try. Have not had the issue come back so far....Keeping my fingers crossed!

12-22-2015, 01:29 AM	#6 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 140	For me, i did have the Stillen G3 fitted at the time but i had it on for ages before it started happening. In the end, it was a bug in the throttle map i had loaded with Uprev. My guess is that under the right circumstances, that buggy cell would be called up and the ECU doesn't like it so it reverts to failsafe. It doesnt log any fault or bring on the engine light because to the ECU, everything is working as it should. The bug probably just calls for an invalid command, like an off the scale response.