Car dies when hitting rev limiter?
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Car dies when hitting rev limiter?
Hey guys my 2001 c5 has been dying when it hits the rev limiter in gear. not an abrupt stall but it slowly revs down and doesn’t take any gas no matter throttle position. the car did not do this before my tune for my cam. what could be causing this? my tuner said he’s never seen a car do that before. injectors are at 90% duty cycle at WOT
Drifting
Joined: Jul 2004
Posts: 1,675
Likes: 689
From: Pingree Grove IL
Do you have an automatic transmission, if so set the shift RPM from 1st to 2nd gear down 100RPM. The computer can’t tell the transmission to shift fast enough because it’s a Nintendo type computer in the car. That might help it from bouncing off the rev limiter.
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Yes it is an auto, the car shifts in time in normal drive but when i have it in manual mode and hits the limiter is when it dies. it shifts by itself fine
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Safety Car
Joined: Aug 2011
Posts: 4,449
Likes: 409
From: Portland OR
Manual mode?
The 4L60 will do the 1-2 manually no problem.
The 2-3 however is a problem.
As soon as you move the lever to 3, the PCM follows the WOT shift tables. If too close to the table RPM, the trans doesn’t have time to do the shift and says FU, I’m hitting the rev limiter.
As to why it dies I have no idea.
The 4L60 will do the 1-2 manually no problem.
The 2-3 however is a problem.
As soon as you move the lever to 3, the PCM follows the WOT shift tables. If too close to the table RPM, the trans doesn’t have time to do the shift and says FU, I’m hitting the rev limiter.
As to why it dies I have no idea.
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
....only it does not really die.....just a novice explaining what happens when the PCM pulls timing/cuts fuel.....and will not accept any more throttle input.
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Manual mode?
The 4L60 will do the 1-2 manually no problem.
The 2-3 however is a problem.
As soon as you move the lever to 3, the PCM follows the WOT shift tables. If too close to the table RPM, the trans doesn’t have time to do the shift and says FU, I’m hitting the rev limiter.
As to why it dies I have no idea.
The 4L60 will do the 1-2 manually no problem.
The 2-3 however is a problem.
As soon as you move the lever to 3, the PCM follows the WOT shift tables. If too close to the table RPM, the trans doesn’t have time to do the shift and says FU, I’m hitting the rev limiter.
As to why it dies I have no idea.
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
But the weird part, if i have it in say 3, and it “dies” (slowly revs down doesn’t accept throttle). it then shift into D, the car dies completely and loses all battery etc
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
I have no clue lol that’s why i need yalls help, the tuner said he had no clue what’s causing it and he couldnt get it to not do it, at first it would do it in P/N too but he fixed that, but couldnt resolve when it would do it in gear
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
I'd say! OP-there is a possibility that the tuner still has your original tune. If he does, have him upload it back into the PCM and see if that cures it. If it does, as someone mentioned earlier, it's in the new tune. As also mentioned, if the tune is the issue, it's time for a new tuner...
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
Thread Starter
Instructor
Joined: Aug 2024
Posts: 104
Likes: 10
From: Alabama
I'd say! OP-there is a possibility that the tuner still has your original tune. If he does, have him upload it back into the PCM and see if that cures it. If it does, as someone mentioned earlier, it's in the new tune. As also mentioned, if the tune is the issue, it's time for a new tuner...
Safety Car
Joined: Aug 2011
Posts: 4,449
Likes: 409
From: Portland OR
Got ya on not running on the stock tune file. Mine won’t either. It won’t even start.
I am a tuner, learned on my own C5 starting in 2012.
So let me ask. Is this a speed density tune? Does it have a MAF?
Is your tuner hands on or is this remote tuning?
Did it get on a dyno?
Are there any logs available that caught it in the act?
Maybe talk about all the mods done. And how it behaves in normal driving etc.
I am a tuner, learned on my own C5 starting in 2012.
So let me ask. Is this a speed density tune? Does it have a MAF?
Is your tuner hands on or is this remote tuning?
Did it get on a dyno?
Are there any logs available that caught it in the act?
Maybe talk about all the mods done. And how it behaves in normal driving etc.