WOT upon startup
Thread Starter
Racer
Joined: Jul 2001
Posts: 453
Likes: 1
From: Poughkeepsie NY
WOT upon startup
My friend has a 2015 mn7, z51. He told me the other day when he started his car it ran wide open and pinned the tach. He immediately shut it off, waited a few minutes and refired. The car acted normal after that. What could possibly cause that. Pretty scary.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
There are a lot of variables that could cause that to happen. However, the engine should be OK. The Rev limiter kept it from over revving. Even if you hold the gas pedal to the floor with the transmission in neutral it will not over rev.
Bill
Bill
Burning Brakes
Joined: Oct 2009
Posts: 1,004
Likes: 68
From: Cincinnati OH
I've had that happen on mine and attributed it to a combo of the tune and ported throttle body and have been working through the issue. I pick the car up from Vengeance tomorrow and am hoping my little gremlins like that are behind me. Is his car stock?
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Same here every now and then something weird happens--- I just shut if off- restart and it always resets itself and is fine--
I have a ported T-Body as well--It did a few times go to WOT at start up-- But be comforted that there are several engine protection programs in place that help protect your engine--especially when it's cold---RPM limiter---set by coolant temp-oil pressure etc------
I have a ported T-Body as well--It did a few times go to WOT at start up-- But be comforted that there are several engine protection programs in place that help protect your engine--especially when it's cold---RPM limiter---set by coolant temp-oil pressure etc------
Safety Car
Joined: Jan 2006
Posts: 3,940
Likes: 43
From: shavertown Pa.
You should take it back to the dealer so they can download the information from the event.
An event like that can destroy your engine especially on a cold oil starved engine.
If it does happen again you will have proof that the car did it all on its own without modifications.
You want to have some kind of proof that it did it all by itself.
An event like that can destroy your engine especially on a cold oil starved engine.
If it does happen again you will have proof that the car did it all on its own without modifications.
You want to have some kind of proof that it did it all by itself.
Advanced
Joined: May 2014
Posts: 89
Likes: 2
Similar experience but not WOT. Started up the car two weeks ago, first morning start, and it got stuck idling above 1K for about 5-10mins, sounded like a boat engine running. It usually lowers rpm after 2min. But I kept waiting to see if it was going to ramp down and it never did, until I turned it off.
Hmm, maybe this is what caused my faulty cat converter? Dumping too much fuel in
Hmm, maybe this is what caused my faulty cat converter? Dumping too much fuel in
Melting Slicks
Joined: Jun 2012
Posts: 2,226
Likes: 1,029
From: Thomas Texas
Mine did it yesterday at a car show. Lots of people standing around as a witness. They must have thought I was an idiot reving my engine after the show was over.
I tried blipping the throttle but it didn't help. Made it worse, actually Shut it off after about 4 seconds. Restarted and it ran normally. I just idled away without touching the gas pedal.
Has to be a bug in the software controlling the throttle blade. Could be on start up the ECU gets a false reading from one of the TPS, MAP or MAF sensors. The only thing I can think of to prevent it is to keep your foot away from the gas pedal for a couple of seconds. I would think there would be a fail safe line of code to limit RPM on start up until all sensors stabilize. Makes no sense that RPM instantly goes 6000 rpm. While I did not look a the tach, it was way up there.
To compound matters, the exhaust was extremely loud as I was parked in one of those street type shopping malls and the sound just bounces off the buildings. My NPP was open and I have headers too. I just installed a ported throttle body. I can't believe that has anything to do with it.
I tried blipping the throttle but it didn't help. Made it worse, actually Shut it off after about 4 seconds. Restarted and it ran normally. I just idled away without touching the gas pedal.
Has to be a bug in the software controlling the throttle blade. Could be on start up the ECU gets a false reading from one of the TPS, MAP or MAF sensors. The only thing I can think of to prevent it is to keep your foot away from the gas pedal for a couple of seconds. I would think there would be a fail safe line of code to limit RPM on start up until all sensors stabilize. Makes no sense that RPM instantly goes 6000 rpm. While I did not look a the tach, it was way up there.
To compound matters, the exhaust was extremely loud as I was parked in one of those street type shopping malls and the sound just bounces off the buildings. My NPP was open and I have headers too. I just installed a ported throttle body. I can't believe that has anything to do with it.
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