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2005-2010 Mustang GT Tech Forum

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Unread 11-16-2012   #1 (permalink)
MaDDMaNN is offline Apprentice

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Default Cold Start engine rev problems

I am have an issue with the engine rev really high when I start my car in the morning. Yesterday, I started my in 35 degree wheather and the engine rev up to 3000 RPM's. I had to tap the gas to stop the engine from reving higher. I have a 2007 GT running a Bama 93 Performance tune with a cold air intake. Do I need to switch to a less aggressive tune for the winter, or is there some mechanical I need to be looking at. I know it is time for a tune-up, I am right at 90,000 miles.
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2007 Mustang GT automatic in Black:
Airaid Race CAI and SF3 Tuner; Bama 87 Street, 91 Performance, and 93 Race Tune; J&M Rear Upper and Lower Control Arms; Motive 3.90 Gears; Mac Long Tube Headers with Pro Chamber Mid-Pipe and Boom Tubes; Pypes Ceramic Cats; O2 Sensor Raiser Non Foulers.

Future Plans: Lowering, CMDP, Cams.

"If we don't stand for something, we may fall for anything." Malcolm X

Last edited by MaDDMaNN; 11-16-2012 at 04:49 PM. Reason: spelling
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Unread 11-17-2012   #2 (permalink)
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Last edited by gmcmanus00; 2 Weeks Ago at 02:41 AM.
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Unread 11-19-2012   #3 (permalink)
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Quote:
Originally Posted by MaDDMaNN View Post
I am have an issue with the engine rev really high when I start my car in the morning. Yesterday, I started my in 35 degree wheather and the engine rev up to 3000 RPM's. I had to tap the gas to stop the engine from reving higher. I have a 2007 GT running a Bama 93 Performance tune with a cold air intake. Do I need to switch to a less aggressive tune for the winter, or is there some mechanical I need to be looking at. I know it is time for a tune-up, I am right at 90,000 miles.
Quote:
Originally Posted by gmcmanus00 View Post
I would start with checking any and all hoses for security and tightness at the clamps due to the possibility of a vacuum leak. That high of idle seems fairly normal for cold temperatures right at ignition and it should idle down within a few seconds and slowly drop as the engine warms. Would also recommend remaining below 2000RPM until at operating temperature. Another thought - If you have your idle set high in your tuner (if you have one) then the higher the engine will rev at ignition. Stock Idle setting in your tuner should be 740RPM unless you are forced induction.
Hey Madman,

Gmcman has definitely given you some good advice. I would start with giving your car a once over to just to check for vacuum leaks etc.. It's pretty normal for a car to rev high on a cold start with 30* weather. However 3k sounds a little bit higher then normal!

Since you didn't have any issues with the tune until the freezing weather I'm pretty confident its not tune related. However I'd still like to look into the tune to make sure nothing is out of the ordinary! Our tunes are good 99% of the time. Occasionally there are errors because we hand write each tune. I'm confident my Bama team will fix it quickly if there's a problem! Majority of the time, its Small human error when filing your tune information form or by a Bama Member!

Shoot me a PM with your order # included & I'll have my head Tuning Specialist Mike Wilson contact you directly! Hang in there, You'll be enjoying your tunes again in no time.

-Dan
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Unread 01-07-2013   #4 (permalink)
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Default

Sorry it took so long to reply. I finally sat down and checked the hoses; I could not find anything wrong. So then, I switch to the race tune. It seem to cure the problem. The high reving has stopped, and the throttle response is way more controlled. For some reason it was really touchy with the 93 Performance tune. With the 93 race tune, things seem to be working much better for me. Is it possible for the car to respond differently to the winter gas? Anyway, I will just load the performance tune when inspection time comes. I like the race tune better anyway, and I get a little better gas mileage with it.
__________________
2007 Mustang GT automatic in Black:
Airaid Race CAI and SF3 Tuner; Bama 87 Street, 91 Performance, and 93 Race Tune; J&M Rear Upper and Lower Control Arms; Motive 3.90 Gears; Mac Long Tube Headers with Pro Chamber Mid-Pipe and Boom Tubes; Pypes Ceramic Cats; O2 Sensor Raiser Non Foulers.

Future Plans: Lowering, CMDP, Cams.

"If we don't stand for something, we may fall for anything." Malcolm X

Last edited by MaDDMaNN; 01-07-2013 at 03:41 PM. Reason: spelling
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