Strange RPM drop - Ford Mustang Forum
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post #1 of 3 (permalink) Old 12-13-2015 Thread Starter
5.0L Member
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Joined: Oct 2015
Location: Northern KY
Posts: 61
Strange RPM drop

I've noticed something odd, so when I start the car if you try to rev it while it's in park after it's just started the RPMs actually sharply drop. Sometimes I think it might actually quit, though it never has. Before someone chastises me for doing this, I've only tried it when the engine is warm not on cold starts and I'm not revving it to 7k or anything crazy, just like 2k or so. Is this some sort of automated protection the car has or is there some issue here?

It just strikes me as odd, I've never owned a car that behaved like this. If I wait several seconds, maybe 10-15 seconds then you can rev it like normal. Mostly just want to know if this is something I need to have looked at. I have an auto so I'm wondering, if any of you with a manual try to rev it just after it's started at all does it also dip the RPMs or does it rev as expected?

2013 Silver Ingot GT Premium 6R80
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post #2 of 3 (permalink) Old 12-13-2015
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Joined: Dec 2011
Location: Point Roberts
Posts: 1,741
The car goes through an initial closed loop startup sequence, which you are interrupting. It is a pretty high compression engine running on pump gas. Give it a sec.

2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85

2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP
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post #3 of 3 (permalink) Old 12-14-2015
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Joined: Sep 2014
Location: Long Island
Posts: 124
Its still in its Post Start Enrichment after you cold start it, its adding a LOT of fuel and reducing timing. Let her warm up a little before you start kicking the pedal

Lots of parts. Still slow
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