High engine rev at start up
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Junior User
Joined: Jan 2007
Posts: 54
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From: Southwest Missouri
High engine rev at start up
'99 V10 in F350
Doesn't happen every time. But after it has set for a few days, or over night, as soon as it starts it will rev to about 2-3k, then drop to an idle. This happens pretty quick, in less than a second. Any ideas?
Doesn't happen every time. But after it has set for a few days, or over night, as soon as it starts it will rev to about 2-3k, then drop to an idle. This happens pretty quick, in less than a second. Any ideas?
Fleet Mechanic
Joined: Oct 2004
Posts: 1,394
Likes: 104
From: Southern KS
That was a beef I had with my 99. On cold start up it would rev to 1800-2000 and then settle down to 1200-1300 right away. It just bugged me to see it rev so high on cold start. It did it from day one and it never seemed to hurt it. I sold the truck to a friend who has it over 100,000 miles and it still uses the same 1/2 to 3/4 quart between oil changes.
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
I'd check for vacuum leaks, and then change the IAC.
My '01 revs up to somewhere around 1500-2000 or so (haven't watched it in a LONG time), and then drops right back down.
It revs up enough to torque the entire truck over
My '01 revs up to somewhere around 1500-2000 or so (haven't watched it in a LONG time), and then drops right back down.
It revs up enough to torque the entire truck over
Senior User
Joined: Oct 2007
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From: Alabama Gulf Coast
I have a 2002 and it has done that same thing since day one. It does it every two to three weeks. Its does it on hot and cold days. It usually happens after the truck has sat for a few days.
Senior User
Joined: Jan 2006
Posts: 400
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From: Calgary, Alberta, Canada
Originally Posted by mackstruck
I have a 2002 and it has done that same thing since day one. It does it every two to three weeks. Its does it on hot and cold days. It usually happens after the truck has sat for a few days.
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FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
My '97 Cougar 4.6L does it too - but my '96 T-bird 4.6L (same motor and PCM) didn't.
Go figure.
Go figure.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by UncleD
'99 V10 in F350
Doesn't happen every time. But after it has set for a few days, or over night, as soon as it starts it will rev to about 2-3k, then drop to an idle. This happens pretty quick, in less than a second. Any ideas?
Doesn't happen every time. But after it has set for a few days, or over night, as soon as it starts it will rev to about 2-3k, then drop to an idle. This happens pretty quick, in less than a second. Any ideas?
'99 model here.
I don't know whether it's normal or not, but it hasn't seemed to hurt anything. I do change the oil at 3K and use Castrol GTX 5w30 - no problems with tapping or knocking. Over 130K miles.
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Junior User
Joined: Jan 2007
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From: Southwest Missouri
If it didn't do it so quickly, I wouldn't have worried about it either. But it's like starting it with the gas peddle pressed about half way down, then letting off as soon as it hits.
But it seems like I don't have the only one that does it, and the others haven't had any damage, so it must be a normal thing
But it seems like I don't have the only one that does it, and the others haven't had any damage, so it must be a normal thing
Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by UncleD
If it didn't do it so quickly, I wouldn't have worried about it either. But it's like starting it with the gas peddle pressed about half way down, then letting off as soon as it hits.
