When car starts, idles to almost kill... - Mustang Evolution

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Old 07-24-2008, 08:02 AM   #1
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When car starts, idles to almost kill...

When I start my car in the mornings or evenings (car hasn't been ran all day) the car idles from typical 850 rpms or so, to about 100 and almost kills, then lifts up and goes down. This only happens if the car has been sitting half a day or so or longer. IE: yesterday I drove the tC to work, so when I came home, i hopped in the mustang. started it up starts fine, but when it planes out to idle it almost kills, throw it in reverse, it dredges down again. Throw it in First, dredges down until i hit the gas to start going then it goes away. Any ideas?
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Old 07-24-2008, 08:03 AM   #2
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Re: When car starts, idles to almost kill...

Driver error.
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Old 07-24-2008, 08:05 AM   #3
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Re: When car starts, idles to almost kill...

can't be driver error if its chillin in neutral and me not in the car...
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Old 07-24-2008, 08:07 AM   #4
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Re: When car starts, idles to almost kill...

That's your error, you're not in the car.

And, when you get in the car, that's your error as well.

You're pretty much at fault either way.
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Old 07-24-2008, 08:08 AM   #5
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Re: When car starts, idles to almost kill...

What cam does your car have?

Edit, I see you have the B cam. I was thinking it was just the cam getting back into timing. Actually...I would check my timing to make sure the computer's not trying to pull timing at idle. It might be pulling/adding unnecessary timing. Start it cold one day and watch timing with a timing light, You may can find out what's going on.

Either that or your car just sucks.
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Old 07-24-2008, 08:09 AM   #6
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Re: When car starts, idles to almost kill...

It's a mild cam, thinking something along the lines of a B303
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Old 07-24-2008, 08:10 AM   #7
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Re: When car starts, idles to almost kill...

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What cam does your car have?
we don't know for sure...we can only base it on what the guy told us since he never produced the paperwork for the work. It's pretty mild though. Nothing aggressive enough to make this a normal behavior.
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Old 07-24-2008, 08:11 AM   #8
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Re: When car starts, idles to almost kill...

Hey rob, you know the black GT we looked at, remember how it was doing that? I'm thinking it's bad tune.... lol
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Old 07-24-2008, 08:14 AM   #9
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Re: When car starts, idles to almost kill...

Your tune wouldn't have all of a sudden gone bad. The black one did it cold and warm and had a much more aggressive cam if I remember right.

It's probably your IAC or there might be a vacuum leak somewhere....or your fuel pump is being a *****. Hard to say right now as it is only 8:15 am.
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Old 07-24-2008, 08:15 AM   #10
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Re: When car starts, idles to almost kill...

oh i know tune didn't go bad over night, just trying to think of things. Hmmm...
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Old 07-24-2008, 08:16 AM   #11
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Re: When car starts, idles to almost kill...

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Originally Posted by PureVenom View Post
Your tune wouldn't have all of a sudden gone bad. The black one did it cold and warm and had a much more aggressive cam if I remember right.

It's probably your IAC or there might be a vacuum leak somewhere....or your fuel pump is being a *****. Hard to say right now as it is only 8:15 am.
Hell it's late man. In another 20 minutes my day gets easy.
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Old 07-24-2008, 08:18 AM   #12
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Re: When car starts, idles to almost kill...

getting 5.0's to idle right with a cam is not fun or easy~ ask bbunt302 he knows.... pm him if he doesnt reply soon and ask him about it.
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Old 07-24-2008, 10:10 AM   #13
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Re: When car starts, idles to almost kill...

yea i may send him a pm
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Old 07-24-2008, 12:32 PM   #14
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Re: When car starts, idles to almost kill...

try fixing your fuel problem first since it is already tuned.
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Old 07-24-2008, 05:09 PM   #15
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Re: When car starts, idles to almost kill...

We had a similar problem on a 03 gt. We replaced the IAC 2 times and it turned out he was messing with the screw on the bypass valve.That would be a place to check for problems.
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Old 07-24-2008, 07:16 PM   #16
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Re: When car starts, idles to almost kill...

Don't send me a PM. Try resetting your idle. Google "5.0 base idle reset".

There's a million other things you can do to try and help. Chances are, none of them will help. After trying them all in vain, go have your car tuned.
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Old 07-25-2008, 08:21 AM   #17
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Re: When car starts, idles to almost kill...

im guessing my post was looked over, it does not a bit of good to try to diagnose an idling problem or have the car retuned until the massive fuel leak is found, the inside of the car smells like a gas jugg when the car is running, it is very clear there is a fuel problem, i suggest fixing the known problems before looking for new ones.

as far as idling a 5.0 with a cam, im not sure why this is a problem, he have done many 5.0s and even without a tune, the a9l computer idles the car fine after about 30 seconds.
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Old 07-25-2008, 08:30 AM   #18
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Re: When car starts, idles to almost kill...

Okay got a question for ya Jarrod. Since I think that manifold is coming undone, and I'm getting the great tractor sound from the engine aka exhaust leak, the fuel smell went away... completely.
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Old 07-25-2008, 08:33 AM   #19
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Re: When car starts, idles to almost kill...

umm, probably means the car is very rich and the fuel smell was coming from the dumps, we need to get that FMU off of it, and actually tune the car so we know what its doing.
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Old 07-25-2008, 08:36 AM   #20
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Re: When car starts, idles to almost kill...

That's what I'm thinking. I have 0 fuel smell now. Just... CHUGGA CHUGGA CHUGGA tractor sound off the right side of the manifold it sounds like (passenger side). I can tell its somewhat bad cuz the exhaust is a LOT quieter now.
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Old 07-25-2008, 08:53 AM   #21
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Re: When car starts, idles to almost kill...

i dont reccomend driving it until we fix it, and if u still have manifolds on that car, you need to look at longtubes...
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Old 07-25-2008, 08:56 AM   #22
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Re: When car starts, idles to almost kill...

well i have shorty hookers...

any word on dyno operations (i saw your post and talked to ya last night), should I drop my car off over there?
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Old 07-25-2008, 09:00 AM   #23
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Re: When car starts, idles to almost kill...

no wrod on the programs yet.let me see if i can rack it tonight, if so we will do the exhaust
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Old 07-25-2008, 09:07 AM   #24
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Re: When car starts, idles to almost kill...

Okay, do you want to trailer it over there, or take the drive?
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Old 07-25-2008, 09:09 AM   #25
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Re: When car starts, idles to almost kill...

dont matter
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Old 07-25-2008, 09:11 AM   #26
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Re: When car starts, idles to almost kill...

taking a trailer to it means using ur truck and trailer... and me buying you a case of beer. lol, me driving means, well, ill be there at the snap of a finger
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Old 07-25-2008, 09:30 AM   #27
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Re: When car starts, idles to almost kill...

dont drink beer, but my truck drinks 89 octane
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Old 07-25-2008, 09:31 AM   #28
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Re: When car starts, idles to almost kill...

im supposed to install my axle, and wire my bottle heater , and get 2 bottles filled before hooters tonight, and possibly install a wideband in my car.got alot to do...might just get you to drive it.
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Old 07-25-2008, 09:32 AM   #29
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Re: When car starts, idles to almost kill...

thats fine
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Old 07-25-2008, 09:33 AM   #30
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Re: When car starts, idles to almost kill...

ill drive it by
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