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Old 11-27-2008, 09:09 PM   #1
Slow03
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SVT Crazy Idiling when stopping and weird starting problem.

OK heres the deal. Whenever I am cruising in uetral to a stop the car will be idiling normal, then rev to about 1100rpm and dip to about 700 or 600rpm. It does it all the time. I have yet figured out whet in the world it is.

The car did it when it was stock. I figured a full metal tb would fix the problem but it didnt. Only thing differnet on the intake side is a 65mm tb and a CAI.

Anybody have any ideas on what it could be?


To the next problem, whenever the car has sat for a while it takes a little while for the car to start up. I notices it more often when it got colder outside. So I decided to get a new battery. Put the new battery in. After that it seemed to help a little bit but did not cure the problem. I also put a grounding kit on the car, but I did that a long time ago.

Any ideas?


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Old 11-27-2008, 11:53 PM   #2
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I would check out the idle air control valve. Sometimes these get gummed up and stick or just get worn out. A bad one will cause the sypmtoms you are having and apparently its pretty common for them to go out on Foci. Seem to be a lot of problems on the boards here with them. I know when I did a wire tuck on my cars engine I accidentally got some solder down the throttle body and it found its way into the IACV. Ran great but wouldn't idle afterwards. Had those same symptoms. Took the IACV off, jiggled it a bit and that solder fell out.... Ran great ever since.
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Old 11-28-2008, 02:44 AM   #3
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tps or bad o2 sensor.
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Old 11-28-2008, 07:49 AM   #4
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i have this same problem but here is the weird thing. If im cruising in neutral it will rev up to about the same rpm and dip to about the same UNTIL i come to a complete stop and then it idles like a champ. i have no idea.
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Old 11-28-2008, 05:24 PM   #5
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My SVT idles fine but the start up is a little delayed. I got my battery and starter checked and ford told me there were no problems so i left it. Before i bought my car though i read a whole bunch of reviews from car magazines and online car sites and a few of the reviews said that the car took a little while to return to idle.
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Old 11-28-2008, 06:45 PM   #6
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vacuum leaks? any CELs? any misfires? but i agree with jetrinka.. most likely ur iacv is gunked up.. it will definitely affect both your starting and the over-revving when you dip the clutch..

as for your cold start up problem.. i think of engine oil viscosity.. u are using the recommended grade and type right? ie the one ford says to use.. i believe the foci are quite particular about the engine oil thats in them.. it maybe too thick and of course the colder it gets, the thicker itll get... this can cause problems on start up.. donno, just an idea..
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Old 11-28-2008, 06:54 PM   #7
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-I do have a checkl engine light but it is from the ORP. Car had these symptoms before ORP install though.

-I am using Mobil 1 fully synthetic 5w-30

-O2 Sensors are good. Front one is brand new.

I was thinking it could be the TPS but the IACV never crossed my mind. Where exactly the the IACV located on the SVT. Same area as the regular ZX3?

Also if the IACV is dirty what do you all recomend cleaning it?
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Old 11-29-2008, 02:13 AM   #8
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id put money on the TPS going out before the IACV....its located on the throttle body facing the battery
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Old 11-29-2008, 08:38 AM   #9
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I'm going to go with everyone else on this but also, is your car tuned? You could have an issue with your stock tune.
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Old 11-29-2008, 09:47 PM   #10
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Car is not tuned yet. Will be soon though. You think I should wait to replace anything until I get the tune?
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