Help--It stays at 2500+ rpms and won't come down!!

[Harrry]

Okay i was installing an upgraded lim on my svt. As soon as i started the car up, it rev'd to 1200 rpms. So aftering look around the engine bay...i started to tackle the vacume lines. Nothing was disconnected, I didn't even hear a hissing sound at all. So i thought i might double check the manifold gaskets again and retorqe them to spec.

So i remove the upper and put 100inch pounds to the screws on the lower. I then reinstall the UIM and connect everything else. Once i connect everything i went to start it and it rev'd to 3k rpms and then idle'd at 2.5k rpms.

For 3 days...i'm stuck!! I replaced all gaskets...uim/lim, egr,tb,iac gaskets.
I took the tps and IAC sensors off my running SE and put them on the svt...and yup problem is still there!!

So i'm ing stuck and i have no ing clue what could be left. Purdysvt stopped over one day and we pressure checked a few lines. We found one to be weezing. that was corrected today. Now i can't find anything that would be causing this!!

So i reinstalled my stock lim and well the problem is still there.


ANy ideas...clues?

 

[Tony2005]

I think this happened to one of the cars at our meet a few years ago. It was the tb. Check the installation of the TPS (upside down, the SE is different from the SVT) and/or the cable (this was what turned out to be the issue in one of our cars, IIRC, it was Platinum Drew's car)

Edit.
TPS installation.
http://www.contour.org/ceg-vb/showthread.php?t=108

 

[striker2]

I think this happened to one of the cars at our meet a few years ago. It was the tb. Check the installation (upside down, the SE is different from the SVT) and/or the cable.

yeah, sounds like the TB isnt quite closed all the way for some reason.

 

[greasemonkey1489]

My car (95 se) was doing this, it had a short at the TPS connector. Dunno if this is a possibility, but just a suggestion. Did you reset the ECU when you tried the IAC from your se?

 

[Harrry]

I replaced my tps with another one i had sitting around from my mustang tb..same problem :blackeye:

Mustang tps was on my car for 2 years till i took it off for this project. I'll grab another tps from a friends svt...

but if that doesn't work....i'm out of ideas.

 

[Harrry]

yeah, sounds like the TB isnt quite closed all the way for some reason.

It does...or the throttle is stuck. As i took it for a drive....hoping the cel would light up....the engine accelerated on its own...and when i pressed in the clutch it was reving way past 5500 rpms...so i just turned the car off.

I think i might go grab a new tps at autozone tomorrow and give that a try. I'll throw on another tb just in case too.

 

[xtascox]

I had the same problem with my Mystique. Searched high and low for vac leaks and anything else that could cause the problem. I ended up having to do the throttle hang fix with the copper pipe cap and the problem went away. A couple months later I pulled the cap out to see if it was still acting up and the car had no problems at all. I guess its worth a shot if your still stuck.

 

[blu_fuz]

My throttle cables use to fray from rubbing on the inside of the casings and my throttle would hang at horrible RPMs and a few times getting on the highway I have had it stick open at WOT. Check the cables if the other options don't work.

 

[Harrry]

I think i found the problem...thanks a lot guys! I'll find out more later today...but last night we got it to idle down to 1k rpms. But i'll do more testing today!