95 GT Engine speed rises in between shifts

[95DropTop]

Anyone know what would cause my engine speed to rise in between shifts?

I have to push in the clutch, wait a few seconds, and then shift to deal with it.

It is pretty annoying.
It has been doing this since I got the car, prior to any of my mods. The only existing mod that was done was a cold air intake. The guy before me did that.

Any advice or help is most appreciated.

[White5.0]

bad TPS or IAC maybe??

[95DropTop]

Yeah, that would make sense. I put those things onto my new 65mm throttle body.

[Killercanary]

As was said, check the IAC. The TPS shouldn't be a problem because unlike the fox bodies, the 94-95 takes the voltage at startup as a reference point, so setting it to the normal .99 volts isn't really an issue unless its WAY off. Usually you can't adjust it on a 94-95 anyway as the holes are not slotted to move the sensor. This is a fairly common occurrence as well for these cars.

[95DropTop]

As was said, check the IAC. The TPS shouldn't be a problem because unlike the fox bodies, the 94-95 takes the voltage at startup as a reference point, so setting it to the normal .99 volts isn't really an issue unless its WAY off. Usually you can't adjust it on a 94-95 anyway as the holes are not slotted to move the sensor. This is a fairly common occurrence as well for these cars.

Thanks. I did replace both the TPS and IAC. I did not do anything to set the TPS... I just bolted it on. Not sure exactly how to set it anyway.

But I do know this... the problem did not get any better -and- I have heard that about the bastard children - that they can have this issue.

Do you think a dyno tune will take care of it?

[fork5o]

good post, ive had the same problem too. swapped TPC and IAC and stil the same problem. revs up 300-400 rpm when i push in clutch. ive been thinkin cam since i heard without a tune they can do that and i have no idea whats been done to the internals

[Killercanary]

The TPS generally doesn't need set in a 94-95 since the EEC takes a reference voltage at startup and uses it as its baseline. I'm sorry that your problem isn't fixed... I don't know what else to try off the top of my head. A tune may not solve it either especially since this is a driveability issue and most tuners lack the knowledge to fix such problems on the 94-95's. I'd send Don LaSota an email at LaSota racing and ask him if he thinks a tune could fix it. He is a great guy that I have known for years and he knows his way around the inner workings of a 94-95 EEC.

[yeahloh95]

Mine Had It Too But Did Get Somewhat Better With My Tune

[95DropTop]

Has anyone seen this by chance? I would like to get opinions as to whether this sounds like it is valid information prior to me trying it out.

http://www.moddedmustangs.com/forums/5-0-mustangs/44747-5-0-base-idle-reset.html