89 Lx 5.0 over reving while not under load?

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May 25, 2006 | 12:54 PM

#11

88GTCOBRA

CMOC Rookie

Joined: Oct 2005

Posts: 94

From: Ontario

IAC Cleaning and service.

Have big nick clean and service your IAC.. 99% sure thats what it is...

May 25, 2006 | 01:01 PM

#12

Scones

CMOC Elite

iTrader: (2)

Joined: Dec 2004

Posts: 1,775

From: Halifax, Nova Scotia

I had a similar problem with the 86 forever, and it actually cost me my idle pass on an etest. I finally tracked it down to the old salt and pepper shakers....

http://fordfuelinjection.com/index.php?p=85

May 25, 2006 | 04:43 PM

#13

Ponyryd

CMOC Elite

iTrader: (5)

Joined: Mar 2006

Posts: 1,531

From: Windsor

Quote:

Originally Posted by capncobra5.0

again with the RPM problems on here...lol....could be a sensor, or maybe the IAC valve (try cleaning this) although if its only doing it when the engine is warm then maybe your looking at a head gasket, see what some of the other guys say but if you want to check your head gasket, spray some WD-40 around the engine close to where the gasket is and see if your engine rev's up....also maybe timing, cause you did replace rotor and cap, so that could be screwy....good luck

^No offence, but this is NOT the way to check for a head gasket leak, you spray a combustible fluid around the INTAKE gasket to check for vacuum leaks.
Regarding you idle problem, could it be a sticky throttle/trans kickdown cable? When it's doing it, try manually closing the throttle, or you could disconnect the cables from the throttle body and see if it clears up. It could also be a partially siezed throttle plate (not very likely). If this is not the problem, and you've already replaced the t.p. and iac, it sounds like it's gonna have to be looked at by a reputable shop, if you're close to Nick, go there.
Btw...welcome! :