89 Lx 5.0 over reving while not under load?

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05-25-2006, 12:54 PM

#11

88GTCOBRA

CMOC Rookie

Join Date: Oct 2005

Location: Ontario

Posts: 94

IAC Cleaning and service.

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

05-25-2006, 01:01 PM

#12

Scones

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Join Date: Dec 2004

Location: Windsor, Ontario

Posts: 1,775

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

05-25-2006, 04:43 PM

#13

Ponyryd

CMOC Elite

iTrader: (5)

Join Date: Mar 2006

Location: Windsor

Posts: 1,531

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! :