i.a.c

[KReePiN]

in a 89 5.7 tbi motor........what would be symptoms of a bad aic?

 

[TylerZ281500]

funny idle, possibly stalling? why whats your truck doing.

 

[iEnding]

funny idle, possibly stalling? why whats your truck doing.

Mine had same symptoms plus a slow reaction time and sometimes not starting

 

[KReePiN]

and when im cruising doing like 30 to 40 mph......under steady light constant throttle......rpms jump up and down a few hundred rpms.....constantly up down up down......almost as if its weird....almost like its pulsing...and during cold startups when i put it in gear it chokes out for a few seconds like it wants to die....then it comes back to life again.....i have brand new everything...plugs ..wires...cap...rotor....everything smog is new...02....egr valve and solenoid.....new fuel pump and filter as well....

 

[iEnding]

Mine jumped around like crazy an wanted to shut off so it would drop rpms then shoot up

 

[95Escahoe]

You can try cleaning it too

Sent from my HTC One X using Tapatalk 2

 

[TylerZ281500]

mines been doing that too, havent driven it lately so dont know if it still does, only thing i havent replaced is the trans lockup tingy

 

[shelbyt.67]

Check out post fer detailed info. IAC info is about 7 paragraphs down. Reseting the IAC is super easy.
http://www.gmt400.com/forum/showthr...rmance-Toolbox&p=264596&viewfull=1#post264596

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[TylerZ281500]

hmm makes a little sense but some uncertainties

 

[KReePiN]

just installed a new iac and throttle position ......problem went away.....for now anyways....