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LS Idle problem please help


V8supra

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Got a buddy with a LS1 Trans Am 6 speed car. Says its built(who knows if it really is) Says when you start the car it idles rough then surges then tachs like 7k before it idles back down.

 

Someone told him its the idle air control sensor...

 

Do you guys have any idea what it could be. The OBD2 port dont work so we cant get any codes

 

Any & All help would be greatly appreciated thanks

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thats what I am thinking lol

 

here is what I know for sure is done to car

Fulley Rebuilt motor

arp bolts

Aftermarket Pushrods

Behive Springs

Roller Rockers

really thats all I honestly know of besides stage 1 clutch(as he put it)

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I'm willing to bet theres no power at the OBD2 port, so check the cigerette lighter fuse and see if you can get codes. That would be a good place to start. I doubt the IAC valve is bad, as I'd be looking for vacuum leaks or a hanging throttle.
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I was figuring on hung throttle or vacume leak. I will check the fuses.

 

 

Dude is trying to trade it to me for a S10 I have its a nice car and all the stuff I listed above he has receipts for (heads have work also) but yea. Im going to look it over later.

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Might want to try 're learning' the IAC (idle air control valve)

 

I had weird idle issues after I finished my swap, the IAC was not calibrated.

 

To calibrate it, unplug the valve, then key on (do not run the engine) for some time (30 secs just to be sure) then key off.

 

Plug the sensor back in, Key on for a few seconds then start it up. the IAC should be calibrated at that point.

 

might fix the issues and is easy enough to try.

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looked at said car it had a big bunch of hack job(someone cut vacumes I fixed so I could hear motor right it was knocking in bottom end(So I figured it was so someone couldnt hear long enough to hear bottom end knock)
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