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LT1 idles at ~2000 rpm


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Hi

 

I just got my LT1 conversion on the road this morning so I went up and down the block and it is AWESOME !

It runs really smooth and strong...

But, it is idling way too fast, I checked all the vacume connections I can find EGR, Brake booster etc and they are all blocked off or connected to somehting.

I have LT1 edit and it is complaining about the VSS signal (code 97) and that the check engine ligt is not connected (code 11) which it is correct.

I have disabled the EGR etc in the PCM.

 

Does anyone have any other ideas ? I expect it is some thing dumb I have done becasue it is working like a dream otherwise.

 

Any thoughts appreciated.

 

Thanks Mike

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  • 2 weeks later...

Is this a stock motor?

 

Are you sure your throttle cable is not binding? Also check to make sure your IAC motor is hooked up right. I had mine hooked up wrong and mine ran great under power but at idle it ran at like 1500RPMS.

 

 

Guy

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Pull the IAC and clean it. Don't push, pull or twist teh plunger though.

I used some Throttle Body cleaner (I couldn't resist buying it since it had a picture of the LT1 TB on the can). Then I lubed it with Dry lubricant spray.

Also, connect up your VSS from the trans to PCM...it needs that signal. If you need to reset the IAC, hold the accelerator pedal down 1/4 way, start the engine and run for a few seconds. Switch it off. Then start as normal. This will reset the IAC motor.

 

Look at this site. It is invaluable as a resource. I have copied the entire site to my PC incase it goes away. It's written by THE resident expert on CamaroZ28.com

 

http://shbox.com/1/4th_gen_tech1.html

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