[s10quinn]

My 86 s-10 with its newly installed 87 2.8 idles at what I'm guessing 3000 rpm most of the time. The new motor came from a wreck. I got to run the motor and did not experience this. The ENTIRE motor was swapped.

Sometimes it will start at proper RPM, wait 30 seconds and then up it goes, real fast.

I tried installing the old temperature sensor by the thermostat in case it needed to be synced with the 86 computer. no change.

I'm quite sure I have all vaccum lines properly routed.

Is this an 86 computer to 87 motor incompatibility?

There has been one or two times so far that I could drive for half an hour at low RPM and I think things have settled down, then I come to a stop light and up go the revs for no reason at all.

I need some true direction on this one so I don't run around replacing expensive sensors for no reason. PLease help.Thanks.

 

[s10quinn]

I see, that makes alot of sense. Does this mean I change it? If so, how? Messin with anything TBI is beyond me. I'm a 4 barrel kinda guy.

 

[s10quinn]

Nice play by play, greatly apreciated. By the way, for whatever reason, the high rev, low rev has stopped....i think, tommorows 1 hour drive to work will confirm this.

Question: I power washed the motor when I got it. I bagged the fuel ports really well but not the connection for the IAC.

This motor did not rev high when I got it from the wrecker.

Could this have been the problem? Wet connections?

 

[s10quinn]

Thanks for helpin a fellow BC Bum. Y

ou backin' the Olympics? I'm in.

Thanks again

 

[s10quinn]

Moving to a new thread

I have another problem to still solve and I think should start as another thread,hope you can help me there as well.

quinn