New (reman) Throttle Body. Won't run and backfires like a bad timing chain. FIXED!

[Harold Crumbie]

Hello....
I put a reman TBi unit on my 1994 Suburban K1500 5.7 today. It was REALLY hard to start, then it ran ok for a bit. Put it in gear to do a driveway test ( I have a REALLY long driveway ) and it died. On restart it was bucking and backfiring like it had slipped a timing chain. I shut it down, checked all the vaccuum and wiring, all was fine. So I swapped back in the old unit (bad bushings, all the rest works fine) and it fired up and ran great, just the crappy hard to smash throttle due to the bad bushings. What did I do wrong, or did I just get a lemon reman unit?

 

[Dover]

Did you do the relearn on the IAC?


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[Harold Crumbie]

I'll go see if I can learn how to relearn. LOL! Thanks.

 

[Dover]

Lol I have done it but don’t exactly remember the steps, search for IAC relearn here and it should come up.


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[PlayingWithTBI]

This is old but works on ours too.

 

[1ton-o-fun]

Glad I decided to read this. I wouldn't have thought that I had to do the relearn step...

(Love this site! You guys are great!)

 

[Harold Crumbie]

Awesome... a paper clip saves the day again.
Plugged "gm 350 tbi base idle" into a browser and followed the directions.
Now my gas pedal works again!

Thanks all.

 

[Dover]

That’s what I love about the TBI system personally. Enough computer to keep it reliable but can still work on it in the driveway without a PHD.


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[badco]

Weird ive never had to relearn a throttle body truck. I do make my factory regulator adjustable on all them and makes a big difference. Also use pump from 96 and they last 10x longer. Last one i did has been going 12yr now.