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87 Chevy 350 throttle body almost stalls?
I just got done restoring an 87 Chevy 1/2 ton pickup with a 350 throttle body. It has been sitting for 2 years periodically being idled and run up and down a street....and I have now begun driving it and have put 50 miles on it.
The engine is a stock 350 TBI with 140,000 miles on it. Only tweaks are headers, eliminated air pump and cats, new plugs and wires, new radiator, and tranny lines. Truck seems to run good and has good oil pressure and temp....my only issue is after running it pretty good for a decent distance and coming to a stop or idle, the truck starts bogging out and sounds like its cammed and about to stall and i rev it to keep it running....and then after like 5-10 seconds it returns to a normal idle.....but I have to always put it in park to keep it wound up ( automatic ). I am also getting an engine light after driving around for a few minutes but I assumed it had something to do with the cats and air pump off.
Any simple ideas of what it could be? I know it is a broad statement, but I figured I'd post anyway. I was thinking fuel issue.......btw I am from Connecticut and it hasn't gotten above 30 since I have begun driving it, so maybe that has something do with it.....all though it happens after the truck is warmed up.
I just used the paper clip and pulled up a code 12 and 13. Apparently 12 is nothing and 13 is for an open o2 circuit. In closed loop would that cause the truck to run rough, would the computer control fuel with a basic reference value? I know a lot of people with TBI trucks around this year that took off all the emissions stuff and don't have issues.
5 Answers
- monkeyboyLv 71 decade agoFavorite Answer
While the ECM's are quite "dumb" on this year vehicle, they still are looking for certain things to happen at certain times. It's a bad idea to remove any factory devices from it for that reason.
That being said, pull the code. It's very simple, just google "OBD1" "GM" "paperclip" and you'll find the process. I suspect EGR as well, it's pretty common for them to stick. Also check for vacuum leak at TBI to intake gasket. A known weak point on these setups.
- CactiJoeLv 71 decade ago
When you take off some of the emissions things then there's always a problem with the ECM making adjustments to timing when the engine gets hot and goes into the closed loop mode where the computer starts making adjustments to the fuel air mix and distributor timing.
So, you might have to fool around with the distributor to see if you can run the truck without the ECM doing any functions. But pull the engine codes first to see what the computer tells you is wrong and then go from there.
Good Luck!
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