Thread: 88 Chevy TBI - Hesitating - need help

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How long has this been happening? What has been done to try and fix it? What is the fuel pressure? Have you taken a fuel sample? That truck should have Electronic spark control...is it working correctly? What is the intial timing set at and what is total? Does it have an EGR valve? If so unplug it and see what it does.

Need some more info............on your part

Sounds like timing. Set it by the manual, There's a plug on the firewall that must be disconnected to get the timing right. They will run with the spark off a whole lot, the computer compensates for it, but the maximum advance just isn't there if the dist. is off.

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I think your reading the timing incorrect. I think it should be around 8-10 intial.32 is way too high. When it bogs or hesitates does it backfire or just not take the fuel? Have you checked for an exhaust restriction? Converter plugged? What is your vacuum reading at idle and 2000 rpm? Also what do the plugs look like? and have you look at fuel pressure while under a load not just at idle? How does it run at highway speeds?

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Originally Posted by FFM

fuel pressure is 8 psi, been happening since I put this engine in. It has same specs as old engine though, same TBI, electronics, etc. All vacuum lines are hooked up properly fuel is fine, clean, new fuel filter. spark control working fine. initial was set to 32, and with it plugged in the cpu advances 4 degrees. totaling 36 degrees. has egr, havent tried unplugging it. will try it.

You need stock timing and 11-12 psi for fuel pressure. Then you can start tunning your computer, very easy. Your stock fuel regulator is also adjustable.

Originally Posted by BigTruckDriver

You need stock timing and 11-12 psi for fuel pressure. Then you can start tunning your computer, very easy. Your stock fuel regulator is also adjustable.

Clue me in on how you "Tune your computer" Never heard of that before