Timing issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chris989 · 01-06-2012, 10:04 PM

Hello all.

I have been fighting with my 89 burb 5.7 and i have it narrowed down to timing. The truck is slow and sluggish. the more gas i give the worse it is.

I set the timing at zero unplugged, plugged it it advanced to 8-10. revved it advances more (good) but it has a slight drop before it advances. SO,,,
I put the truck in gear, brake set, and put a load on the motor and it retards. it will go all the way to 10+ ATDC. It is acting like an old dist. hooked to the wrong vacuum.

The more gas i give it the more it retards, so driving in the mountains is impossible. As long as i keep my foot out of the gas i can creep along.

It does run smooth as silk as long as i do not try start too fast i can get up to speed but i have to accelerate slow off the start.

Any help would be great.

01-06-2012, 10:04 PM	#1
chris989 Registered User Join Date: Dec 2011 Location: Boise, Idaho Posts: 555	Timing issue Hello all. I have been fighting with my 89 burb 5.7 and i have it narrowed down to timing. The truck is slow and sluggish. the more gas i give the worse it is. I set the timing at zero unplugged, plugged it it advanced to 8-10. revved it advances more (good) but it has a slight drop before it advances. SO,,, I put the truck in gear, brake set, and put a load on the motor and it retards. it will go all the way to 10+ ATDC. It is acting like an old dist. hooked to the wrong vacuum. The more gas i give it the more it retards, so driving in the mountains is impossible. As long as i keep my foot out of the gas i can creep along. It does run smooth as silk as long as i do not try start too fast i can get up to speed but i have to accelerate slow off the start. Any help would be great.



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