When I retard the timing it will run and almost idle but when i put the timing at 6BTC it wont rev or stay running
any ideas?

 

Are you using an adjustable timing light? If so, is it set to 0?

 

No timing light is not adjustable

 

Did you disconnect the tan wire?

 

there is a tan wire with a black trace/line that must be dis-connected to set timing . called EST , electronic spark timing . it's located near the heater box , mine is between htr. box & A/C plumbing . there is 2 1/2" connector , dis-connect , set timing (mine is set at 0) , re-connect . should be good to go , good luck .

 

[quote=UNCLE TOM;4734861]there is a tan wire with a black trace/line that must be dis-connected to set timing . called EST , electronic spark timing . it's located near the heater box , mine is between htr. box & A/C plumbing . there is 2 1/2" connector , dis-connect , set timing (mine is set at 0) , re-connect . should be good to go , good luck .[/quote

I had EST wire disconnected
mine times at 6BTC
its a 1987 5.7 Iroc Z
ive checked for vacuum leaks replaced the coil MAF cap rotor wires (yes ive checked firing order a dozen times) TPS is set at .55

 

OK im back to 6 BTC base running like crap and wont idle or stay running.

anybody have a hand grenade?

 

Wondering if your balancer may have spun and is not giving a true reading.

 

Do you have a stock timing tab, or a adjustable tab? Awhile back my adjustable timing tab moved caused I didn't tighten it down well. Which made me think my timing was some where else. I had to use a piston stop and find TDC for number one. I then re-adjusted my tab to the correct position, and all was well afterwards.

 

Lemme guess:

Stock balancer, replacement timing cover with bolt-on aftermarket timing tab; probably "chrome" :barf: ?

That combination puts the timing mark roughly 35° retarded from where it's supposed to be. Meaning, when you follow the "procedure" and "set" your timing, it will be approximately 29° ATDC (retarded), instead of 6° BTDC (advanced).

Best thing to do would be to locate #1 TDC by some ACCURATE means, totally independent of the timing mark, such as with a piston stop; make a new mark on your crank damper that lines up with 0° on whatever tab you have; and then you can use a light.

Or, you can just set it to where the car runs the best, and not bother with a light at all. Since after all, the engine doesn't whup out a light and look at the mark and decide how it's going to run; it merely responds to how the thing is put together. It doesn't need to see the mark to know what to do, you don't really either.

 

Stock cover new stock balancer when rebuilt about a year ago

 

Verify TDC. There is more than one balancer and timing tab location depending on the application. You may have a mismatch, or your new balancer may have become old real quick.

 

Find TDC with a piston stop and verify your timing marks.