C10 305 won’t idle.

[Quan Nguyen]

305 won’t idle and won’t stay on unless given throttle, could it be the timing ? Because the engine sounds very funny, I already also tightened down the idle screw on the carb and carb recently just had a rebuild. Please help !!!!!!!


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[1987 GMC Jimmy]

It could be the timing. You’d need to check. Does it have the factory ESC distributor, or is it using one with a vacuum advance? If the base timing is less than 0* BTDC with your advance unplugged, that’s not doing you any favors. 5* BTDC would be a better spot to try. Otherwise, I’m suspecting the carb. Has it ran right since the carb was rebuilt? What carb?

 

[Rusty Nail]

Did you talk real sweet to it and ask nicely?

I'd try that first!

Maybe go to AutoZone and ask them to scan the computer?
I think they do it for FREE.

 

[Doc_Ellis]

Large vacuum leak?