When i set the timing on my 92 gmc 350 it sputters and backfires. Knew timing chain and cam.

Mike Vincent

• 358 Answers
• Posted on Jun 12, 2009

SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive

ou need to check compression on all the cly. do you know which cly is dead?

Marvin

• 85242 Answers
• Posted on Aug 05, 2009

SOURCE: Misfires 96 gmc sierra 5.0

I suggest you have the injectors tested by the dealer, the sludge buildup will not cause a miss fire. to clean the throttle body use carberator spray while holding the engine idle high.

SOURCE: my 92 GMC Sierra starts and runs great for 5 to 10

Hello, I recommend changing the fuel filter. Old trucks are known to do this and I found that changing the fuel filter helps alot. After the filter change add some fuel injector cleaner and put some gas in it and see if this helps. It would not hurt to change your air filter and change your oil. Always do the cheapest things first especially in this economy. If this does not help let me know. This could also be your fuel cut off solenoid. In most vehicles these get hot and the truck just shuts off and you think it may be a loose battery wire or bad spark plug gap; sometimes it's just this solenoid. You could replace it but you can only get them at a dealership and there not cheap. You could also bypass it but I do not recommend that becuase in a case of an accident the fuel will not be shut off. I hope this fixes your problem.

SOURCE: 92 gmc 350 pickup....rough idle..have replaced MAP

This could be a couple of things:

1. Check that you have not got any vacum leaks between inlet manifold and cylinder head.
2. Check your spark plugs and HT leads are in good condition and not worn, reset gaps. If worn replace them.

SOURCE: I need to set the timing on my 1997 GMC Vortec 350

4 DEGREES BEFORE TOP DEAD CENTER UNLESS SPESSIFIED ON TAG UNDER HOOD