Tech Support Forum - View Single Post - 1991 chevy s10 blazer 4.3 engine backfires in intake manifold

Whitetail Crazy · 05-30-2008, 11:35 AM

If it idles OK then the EGR is probably not sticking open. I hate to have you just changing parts but it sounds like it could be the ignition module or possibly the pick up coil in the base of the distributor.
Also, if this is the diaphram type EGR, reach under and push the diaghram up while idling, that will make it run rough or possibly even die. If no change then you may be looking at an EGR problem but it really doesn't sound like it.

05-30-2008, 11:35 AM	#6 (permalink)
Whitetail Crazy Registered User Join Date: Apr 2008 Location: Illinois Posts: 29 OS: windows xp	Re: 1991 chevy s10 blazer 4.3 engine backfires in intake manifold If it idles OK then the EGR is probably not sticking open. I hate to have you just changing parts but it sounds like it could be the ignition module or possibly the pick up coil in the base of the distributor. Also, if this is the diaphram type EGR, reach under and push the diaghram up while idling, that will make it run rough or possibly even die. If no change then you may be looking at an EGR problem but it really doesn't sound like it.