Help my 1987!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChevyTech · 02-02-2008, 12:10 AM

Backfiring is not a common problem on TBI trucks.

If you ruled out the ignition system, you should look for a mechanical cause for the problem.

An intake valve that is not sealing or a flat cam lobe can cause backfiring.

If the problem is an intake valve not sealing it should show up on a compression test.

To check for a flat cam lobe you could remove the rocker covers and see if one of the rockers is not moving like the rest of them.

02-02-2008, 12:10 AM	#26
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: Help my 1987!! Backfiring is not a common problem on TBI trucks. If you ruled out the ignition system, you should look for a mechanical cause for the problem. An intake valve that is not sealing or a flat cam lobe can cause backfiring. If the problem is an intake valve not sealing it should show up on a compression test. To check for a flat cam lobe you could remove the rocker covers and see if one of the rockers is not moving like the rest of them.



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