1984 GMC Pickup Backfires - Engine Troubleshooting


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1984 GMC Pickup Backfires

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Gmconyx
New User

Mar 9, 2007, 2:00 PM

Post #1 of 5 (3328 views)

1984 GMC Pickup Backfires	Sign In

1984 GMC Pickup backfires when i left off the gas on the freeway. Even in my driveway the pickup backfire when i rev it up. It backfires so bad that my catalitic converter blew.

steve01832
Veteran
steve01832 profile image

Mar 10, 2007, 5:54 AM

Post #2 of 5 (3322 views)

Re: 1984 GMC Pickup Backfires	Sign In

Start with a compression test across the board. If it is low on all cylinders, check the timing chain to see if it jumped or has excessive slack in it. If your vehicle has an air pump and it is operational, make sure the solenoid is diverting the air in closed loop. If it is sending the air downstream you will have the makings for heavy combustion in the converter. One way to check this is to pinch off the hose at the air pump that goes to the converter and drive the truck. If the backfire stops, you know which system has failed. Good luck and keep us posted on what you find.

Steve

(This post was edited by steve01832 on Mar 10, 2007, 5:58 AM)

black bear
Novice

Mar 10, 2007, 2:50 PM

Post #3 of 5 (3319 views)

Re: 1984 GMC Pickup Backfires	Sign In

if you have a large enough exhaust leak it will back fire

PTEC
User

Mar 19, 2007, 9:03 AM

Post #4 of 5 (3312 views)

Re: 1984 GMC Pickup Backfires	Sign In

explain to me what is a backfire and how can you tell if it is a backfire, then i will see what i can do for you.

Gmconyx
New User

Mar 21, 2007, 10:32 AM

Post #5 of 5 (3311 views)

Re: 1984 GMC Pickup Backfires	Sign In

The truck backfired and blew the catalitic converter and the muffler expanded them. The sound that the truck makes is that of a canon going off. On the freeway, when I let go of the gas you can hear a big boom and feel like a big firecracker just blew under your ass.

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