backfire 1977 wagoneer 360

[snook]

the jeep backfires sometimes when i let off the gas after accelerating or sometimes when i let off the gas after just cruising down the road. any ideas? 1977 with a 360 amc momo. this thing has only 42,000 miles (real mileage, you should see this thing) and has been sitting for years before i got it. i'm thinking that maybe the intake valves are sticky and might free up after i drive it for awhile. any ideas?

[J20 project]

Whoa, a man after my own heart. I ran a Jeep and a MOPAR for years myself. Unfortunately only have the Jeep now but I still have a 383Mag tucked away for the right vehicle, like maybe a 73-74RR. At any rate, check your exhaust system real well, it kind of sounds like you might have a hole somewhere. While accelerating you are dumping a lot of unburned fuel into the system and then it ignites when you let off as it sucks in more O2 to allow the explosion. J20

[Sgt. Dave]

If the AIR diverter valve is bad, or there's a leak in the system, it will cause it to backfire in the exhaust. Disconnect the air line to the exhaust manifold, and cap it. Should cure the backfire.

[snook]

thanks for the responses guys, i'll check it out.

[ February 06, 2002: Message edited by: snook ]</p>