Mechanics

5TH AVE IDLES OK BUT POPS BACKFIRES THROUGH CARBERATOR

1986 Chrysler 5th Avenue

I have a 1986 Chrysler 5th avenue with 74000 miles 318 engine I filled up and went 6 miles it started to pop backfire. I changed the gas plugs wires battery. It back fires through the carberator but only when you step on the accelerator it idles ok and starts right off
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Mpzbest
June 16, 2007.




Timing issue. The plugs are firing when the intake is open, thus creting a backfire throughout the intake.

Check all your vacuum lines, in particular the one that goes to the distributor. Regardless of anything else, replacing them is a necessity on older cars.

Next, you probably have that Lean Burn computer, wouldn't be surprised if that's got down the drain.

Get on over to http://www.allpar.com and get into the FMJ-body message forums. There are guys there who can explain issues with that better than I.

Tiny
DragonDon
Oct 15, 2007.


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