dumping raw fuel in the in to the exhaust

[86jeep]

Ok i change the 02 i put new plugs and clean the throttle body. It help for a few days. Now it back to poping in the exhaust again when u cut the truck off

[JeepcoMJ]

plugs, wires, cap, rotor would be a start. surely plugs, if it's putting unburnt fuel into the exhaust.

 

aside from that, check for an intake manifold gasket leak.

 

I assume it's a 4.0? a bad intake/exhaust gasket leak would allow fuel to get out and right down in the exhaust. doubtful, but it's an idea.

 

aside from that, any fuel injectors wet when you shut it off or while running? if so, cracked injector.

[Pete M]

a similar issue on my 86 was caused by corrosion on the + terminal of the coil which apparently caused a weak spark. the gas eventually blew my muffler apart. :doh:

[86jeep]

2.5 i put new BWD Ignition Coil , new Xact Spark Plug Wire Set, new Autolite Single Platinum Spark Plug's , new BWD Distributor Cap , and BWD Distributor Rotor, all about 4 months ago. Last week i put new Champion Spark Plug's, Denso Oxygen Sensor Direct Fit, and clean the throttle body. it still doing it

[86jeep]

any help

[Pete M]

have you taken things apart and watched the fuel injector in action to check for flow and drips?