HI
I am driving on the highway 65 mph , 3000 rpm on 1989 V6 FI F150 . There is a loud explosion from underneath the truck and my engine cuts off . Towed back home I explore the truck and try to diagnostic the problem. The muffler has completely exploded filled with pieces from the catalytic converter The Engine crank but does not start. Fumes exhaust slightly from the remaining exhasut pipe when trying to start the engine, there is no visible blockage and a wire probe runs fine through the pipe When disconnecting the air filter line to the intake there is a strong smell of gasoline mixture. When trying to prime some starter fluid and cranking the engine there is an explosion rejecting the fumes and flame from the air filters lines (burned the air of my hand) I can see the camshaft and a couple valves moving by looking through the OIL Cap opening The engine cranks fine otherwise with no out of the ordinary noises. up to this incident never had backfiring or ignition problems. 500 miles ago I change the EGR valve and control unit clearing an engine light problem. At this point I am thinking in changing the Ignition module to see if it is resolving the problem. Any hints will be appreciated. Alain.