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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
So what type of ignition engine controll do I have. 318 fuel injected. With the black box behind battery... Truck will mostly run like crap.sometimes very rarely good. But problem is Bogging off line.back fires threw throttle body. Stalls out when slowing down.. Loopy idle will sometimes die. Have replaced coolant temp sensor/ vacum/ fuel lines. Fuel pump / fuel filter/dist cap. Plugs wires. Had it timed at shop. Been to two now couldn't find a problem. Everything seems to be working . Need it fixed its my daily
Sounds like a fuel/air mixture issue. Backfire through your intake/TB can be caused by a few things. Lets start with free stuff, and work towards more in-depth/expensive.
1- Double check your firing order on your plug wires. Very common after a tune up to get a couple crossed, and have it spark on a cylinder that isn't sealed, thus sending fire through the throttle body.
2- Check your timing. Advanced or retarded timing will cause spark at the incorrect time, thus failing to ignite the fuel appropriately.
3- Check your fuel pressure. A rich system can cause backfire through the TB, whereas lean can cause backfire at the tailpipe. Check these:
A- Fuel filter
3- A faulty/misreading O2 sensor can cause a lean/rich run cycle.
4- An intake valve stuck open can cause backfire through the TB. Fuel and air does not get properly sealed into cylinder during ignition, causing combustion in the intake.
Hope this is helpful, and I didn't go too in-depth. Good luck.
__________________ 1978 1 Ton 4X4- Fuel Injected 5.9, NV4500, 3rd Gen Seats.. Great body, but needs painted.