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Check for a shorting spark plug wire when the engine is under load. Get a spray bottle of water, and mist some water on the plug wires from the dist. cap to the spark plugs. Rev the engine, and you might see a blue spark shorting to the outside of the spark plug or to the cylinder head. If that checks out, check under the dist. cap for any oxidation on the contacts, or hairline cracks in the cap. Any of these things will give you a misfire under load.
REMOVE DIST. CAP AND CRANK ENGINE SEE IF ROTOR TURN IF IT NOT, CHECK TIMING BELT, IF IT TURNS CHECK FOR SPARK ON DIST. CAP WHERE COIL WIRE GOES IF SPARK CHANGE OUT SPARK PLUG WIRES.IF NO SPARK CHECK IGNITION COIL AND PICK UP COIL.
Coil may be producing low voltage (KVs) to where it makes enough energy to snap out of the coil tower but then supressed as it travels down the high tension leads finally to the plug. Incidentally spark plug leads should have about 10k ohms of resistance per foot.I good coil will jump spark at least a half inch if you pull the wire off the cap and produce this much air gap
There may be no injector pulse if the computor does not see a RPM signal. There will be no spark if the ignition module does not see a dist pulse from the dist pickup.......a RPM signal. Because you do not have both ......I would suggest to check/change the dist pick up. Follow the wires from the ignition module inside the dist to the pickup which is also inside the dist. If it is just a bad dist pickup....keep all your old parts as good spares. Also...is the dist turning? to provide a RPM signal? You will have to remove the dist to change the pick-up.....mark your timing locations......"rotor position" and "dist body location"before removal. A quick test before installing the "repaired dist" .....plug it in the the truck wiring and turn on the key....DO NOT CRANK THE ENGINE OR YOU WILL LOSE YOUR DIST ROTOR CORRECT POSITION......as you spin the dist by hand .....the injectors should spray.
Well it could be many things, But have you relpaced the dist. cap and rotor, within the last 15,000 miles or wires and plugs??? next step is the coil ? then it gets fun. like timing. but I think most jeeps with a Inline 6 have a bullet proof engine for the most part. As we all know there is plenty of semi's on the road. well the same set up is there. as an Inline Jeep. I would have to say 90% of semi's on the road are inline 6 cyl. engines. and may of them go to 1million miles.
so plugs,wires, cap, rotor and ignition coil. that is a good starting point.
Ignition coil or distributor cap. Not knowing the Avenger I couldn't tell you where to find either but follow the HT leads from your plugs and you should find them. If you aren't getting a spark on any plug then the perp is your ignition coil and it'll need replacing, if you're getting a spark on some then it's the dist cap, check the contacts and give them a clean and see what happens. F.Y.I. the dist cap is the first thing back up the line from your plugs with all the HT leads going in, and the ignition coil is after the dist cap.
A spark plug "ignites" the fuel air mixture inside the engine. Follow the thick wires from your distributor cap to your engine to find your spark plugs.
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