1994 4.0 jeep wrangler 100,000 miles had new catalytic converter put in and all fuel injectors changed. While driving it starts to stutter and backfires, I press on the gas pedal and has no power. I put it in gear and does not move. the engine light does not come on. what could be the problem? when in idle mode it seems fine, once i put it in gear and start driving it that's when it happens
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Re: backfiring and loss of power
'till you do some in depth testing of all systems, I'd place equal weight on every possibility. Make sure you cover the basics like fuel filter etc before getting crazy with it though. Also check cap. rotor, coil and wires. Idle cylinder pressure is different than that encountered when driving. This additional pressure will cause ignition spark to seek a better easier ground,(not the spark plugs where it should be going) causing missing under load.After checking , if you haven't found anything, its time to begin testing fuel pump pressures, modules and controls. good luck
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1994 Wrangler with 200,000 miles on the odometer. Similar problem here: Severe bucking and backfiring, and engine misses when traveling down the road. I did an entire tune-up (plugs, wires, distributor, distributor cap, and ignition coil), but got the same thing. I thought it was dirty fuel injectors, so, I poured a bottle in a few times on fill-ups. The final solution, was a bad alternator. My mechanic said it was sending voltage spikes to the computer, causing the engine bucking and back-firing problems.
Have you had fuel pressure tested, and/or filter changed. Have you checked for plugged exhaust, such as catalytic converter? Quite often engine will also run a little hotter than normal when exhaust is plugged.
loss of power can happen even if exhaust does not flow in other words you have a rstriction in the exhaust usualy the catalytic converter has collapsed any exhaust shop will be able to tell you right away, or when you loose power do you hear a hissing noise ? if so that is clearly a clogged converter replace the catalytic converter
It sounds like the catalytic converter. I had the same problem. What to check....after driving for a couple of miles pull over and look underneath at the converter, if it is glowing there is your trouble.