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Jeep loses all power while driving but will regain it if i put it in neutral and pump the gas pedal but have to keep motor accelerated in order for it to stay on
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That doesn't mean it's losing compression. It can only possibly lose compression from internal wear or sticky valves or stretched timing chain or catastrophic failure - it can't lose compression one moment, then regain compression the next moment except in cases of sticky valves or stretched timing chain.
I doubt you have any of these issues, unless your car is pretty badly worn. What's happening is your car has lost most of its POWER, not compression.
At any rate... if it's a modern car, get the computer's error codes with an OBD (if pre-1987) or OBDII (1997 and later) scan tool. If no codes or engine older than about 1987, suspect poor or old gasoline, fuel pressure or flow rate, clogged air filter, weak coil, plugged exhaust, various ignition-related issues, park brake set, accelerator linkage, serious mechanical problems (wheel bearings, etc). This isn't a question that warrants a quick "silver bullet" answer, there are TONS of things that might cause you to lose the ability to accelerate.
Sounds like a faulty boost pressure sensor or waste gate. I would check the waste gate first. Sounds like it is opening to soon and letting the boost out, than regaining again.
Your noise sounds like it is power train related,If you have eliminated the engine,Since it doesn't make the noise while moving and in neutral. It sounds like a universal joint in the drive shaft.Do you notice a vibration along with the noise?
The accelerator is the gas pedal...how are you cranking the gas pedal in park? and, if it only stays running when you are doing this how are you "ready to go"? Was the battery tested? if the engine turns over (cranks) when you turn the key, likely there is nothing wrong with it. If you can drive it after doing whatever you do to get it running, it's doubtful that the ignition switch is bad. If it runs well after you get it started, it has nothing to do with spark plugs. Fuel pump may be draining back and loosing pressure but you need to have pressure tests done to verify that. If you cannot crank the engine in neutral, I'd check the neutral safety switch....it should start in either park or neutral. The pump and switch are about $200 apiece...good idea to test them before spending money not to fix the problem!!! Hope I got this right...your post is a bit confusing.
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