I feel like i have a 60hp engine but i have 4.0???? really need help!!!

[YuriSouder]

My jeep lost all its power one day and I cant get it back. I cannot go over 45 mph. I have no idea why but my jeep has an exhaust rattle some suspension bs a messed up master cylinder(just found out today) but other then that fine. The only off roading I have done has been just cruising in 14 inches of water. My jeep feels like it is running off of a lawnmower engine. Give me some suggestions I am ****ed if i can figure this out in the next 2 days.

-Would I be engine compression???
-When I step on the gas the rpms dont go up so its not the clutch. its making a very loud noise like my exhaust is messed up. i can hear my exhaust rattle when i slow down.
-When I am driving it feels like a can pass this point because someone is -------holding the brakes just enough but when I but it in N is just cruise like normal.
-I can feel it nudge when I am driving as in like slow down then pickup a tiny bit then slow down. I cant make it up a hill going over 10.

[Jeeper99]

not sure about the rattling in the muffler (Could it be rattling in the engine?), but if you've been runnin around in water, pull your spark plugs and check them. You may have fouled some out and she's not firing on all 6. (Could you have got water in the air intake?) Sounds like the engine is missing causing it to hesitate.

Did it start acting like this after you went through the water?

[Ken72]

I know 14 inches isn't all that deep but how fast were you going? Check your plugs like Jeeper99 mentioned. You may want to change you fluids too some water may have seeped in where you don't want it. It could also be the tps is fouled now too.

	Throttle position sensor A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).

[Itchee96]

You could have a really bad exhaust leak. That will definitely kill the power to your engine.

[jbdayojeep]

You might have a catalytic convertor going bad. When mine started going (before I finally took it off) it would cause my "95 4-banger to lose power. And it rattled when it went bad.

[Wrangl3r93]

From my understanding the headers on the 4.0's are prone to cracking. Maybe if water splashed up into your engine bay? If the exhaust gases aren't making it to the o2 sensor, whether from a crack or being loose, the engine will run horrible.

[TerryMason]

I think you'll just have to roll around under your jeep, looking for exhaust leaks.

If you put a rag over your exhaust pipe can you kill the running engine (exhaust nice and tight), or does it just run fine?

[YuriSouder]

I figured it out the lucky winner is drum roll please......jbdayojeep. my cat was plugged up. I hollowed it out and didn't put the muffler on for a few hours, WOW that is amazing! Tomorrow morning I will put the muffler on and take it over 30 miles an hour to try and comfier everything but it feels allot better.

I hope i didn't speak to soon. but it really seemed like my power was back(at least alot more, like i said i did not want to be driving in public with no cat or muffler(police suck in MN).

[jeepmaster]

Nitrous my man, if that doesn't work then it probably is your cat. Imagine how fast you could run if you were plugged up somewhere.....