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Old 01-15-2011, 12:22 AM
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HELP PLEASE!! Jeep sputters and pops unless floored

Hi, I have a 98 cherokee with the 4.0L. When the jeep warms up it starts sputtering and popping very bad. However, if you floor the jeep, it runs perfect. I cant find the problem. Ive done just about everything. Anyone know about this problem or have any ideas?

I have replaced all sensors on the jeep: throttle body, O2, transmission, crank and cam.

My new motor only has 27,000 miles on it.
Ive replaced distributor and rotor button.
Replaced battery and starter.
New fuel tank, pump, and filter.
Replaced fuel injectors.
Also went thru all vaccum lines and no leaks.

I have 1 code: transmission controll module that has always been on the jeep since ive had it for the last year.

The jeep has been messing up for 6 months and I havnt been able to drive it. If anyone could help, I would greatly appreciate it.
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Old 01-15-2011, 12:30 AM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

water in the gas
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Old 01-15-2011, 12:52 AM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

#1 check fuel pressure possible a bad fuel punp have had several go bad on me sometimes with weeks of replacement......#2 check idle air contol valve ,if u change this did u clen out the orifice it goes in carb cleaner or such very important step. #3 check for vacum leak hose intake or such//////////clean throttle body also suspect tps clean it or replace first off check for codes in obd2................. put a vacum gauge on it see how many inchs? air charge temp sensor located in intake manifold is suspect also......see rock auto web site fo pixs and discription of parts to better locatlng these........pattyboy
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Old 01-15-2011, 03:15 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

How are the spark plugs and wires? Possible weak coil.
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Old 01-15-2011, 05:43 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

Thanks,
Ive already checked fuel pressure
replaced IAC, MAP, and TPS.
Brand new throttle body
Tested Vaccum lines for pressure
I have new Plugs and wires and new distributer

Thanks for helping, any other ideas?
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Old 01-15-2011, 05:45 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

Oh, also put new headers, removed cat, new flowmasters, and O2 sensors.
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Old 01-15-2011, 05:51 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

perform a compression test on all cylinders possible burnt valve also cylinder leak down test if u have one/////////////////
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Old 01-17-2011, 11:08 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

you say you took the cat off.

1. O2 sensors don't work until they are warmed up
2. O2 sensors have a lesser effect on the engine if floored.

sounds to me like you have some sort of fuel trim issue. sounds like it is running rich, which is giving you no problem when it is floored.
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Old 01-20-2011, 11:17 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

any word man???
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Old 02-15-2011, 07:42 PM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

i bet if you unpluge the o2 cencers it will run great try that and if it dose then they gave you the wrong o2 for it
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Old 02-24-2011, 09:24 AM
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Re: HELP PLEASE!! Jeep sputters and pops unless floored

Check the vacuum line going to the master cylinder. I had troubles with mine every time I went through the car wash. It took me a year to finally figure out what was going on. I put a hose clamp on the hose and have not had a problem since.
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