99XJ idles fine, but sputters when throttling

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12-31-2015, 12:35 PM

#16

iluvmud

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Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by t.mcginley.jr

If smoke was pouring out from the intake/exhaust area then you definitely have a leak either at the gasket or a cracked exhaust manifold. How many miles are on the motor? See if you can pinpoint where the smoke comes out, like from where the manifolds meet the head or down further on the exhaust somewhere. I'm thinking it's the intake/exhaust gasket gone bad, or loose bolts, or both. Therefore causing a big misfire condition.

what im thinking too, oddly enough the sputtering has been greatly reduced and its only happening occasionally when driving now (3 sputters in the last hour) I will wait for it to cool, replace the O2 sensors, and the coil and plugs since these are already purchased. Anyone recommend a good intake/header gasket? I'll be taking it all off just to give it a good once over either way.

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12-31-2015, 12:38 PM

#17

t.mcginley.jr

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Year: 2000

Model: Cherokee

Engine: 4.0L

I would go with either OEM Mopar or the Fel-Pro one (I used this one mine with good results). Make sure to torque the bolts right, I forgot the ft-lbs offhand though.

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12-31-2015, 12:41 PM

#18

iluvmud

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Year: 1999

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Engine: 4.0

I might have the torque specs that came with my replacement exhaust manifold(replaced 2 yrs ago). I'll update the thread with my findings.

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01-02-2016, 11:02 PM

#19

iluvmud

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Year: 1999

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Engine: 4.0

well great news........ head's not cracked!! I still have the leak(havent changed the gasket yet) BUT I was able to find the problem.......... spark plug

not even a fouled one.... when i pulled it out it there was 0 gap like it got pressed in when i put in the plugs, really odd but hey I'm no complaining I'm glad its running like a top now and gave it a new accel coil and new Taylor wires (in the mail) along with the new plugs.