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'91 jeep cherokee 4.0 hesitating help need


 
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eric julius
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Joined: 27 Feb 2007

PostPosted: Tue Feb 27, 2007 11:49 am    Post subject: '91 jeep cherokee 4.0 hesitating help need Reply with quote

looking for help from jeep guys, my '91 cherokee 4.0 sometimes hesitates at low rpms, i changed the fuel filter and cleaned the injectors and changed the MAP sensor and O2 sensor, car has over 200k miles. I also replaced a bad catalytic, i think the combustion temp may be a little high. It doesn't have EGR (must not be a CA car). I'm wondering if the head gasket is leaking, i am going to torque the head bolts down this weekend. Compression test shows good compression same on all 6 cylinders. Any help appreciated.
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dancerman
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Joined: 08 Jun 2006
Location: Atlanta

PostPosted: Wed Feb 28, 2007 2:47 am    Post subject: Reply with quote

You say "sometimes hesitates" so it's probably not head gasket leak. Check the throttle position sensor.
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94BGCherokee
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Joined: 22 Jun 2006
Location: Saint Louis, MO

PostPosted: Wed Mar 07, 2007 11:34 am    Post subject: Reply with quote

Hi Eric I got your post, I have 170k on mine and have the same issue, is just annoying. I run premium in her all the time and it seems to help, but its weird, i thought maybe ahead gasket leak as well, but doubt it, i have bored TB and spacer borla exhaust with no cat, so idk any ideas are appreciated. New plugs wires everything let me know what else could be. Does this in all temperatures for me.
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