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1989 4.0 cherokee surging, blowing back into intake

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Old 10-04-2009, 01:45 PM
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Year: 1989
Model: Cherokee
Engine: 4.0
Default 1989 4.0 cherokee surging, blowing back into intake

Last wendsday on my way home from work it started suggin like a automatic transmission shudder. So i just slowed down a lil and came on home. while exiting the highway i realized it was a loss of power and not a transmission shudder. So I figured it had a miss and replaced the plug wires and checked the plugs al the plugs are ngk and less than 10k n them so they looked all ok. So i started checking things, did a compression check and they were all within 10psi of each other. Replaced the distributer, cap and rotor, and it has a brand new crank sensor in it also. I checked the fuel filter also and it with the key on the pump pushes plenty of fuel through it. So that's were im at on it and if anybody has any good idea's please inform


thanks alot guys

ray
Old 10-04-2009, 02:09 PM
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How old is your exhaust system?could be a plugged cat.
Old 10-04-2009, 03:53 PM
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ray, check out my "surging" thread
Old 10-04-2009, 07:20 PM
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how many miles does it have???? take a look at your timing chain.. if its stretched that will cause your symptom
Old 10-05-2009, 05:56 PM
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tps????
Old 10-05-2009, 10:14 PM
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Check your fuel pressure with a GAUGE...
Old 10-05-2009, 10:29 PM
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Originally Posted by zjrog
Check your fuel pressure with a GAUGE...
x2

and check the cat have some one reve the motor you should feel the pressure change if you feel little or no change

remove cat and inspect
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