Foul Smell, Hesitation & Check Engine Light
07-09-2011, 07:55 AM
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
Foul Smell, Hesitation & Check Engine Light
OK Guys,
Had to change a freeze plug, which meant removal of intake/exhaust. All went smooth and the project didn't take very long at all. However, now my check engine light is on, the foul gas smell is horrible, and I have a hesitation when trying to accelerate quickly. No intake leak. Running down vacuum. I have no OBD1 tool to check. 95 4.0HO. Foul order is probably 02, right? Could that also cause hesitation? Runs smooth at idle and after initial hesitation....
What say you?
Had to change a freeze plug, which meant removal of intake/exhaust. All went smooth and the project didn't take very long at all. However, now my check engine light is on, the foul gas smell is horrible, and I have a hesitation when trying to accelerate quickly. No intake leak. Running down vacuum. I have no OBD1 tool to check. 95 4.0HO. Foul order is probably 02, right? Could that also cause hesitation? Runs smooth at idle and after initial hesitation....
What say you?
07-09-2011, 10:26 AM
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Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
Could try CLEANING the O2 sensors... Recheck torque on manifold bolts. Check all fuel lines/connectors for cracks and leaks
07-09-2011, 09:34 PM
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
Checked for leaks, cleaned the o2 sensor, replaced vacuum connectors that appeared to be bad and still have check engine light, hesitation and some backfire. I am beginning to think it could be timing?
What say you?
What say you?
07-10-2011, 12:14 AM
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Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
Tuning is all computer controlled at the distributor. Maybe a cam position sensor? right underneath the distributor. Try replacing O2 sensor first. I'll look up how to check the o2 tomorrow in my fsm. It has to have a certain voltage reading or it's shot
07-10-2011, 01:24 AM
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Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Lunghd.com on site tech... http://www.lunghd.com/Tech_Articles/...iagnostics.htm that's for renix but I think the resistance on the oxygen sensor is the same.
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07-16-2011, 10:23 PM
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Year: 1995
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Gentlemen,
I finally got around to looking further into this one and replaced the o2 sensor, cleaned the throttle body (full of black gunk) and she runs like a champ! Drove around the neighborhood with several hills and no hesitation at all, no foul smell and she flat moves. Thanks for the post and suggestions. I appreciate the help.
Next is to replace the spark plugs. They were gapped well over 35 thou and are not in the best of shape.
I finally got around to looking further into this one and replaced the o2 sensor, cleaned the throttle body (full of black gunk) and she runs like a champ! Drove around the neighborhood with several hills and no hesitation at all, no foul smell and she flat moves. Thanks for the post and suggestions. I appreciate the help.
Next is to replace the spark plugs. They were gapped well over 35 thou and are not in the best of shape.
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