1996 4.0 running poorly again.
06-23-2016, 07:40 AM
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Year: 1996
Model: Cherokee
Engine: 4.0
1996 4.0 running poorly again.
P1391 again but if I unplug the front o2 sensor she run great. replaced the front o2 sensor and ran great for 3 days then p1391 again. Unplug o2 sensor and she runs great again. Re-plug o2 sensor and she is running fine again. Any ideas ????? new dist, new cps sensor, new cam PS , New Bosch o2 sensor. fuel pressure 49 lbs.
Last edited by Photontraveler; 06-23-2016 at 07:59 AM.
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