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Unread 12-10-2011, 11:11 AM   #1
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1998 ZJ 
Join Date: Aug 2010
Location: West Virginia, WestVirginia
Posts: 161
Timing 4.0

Ok so I recently had my 1998 jeep grand cherokee 4.0 rebuilt. Now it is running but once you drive it for a lil while the check engine light comes on and gives an upstream o2 sensor code. But when hooked to a scan tool both o2 sensors are going crazy. We checked the timing at the distibutor and it shows to be about a tooth out but if you put it were it is suspoded to be it wont run. The scan tool says it is firing at 14-17 degrees before top dead center at idle. Can anyone tell me what it is suspoded to fire at.

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