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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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Old 10-10-2013, 04:02 PM   #1
Maverick710

 
Join Date: Aug 2013
Vehicle: 2000 Ford Mustang
Location: Texas
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Default Check engine light doesn't come on ?

hey guys my mustangs service engine doesn't come on and i know it has to come on because my cars having misfire issues. When i turn the cluster on without starting the car the light is on so the bulb is good so does anybody know if there's a fuse or relay that controls it?
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Old 10-10-2013, 05:16 PM   #2
Derf00
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Rather than rely on the light, hook up a handheld OBDII scanner that has a datalogger or live view. It will be obvious which cylinder is having the misfire then or what is causing it.
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Old 10-15-2013, 08:08 AM   #3
petrock
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Originally Posted by Derf00 View Post
Rather than rely on the light, hook up a handheld OBDII scanner that has a datalogger or live view. It will be obvious which cylinder is having the misfire then or what is causing it.
+1. Not all misfires will cause the check engine light to com on.
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Old 10-15-2013, 08:08 AM
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