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Why is my Check Engine light on?

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Old 08-18-2011, 03:51 PM   #11
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Thanks Bucko
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Old 08-18-2011, 09:03 PM   #12
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I'm no mechanic but if your engine were running closed loop all the time it IMHO is probably the OBC module and you should notice it.

I posted a similar question about my 04 Lariat 60k 5.4 3V light was on. Gages hesitated to register and bounced a bit at start up. The digital trip, gas mileage, etc.. info would reset. I was thinking gremlin....

It was recommended I check the battery. Sure enough, original battery from MotorCraft. Replaced it a few days ago with Interstate Megatron and all has been perfect! Worls of differnece.
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Old 08-19-2011, 12:10 PM   #13
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Well.... I appear to have no engine running problems. I crank it up and it has the high idle for a few seconds like it normally should and then idles properly. Then it runs normal... no misfires, no weird noises... just normal. I really don't know where to look until I get a code check done. Be gettin that done this weekend.
Thanks for the input.
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