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Engine check light flashing

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Old 11-18-2014, 06:11 PM
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Default Engine check light flashing

When I'm going up hill and I keep the rev's at 4000 the light starts flashing. If I drop the rev's it goes away. This is a 2007 JKU auto.

Any ideas what this might be ?
Old 11-18-2014, 07:31 PM
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Flashing light means misfire. Check for codes cycle key on and off 3 times without starting engine it should display codes
Old 11-19-2014, 02:16 AM
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From the 2007 owner's manual ...

When the engine is running, the “Malfunction Indicator
Light” may flash to alert serious conditions that could
lead to immediate loss of power or severe catalytic
converter damage. The vehicle should be serviced as
soon as possible if this occurs.
Old 11-19-2014, 03:18 AM
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Thanks guys
I will get the codes read. Tried the 3 turns on the key but got no code ? Nothing
Old 11-19-2014, 03:46 AM
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Guess you may need to take it and get it scanned for codes
Old 11-20-2014, 03:17 PM
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Had it scanned.
It was a burnt out oxygen sensor which made it run rich and then burn out my plugs.

New sensor, plugs and HT leads.
All good now
Old 11-23-2014, 07:20 PM
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Why were you reving the engine constantly at 4000 rpms?

Sent from my SAMSUNG-SGH-I337 using JK-Forum
Old 11-24-2014, 12:07 AM
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Originally Posted by TommysHaro
Why were you reving the engine constantly at 4000 rpms?

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You've got to be driving a Pentastar to ask that of someone driving a 3.8 auto up a hill. ;-)
Old 11-25-2014, 05:05 PM
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Originally Posted by Mark Doiron

You've got to be driving a Pentastar to ask that of someone driving a 3.8 auto up a hill. ;-)
Truth, but even dragging a trailer through the Appalachian mountains (Virginia \ Tennessee) in my 2012 JKU Sport, I managed 3500 rpms. So pardon my naivete.
Old 11-25-2014, 08:15 PM
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Originally Posted by Mark Doiron
You've got to be driving a Pentastar to ask that of someone driving a 3.8 auto up a hill. ;-)
hahah
I'm with you! 4k rpms pulling a trailer up most any pass in CO is the norm.

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