7.3 check engine light - Ford Powerstroke Diesel Forum
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Old 04-04-2012, 12:51 PM
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7.3 check engine light

I have an early 99 7.3 with 120,000. I have had no problems with it so far. I was towing a trailer with a mower on it down the highway and after about 70 miles the service engine soon light came on for about five seconds, until I hit the brake to shut down the cruse and then the light shut off. I continued to drive another 85 miles and the light never came back on. When this happened it was during a very hard down pour, it was raining so hard you could barley see. What could be the cause for the light to come on for such a short period and then everything seems to be fine? Could it have been from a wet connection?
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  #2  
Old 07-29-2014, 11:26 AM
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Check Engine light, loss of pwer

Did you ever get any responses.. that just happened to me.
But the light stayed on longer... I chugged the F250 to the KOA
campground and just before I shut it down the light went out and
the engine started running smoothly again. I did a little research
and found that maybe a wiring harness into the valve cover
had become intermittent inside...

Im stuck now at a KOA Campground.. have to take it into
a local Ford store to diagnose the issue.

Ideas?

Dennis/WB6UHQ Los Banos CA
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Old 08-01-2014, 06:48 PM
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Torrential rain can get into electrical connections and cause all kinds of problems. If you take it to Ford running fine , then they won't be able to diagnose the problem or recreate it . You will leave there about $700 lighter and no answers.
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