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Old Mar 24, 2018 | 03:11 AM
  #1  
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From: Ar
Strange

Check engine light doesn't come on till truck is moved less than fifteen ft, will idle for hours with no light, only code stored is 111
 
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Old Mar 24, 2018 | 06:23 AM
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what year, engine, model??
 
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Old Mar 24, 2018 | 09:56 AM
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It"s the 1995 F150 302, 4r70w. been chasing this gremlin for a week now.
 
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Old Mar 24, 2018 | 10:49 AM
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If there is a CEL triggered there will be code stored in CM. FYI....there are two parts to checking codes with the engine off. The first part are the Key On Engine Off tests, the second is stored code (aka Continuous Memory) display. You stated " only code stored is 111 " so is that the result of the KOEO tests or is that really from CM? If the latter, what were the result of the KOEO tests?

The only ways to have a CEL lit and no stored codes are a lack of KAM power or the computer is bad.
 
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Old Mar 24, 2018 | 11:15 AM
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Well that isn't good good news, Thank's everyone .
 
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Old Mar 24, 2018 | 07:41 PM
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New rebuilt computer had no effect, still recieve system pass, at a loss here. Could my code reader be bad?
 
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Old Mar 24, 2018 | 07:43 PM
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Truck runs like a champ, just not used to seeing the the check engine light after 23 years.
 
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Old Mar 24, 2018 | 08:59 PM
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Originally Posted by Robert Long
New rebuilt computer had no effect, still recieve system pass, at a loss here. Could my code reader be bad?
System Pass for both KOEO and CM?
 
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Old Mar 25, 2018 | 12:27 AM
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Vehicle speed sensor? Don't know if/how that would code but it's all I can think of that the truck wouldn't know about until it was moving.
 
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Old Mar 25, 2018 | 06:04 AM
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Not sure ether, must be a short, but still should throw a code I would think.
 
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Old Mar 25, 2018 | 09:52 AM
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Posts #4 and #8....
 
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Old Mar 25, 2018 | 10:32 AM
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4&8 yes only codes are 111 and 10 on ether computer. Could the code reader be bad ? A friend is bringing his over this afternoon, guess I'll know then,
 
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Old Mar 25, 2018 | 12:03 PM
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something is not rite. if the check engine light is coming on, there is a code.
 
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Old Mar 25, 2018 | 12:26 PM
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That's what I keep thinking, but it runs great Everything seems to be working. Am I right to think All the engine light monitors is the emission controls?
 
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Old Mar 25, 2018 | 01:09 PM
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1995 CEL could be for almost anything from a loose/bad gas cap, to a problem with the transmission
if it is computer controlled, it will throw a CEL if there is a problem.
.it can have a CEL and seem to run fine, it may be a non essential item that is causing the problem code.
 
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