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Blinking check engine light

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Old Sep 3, 2005 | 10:20 PM
  #1  
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Cool1996
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From: Livonia
Blinking check engine light

I have a 1999 F-250 with a 7.3 and an auto trans

I was on the e-way merging on, and there was a semi coming so i put it to the floor and i glanced at my speedometer and the check engine light flashed once. It will flash periodically when it is under heavy accelleration on the expressway (like from 55mph to 70mph) and it is worring me....any suggestions are great..i am slowly learning about diesels so bear with me
 
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Old Sep 3, 2005 | 10:53 PM
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From: Morgantown WV
Check the codes and post them. We will be of more help with them.
 
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Old Sep 4, 2005 | 12:08 PM
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Cool1996
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I checked for codes this morning with my code scanner.......and there is nothing

the check engine light only blinks once in a while under heavy accelleration
 
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Old Sep 4, 2005 | 02:56 PM
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It could be back pressure. What power adders do you have? What kind of scanner did you use? Some will not give vehicle specific codes.
 
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Old Sep 4, 2005 | 05:39 PM
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From: Livonia
It has a 3.5" straight pipe with a 5" tip on it
I used an actron code scanner that is for OBD-II vehicles that i got from advance auto parts
and it has a 85hp chip that you plug in under the drivers side dash in a metal box...it doesnt have a brand name on it but it is blue


hope this helps...and i feel like an idiot because of my ignorance to diesel engines
 
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Old Sep 4, 2005 | 08:52 PM
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Some scanners will only read OBDII generic codes. You need to find someone with a better scanner and check vehicle specific codes.
 
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Old Sep 6, 2005 | 12:03 AM
  #7  
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usmc5953
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From: Fredericksburg, Va
boost pressure

Well here is my 2 cents, I had a chip in my truck and when i put my foot into it when i had a load the check engine light would come on like a flicker. I believe that I have read that the chip will and may allow the turbo to bulid more pressure than the MAP is able to read, or over boost, I think that any thing over 16psi will cause a check engine light. If this is the fact then I would not worry about it too much, I think there is a mod where you can try and bypass the senser and see it that is the problem. I am not a pro, and only going off of things that i have read on this web page, and my have miss typed the info on the turbo pressure. But what you have described seems like a post that i have read in the past.
 
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