check engine light goes on under load????
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Senior User
Joined: Dec 2007
Posts: 104
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check engine light goes on under load????
hey guys
when i go up hills my check engine light goes on and the truck seems to run a bit weaker. then on flat surface it goes off and stays off until another hill. any clues on what is could be?
when i go up hills my check engine light goes on and the truck seems to run a bit weaker. then on flat surface it goes off and stays off until another hill. any clues on what is could be?
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
Then on the top line of this forum page you will see Tech Info right next to "Read First" in red, click on that and then on OBD1 self test for instructions on getting the trouble codes using the blinks of the check engine light.
This way the computer can sometimes tell you what is wrong and saves throwing parts at it.
This way the computer can sometimes tell you what is wrong and saves throwing parts at it.
New User
Joined: Jan 2014
Posts: 14
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From: St. Petersburg, FL
my 7.3 excursion does it with a load or slamming on the throttle. If you find out anything please let me know.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Your timing isn't set right or you have an excessive amount of carbon buildup on the piston crowns. What is your timing set at right now?
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New User
Joined: Jan 2014
Posts: 14
Likes: 0
From: St. Petersburg, FL
That makes sense. Maybe I should check my timing as well..
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