Weird symptoms w/no codes
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4wd High
Joined: Oct 2022
Posts: 9
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Weird symptoms w/no codes
I've got a '97 F250HD 5.8l. I'm not getting any codes with below issues. It's OBD1 and I've tried multiple times to get a good code but nothing.
If I crank the truck and drive it immediately it surges pretty bad, has a rough idle, wants to jump/lunge forward while stopped with foot on the brake, and has a general loss of power. These symptoms go away after driving for 10 minutes and drives like new. It does this every time like clock work.
When I crank it and let it idle for 10 minutes it drives like new, absolutely none of the above issues happen.
Any help is appreciated.
If I crank the truck and drive it immediately it surges pretty bad, has a rough idle, wants to jump/lunge forward while stopped with foot on the brake, and has a general loss of power. These symptoms go away after driving for 10 minutes and drives like new. It does this every time like clock work.
When I crank it and let it idle for 10 minutes it drives like new, absolutely none of the above issues happen.
Any help is appreciated.
Logistics Pro
Joined: Aug 2014
Posts: 3,556
Likes: 850
No codes would be code 111, system passed.
If your not getting that, then either the ECU has a problem, or you not retrieving codes correctly.
If your not getting that, then either the ECU has a problem, or you not retrieving codes correctly.
Logistics Pro
Joined: Nov 2013
Posts: 3,922
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From: Mojave, Ca
111 with engine problems isn't too unreasonable. These early computers didn't do a good job of actually monitoring themselves until obd2 came out.
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i ain't rite
Joined: Mar 2005
Posts: 65,450
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From: Marlboro Mental Hospital.
have you checked the idle air control for cleanliness?
have you checked the throttle body for cleanliness?
it sounds to me like the truck has a fuel delivery problem when cold, sorta like a improperly adjusted choke plate on a carbureted engine.
have you checked the throttle body for cleanliness?
it sounds to me like the truck has a fuel delivery problem when cold, sorta like a improperly adjusted choke plate on a carbureted engine.
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4wd High
Joined: Oct 2022
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yep pulled the throttle body and cleaned it. Did clean the IAC. I’ll try that and see if it helps.
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ralbach
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Oct 13, 2012 10:26 AM