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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old Jul 7, 2024 | 08:45 PM
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From: tn
CEL

hey y’all. back again with my 92 f150. recently did a lot on the coolant system. Rad, rad hoses, thermostat, water pump. and she’s keeping good temp now. since i’ve bought the truck i’ve had a constant CEL. well after i did the coolant system it randomly turns itself off. first start the truck it’s on runs normal. as it comes to temp the light turns off at tries to die at low speeds and idle. it’s constantly on off on off. most of the time it’s on. but when it’s off it runs awful. i get into it the cel comes back and it runs normal. i’ve ran codes previously for the egr but not now since it goes off when the prob happens. im going to run them tm but i’m puzzled. what are y’all’s opinions?
 
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Old Jul 7, 2024 | 08:53 PM
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The computer stores the codes even when the CEL isn't illuminated. Run KOEO and report back with what it comes up with.
 
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Old Jul 8, 2024 | 08:12 AM
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Same here, clean the injectors through the rail and clean the throttle plate
That might help with the low idle speed
Check the codes. probably needs a new EVP sensor by now
 
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Old Jul 8, 2024 | 10:51 AM
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Originally Posted by manicmechanic007
Same here, clean the injectors through the rail and clean the throttle plate
That might help with the low idle speed
Check the codes. probably needs a new EVP sensor by now
Any idea where I can get a motorcraft EVP? Or is it worth buying a cheapo just so it works?

(I've tested mine and it has wonky resistance levels)
 
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Old Jul 8, 2024 | 03:00 PM
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From: tn
Originally Posted by Junktownbill99
The computer stores the codes even when the CEL isn't illuminated. Run KOEO and report back with what it comes up with.
did the test. came with 327,558. After the pause and flash. got 172,327,318,334,337,624,328,634.
 
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Old Jul 8, 2024 | 03:52 PM
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Originally Posted by jaybry7.tree
did the test. came with 327,558. After the pause and flash. got 172,327,318,334,337,624,328,634.
​​​​​​Wow. Ok.

The flash separates hard faults from CM codes.

Considering you have a lean code (172) and a few EGR codes, I believe your EGR system is a big air leak.

Pull the vac line off the EGR (there should be no vacuum at idle) apply vacuum to the EGR valve, if it stumbles and/or stalls, it's good.

Your EVP is probably cooked as well. Test it.

 
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Old Jul 8, 2024 | 06:21 PM
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Originally Posted by Junktownbill99
Any idea where I can get a motorcraft EVP? Or is it worth buying a cheapo just so it works?

(I've tested mine and it has wonky resistance levels)
I would check Ebay for a NOS one
Use the same color
Black is black and white is white. if you swap one color for another it will set another code
 
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