Mr.250

I just purchased a 1990 F250 5.8 for $900 from some guy on Craigslist. Even though its a rust bucket I completely fell in love with it! It has a couple of check engine lights that I need some help on fixing. I tried to look them up but im so use to my 02 Monte Carlo ss and I saw these codes and have no clue in hell what they mean lol.

KEY ON CODES
　
31= EVP circuit below minimum voltage.
　
85= Canister Purge (CANP) circuit failure.
KEY ON ENGINE RUNNING CODES
　
21= ECT out of Self-Test range MAP/BARO out of Self-Test range.
　
41= No HO2S switch detected (right HO2S).
　
18= SPOUT circuit open

I have to get all these codes fixed in order to get an inspection sticker lol so I cant drive it at all until they are fixed. Thanks in advance!!!

Bert

Code 18- There's a plug near the distributor that may be unplugged. It's grey.

Code 21-Engine coolant temperature voltage is out side the range of 0.2 to 4.84 volts. PCM pin #7, wire color is Light Green/Yellow. Possible bad sensor.

Code 31-EGR valve position (EVP) sensor signal is below 0.20 volts. PCM pin #27, wire color is Brown/Light Green. Possible bad sensor.

Code 41-Maybe it wasn't run long enough to heat it up?

Code 85-Canister purge solenoid did not respond.The self test looks for battery voltage during the solenoid off command and voltage under 1 volt during the solenoid on command issued during the self test. Solenoid resistance is 40-90 Ω. PCM pin #31, wire color is Grey-Yellow.

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Bert

Mr.250

So I just follow all the wires you mentioned to see if any are bad and if not change out the sensor? Im so use to my 02 Monte Carlo ss where I have fuses and a wrapped engine wire harness lol. Thanks for the reply!

Bert

That's pretty much what has to be done but if you could use a meter and check to make sure that's what needs to be done for sure.

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Bert