check engine light code
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Elder User
Joined: Sep 2009
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From: Indiana
check engine light code
Hey guys, my engine has been running weaker, and weaker. I checked the check engine light, and it had a code 31 31 ... what does this refer to? It runs weak with bad fuel economy... Is this connected to my fuel line off the fuel pump having a leak? (I think..) That would cause my efi not to be getting enough fuel to run correctly right??
1988 302 v8
1988 302 v8
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Elder User
Joined: Sep 2009
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From: Indiana
huh, mine was 31, 31 though. Not just 31. Thanks for your help. If mine is 31, what does PFE or EVP circuit below minimum voltage of 0.24 volts refer to? I Figured it is an electronic component causing problems for the engine. I want to go back to carburated.
Lead Driver
Joined: Nov 2002
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From: Concord, NC
Code 31 (the codes are repeated during the self-test) means the closed voltage of the EGR position sensor is outside (lower than) the normal range corresponding to a closed valve position. On your 302, the EGR valve is just to the passenger side of the throttle body, mounted to the intake manifold.
You said you thought it had a fuel leak? An external fuel leak would definitely kill the fuel mileage.
You said you thought it had a fuel leak? An external fuel leak would definitely kill the fuel mileage.
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Elder User
Joined: Sep 2009
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From: Indiana
Code 31 (the codes are repeated during the self-test) means the closed voltage of the EGR position sensor is outside (lower than) the normal range corresponding to a closed valve position. On your 302, the EGR valve is just to the passenger side of the throttle body, mounted to the intake manifold.
You said you thought it had a fuel leak? An external fuel leak would definitely kill the fuel mileage.
You said you thought it had a fuel leak? An external fuel leak would definitely kill the fuel mileage.
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
If the leak is big enough it could cause a lean condition if the pump can't maintain fuel pressure and flow. If the leak is external, then fuel is leaving the tank and skipping the engine altogether, which would give you an inaccurate poor miles per gallon figure.
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From: Indiana
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Freshman User
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From: new milford,ct.
i have an 88 150 and i cant get my codes either not even with an obd1 scanner if you figure yours out let me know what you did
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Lead Driver
Joined: Nov 2002
Posts: 9,555
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From: Concord, NC
ok, thanks. I heard the oppisite, that the efi would over compensate and ask for more gas.
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