1995 F150 Inline 6
The only mod I've done to the truck is unplug the airbag controller to prevent further hair loss and maintain my sanity.

A few days ago the truck wouldn't start. I did the usual troubleshooting and checked the CEL light and got 111's. I got it fired up after a shot of ether. It's running really rough and gas is coming out of the tailpipe. Now the CEL light it on and when I check the KOEO the CEL remains solid, no flashing. We had a bout of heavy rain at the time so I unplugged the computer and checked for water, nothing. Cleaned the connectors, put a little dialectic grease on and reconnected, disconnect the battery and wait, no change. Still runs rough, solid CEL and remains solid for a KOEO check.

So, the CEL remaining solid, does that mean the computer is fried? Would the truck even start at all if it was bad?

 

Is it P0111? If so, it means intake air temperature........

 

CEL on solid, means there is still a condition that the computer has an issue with.

Don't be in a hurry to fire the parts cannon, a bit more trouble shooting would be in order. Gas is coming out of the tail pipe would take an extraordinary amount of fuel to make it that far, - do you mean rich fumes or....are you seeing water drip which would likely be condensation. Or is gas really running out the tail pipe,

Drop to the basics, scan tool to see what the computer thinks is wrong, might be that air temp - check that out and test it. Since it seems to be a sudden thing, I would do a strong physical/visual on things to see, then start with fuel pressure since you can get it to fire on ether.

more testing and let us know what you discover.

 

Will do, thanks

 

That's not much description of the truck. The more we know about it, the more likely we can offer useful & relevant suggestions. Read this page & then fill in your signature:

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Usually, people start buying & changing random parts, or unplugging things. What exactly did you do, and what was the result of each test?What exactly did you use to get that code? A scanner, or a jumper wire?Are you sure it's gas? Usually, it's sooty water that smells somewhat like gas. It's nearly impossible for liquid gas to make it to the tailpipe because of all the leaks designed into the exhaust system. Next time you get the engine to run, pull the red vacuum line off the FPR:

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That's bad. Dielectric grease is electrically insulating - it should never be used where electricity is supposed to flow. That connector is designed to work dry.What are you using for the KOEO test - a scanner or a jumper wire? Read this whole page (a couple of times, if necessary):

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No.Depends on your definition of "bad". Obviously, the engine relies on the EEC to run, so there are failure modes too severe for the engine to run. But there are many MANY failure modes that allow the engine to run. But the EEC is always the LEAST-likely component to fail. Diagnose EVERYTHING else before changing the EEC.

 

Had a few minutes this morning to look a little deeper.
It is not gas coming from the tailpipe but condensation/water. It does not smell like antifreeze.
There is some smoke and it smells rich.
KOEO it sounds as if the fuel pump is constantly running.
I checked vacuum to the fuel pressure regulator and it has vacuum. I could not locate any vacuum leaks.
I tried to pull the codes via shorting the data link connector and self test pigtail. I used a 12v test light as I don't have a VOM meter with a needle. Nothing
CEL remains lit constantly whether running or during KOEO test.
Oops, I did forget one mod. I replaced the rear fuel pump about a year ago. The front tank was in bad shape so I just disconnected the electrical to the front pump and have been running off the rear tank and new pump.

Edit; I pulled the plugs and they were all carbon fouled. Nothing to indicate a blown head gasket.

 

If you're getting a P0111 code as said it's a Intake Air Temp code. This is the most common problems it causes and some of the fixes but usually in my dealing with it it's in the harness plug being corroded. Also on the fuel pump running all the time pull the fuse or relay and see if it resets it.

• The ECM will turn on the Check Engine Light and go into a failsafe mode.
• The engine may have a hard start condition.
• The engine may also have a reduction in fuel mileage.
• The exhaust may blow black smoke.

• Repairing or replacing the IAT connector
• Repairing or replacing the wiring as necessary
• Repositioning the sensor back into the air filter housing or intake air tube
• Replacing the IAT with a new sensor

 

Thanks Nitehawkjr. I will check the Air intake sensor and connectors. Is the P0111 an OBD2 code?

 

Yes it's a OBD2 code

 

...and his truck is a '95, which is not OBD2.