Check Engine light keeps coming on
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Senior User
Joined: Oct 2002
Posts: 293
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From: Trempealeau Wisconsin
Check Engine light keeps coming on
Just the other day I was leaving the woods with a load of firewood in my 94 F-150 4X4 300-6, took off down the highway, everything was going fine until I let off the gas going down a hill and all of a sudden the check engine light popped on. I was only a couple of miles from home so I kept going, got to the bottom of the hill, got back on the gas and then the light went out. So I started thinking, ok the truck is just having a little fit. I started to down shift for my driveway, and the light came on again. I checked all the normal stuff, oil, anitfreeze, and everything was good, so I figure it has to be a sensor. Over driving it the last couple of days I have noticed that when the engine is cold the light won't come on, only when everything is warmed up, and then only when I let off the gas or it is at idle it will pop on, step on the gas and the light goes out after a couple of seconds. I am thinking O2 sensor, but don't know, and can't get the truck into the shop unitl late next week. Any ideas??? P.S. the motor has 150,000 miles on it and I replaced the O2 sensor about 50,000 miles ago. Thanks Paul
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Senior User
Joined: Oct 2002
Posts: 293
Likes: 1
From: Trempealeau Wisconsin
Check Engine light keeps coming on
Here are the codes that I got.
113-Intake Air Tempuerature (IAT) circuit open/below -40 deg. F
173- Right HEGO indicates rich
179-Adaptive Fuel lean limit reached at part throttle, right side rich.
Now what does this mean???? O2 sensor?? What else??? Thanks Paul
113-Intake Air Tempuerature (IAT) circuit open/below -40 deg. F
173- Right HEGO indicates rich
179-Adaptive Fuel lean limit reached at part throttle, right side rich.
Now what does this mean???? O2 sensor?? What else??? Thanks Paul
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Check Engine light keeps coming on
113 says your IAT is burned out, disconnected, or the wires are broken.
173 & 179 say you have an overfueling problem (leaky injector or fuel pressure regulator), or your HEGO is bad. Look for gas inside the FPR's vacuum line and do the tests in the Haynes manual for the HEGO.
173 & 179 say you have an overfueling problem (leaky injector or fuel pressure regulator), or your HEGO is bad. Look for gas inside the FPR's vacuum line and do the tests in the Haynes manual for the HEGO.
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