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post #1 of (permalink) Old 09-07-2003, 05:14 PM Thread Starter
 
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Code interpretting

Ok, my fiance's car had the "service" light come on yesterday, so I pulled the codes.

She had a 31,21,41,and 11 code come up. Its on a 86 T-bird 3.8 v6. Can anyone tell me what to make of it?

My book says:
31 - (cars only) EVP or PFE circuit below min voltage
21 - cooling temperature sensor out of specified range or ECT out of range
41 - HEGO (HO2S) sensor signal out of range / always lean
11 - system ok.

I'm not sure what a EVP or PFE or ECT is.

ANOTHER QUESTION: My truck (95 bronco 5.0) keeps sending out a 538 code ((trucks only) invalid cylinder balance test due to throttle movement during test) - I never touched the trottle until after it got done throwing the codes out, and I've been getting that code for awhile now. Does anyone know what this means? Thanks in advance!!!
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post #2 of (permalink) Old 09-07-2003, 11:46 PM
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Re: Code interpretting

Exhaust Valve Position sensor - the white one on top of the EGR.
Pressure Feedback Exhaust sensor - used on later engines; has 1 hose & 3 wires.
Engine Coolant Temperature sensor - screwed into the intake or the thermostat cover.
Heated Exhaust Gas Oxygen sensor

Go to the Computer forum on Ford Trucks Enthusiasts and search for my thread called "How to pull codes". It explains what the cylinder balance test is, when & why it gets run, and has a link to havack's site where my code list is.
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post #3 of (permalink) Old 09-08-2003, 09:24 AM Thread Starter
 
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Re: Code interpretting

do you think all of those sensors are going out, or do you think that there is something wrong and the sensors are reading right. BTW, the timing hasn't been set since it was rebuilt - ~300miles ago, that could be part of the problem, but 2 out of the 3 codes just showed up in the past few days. I would have figured if it was because of the timing, they'd be there the whole time (like that 3rd code is). Anyway, thanks for your help!
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post #4 of (permalink) Old 09-09-2003, 04:52 PM
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Re: Code interpretting

Clear the codes, drive it briefly and fix the first code that comes up.

And so on, and so on.

That thing is in bad shape! If it really had a bad HEGO, EVP and ECT I would think it would run terribly, if at all.
post #5 of (permalink) Old 09-09-2003, 10:47 PM
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Re: Code interpretting

since the engine was just installed, I'd check the wiring harnesses to be sure everything is hooked up properly. i doubt all those are going out simultaneously if they were working fine before the rebuild
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post #6 of (permalink) Old 09-10-2003, 09:40 AM Thread Starter
 
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Re: Code interpretting

I'm not sure they were working before the rebuilt. She bought the car off of a guy that had abused the motor pretty badly (never changed the oil, etc). It was knocking REAL bad when we got it, so her uncle rebuilt the thing and fixed it up to good conditions, but because of time restraints, he didn't get the timing set well. He also didn't check over much of anything else, to see if it needed replacing. Long story short...the motor should be good for another few years, but I'm not sure about anything else. We've already run into problems with the alternator and battery, but they're working fine now.
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