heres the CEL codes

17 cfi fuel control system fault or rich/lean condition indicated

31 egr positioner sensor below minimum voltage

72 insufficient manifold absolute pressure (MAP) change during dynamic response test

my obd1 is an actron basicly it says my egr and oxygen sensor is too rich. actron book says different then what this one says up above but almost in the same way. basicly whats goin on with my car when i take off sometimes it kinda bogs then the power kicks in. when i let it idle in park i can smell the strong fumes. when im at the traffic like the truck idles at 500 rms and it could kinda feel the truck pushing while im stopped. the idle will raise a tad bit in park then goes down. can anyone give me an idea what to fix. im thinking of just getting an egr valve and a oxygen sensor. thanks

 

also im not sure if the 93 explorers has map sensors? if so where are the located? cause sutozone says they do. i just had a 94 ranger 4.0 motor put in but i didnt see a map sensor. thanks guys

 

'93 4.0 doesn't use a MAP sensor.

I'd double check those codes. Your '93 should be outputting three digit codes (unless you have a '91 computer in there).

 

the truck been dealer serviced till i got a hold of it and i ended up changing engines cause both of my heads cracked.

 

if my truck been serviced at the dealer for its whole life can i go get the service records there even though its from the previous owner? i know where the truck been seerviced at the dealer

 

should i just replace the oxygen sensor?

 

SOP when resolving EEC-IV codes is to start with the KOEO codes (the first set output during the KOEO test). I'm still not convinced that those codes are even right, so I find it hard to make any specific recomendations. I don't know how your Actron code reader works: I've always just used a paper clip and counted the flashes of the CEL, so I don't know if there could be some problem with the reader communicating with the computer or something. Basically my 1st recommendation still stands: repeat the test, be sure to note which codes are KOEO and which are CM codes (don't neglect the KOER test, either), and be sure you beleive the codes you are getting.

 

i put the oxygen sensor in so we will find out tomorrow seems to run better

 

this morning the truck did good for an 1hr on my route and went back to the way it was and the same codes pulled up again. the codes came up in this order 72, 17 and 31. any ideas what i can look into? i replaced the o2 sensor. i disconnected the battery when i was replacing it.

 

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can anyone tell me the what code this is http://vids.myspace.com/index.cfm?fu...deoid=54070899

 

I know this information is out there on the internet. If you'll be patient, I'm going to walk you through this so you can see how I'm reading the flashes

1) weak flash at 0:10 -- fast codes. I'm not certain what information is in the fast codes (some say it is the same information as is in the slow codes that can be read by some scanners, others say it is information read at the factory). In any case, without a scanner, you can't get at the information in the fast codes.

2) 0:11-0:18 -- KOEO 111

3) 0:19-0:26 -- KOEO 111 (repeated)

4) ~0:35 -- Separator pulse separating KOEO codes from CM codes. KOEO (Key On Engine Off) codes (aka hard fault codes) are those that are present during the test. CM (Continuous Memory) codes are those faults that occured during normal operation, and the computer stored the code for retrieval.

5) 0:36-0:48 -- CM 172

6) 0:48-1:01 -- CM 173

7) 1:01 -1:15 -- CM 172 (repeated)

8) 1:15-1:29 -- CM 173 (repeated)

So basically, the codes are saying that it passed the KOEO test, and that it saw both a rich condition and a lean condition from the rear O2 sensor during normal operation.

1st two things I'd do:

Run the KOER test. There are several sites that describe how this is done. Basically it's the same set up as for the KOEO test, only you start the engine (and press the brake after engine id is output and goose the throttle when the goose pulse is received).

Clear CM (disconnect jumper from STI lead anytime during KOEO/CM code output) and test drive to see if I got one or the other or both of those codes back.

 

the car sputters when i take off too. cant figure it out

 

That's probably because the mixture is off somehow, which is what the O2 sensor codes are saying. The challenge now is to figure out how the mixture is off, what is causing the mixture to be off, and what to do about.

Recognize that O2 sensor codes can be among the more difficult to diagnose (especially if replacing the O2 sensor doesn't fix it).

A third thing I might do would be to pull the spark plugs and see if they indicate a rich mixture or a lean mixture.