CSI: Code Scan Interpretation, Solve the mystery
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Junior User
Joined: Jun 2003
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CSI: Code Scan Interpretation, Solve the mystery
I pulled codes on my truck last night (KOEO) and need some help deciphering the codes. Here are the numbers:
3 2 7 3 2 8 6 3 4
I ran through the test several times to make sure I had the right numbers. Here are some other facts. The truck has a hesistation (bucks) at times when climbing hills. I cured this last year by replacing the EGR vacuum regulator, but the symptoms seem to be back. My fuel mileage is around 12.5 mpg. Overall, the truck seems to have poor power for this size engine (5.8L).
At times the transmission (E40D) will shift hard between 1st and 2nd, ocassionally between 2nd and 3rd. Usually it is a hard shift like I have a shift kit, other times it slams into gear.
My guess is the codes are 327, 32, 86, and 34. I think there is another problem with the EGR system which would be indicated by the 327, 32, and 34 codes. I just not sure about the 86 code which is 3-4 shift solenoid circuit failure, since the hard shifts are not always in this gear sequence. Any other ideas on the codes?
3 2 7 3 2 8 6 3 4
I ran through the test several times to make sure I had the right numbers. Here are some other facts. The truck has a hesistation (bucks) at times when climbing hills. I cured this last year by replacing the EGR vacuum regulator, but the symptoms seem to be back. My fuel mileage is around 12.5 mpg. Overall, the truck seems to have poor power for this size engine (5.8L).
At times the transmission (E40D) will shift hard between 1st and 2nd, ocassionally between 2nd and 3rd. Usually it is a hard shift like I have a shift kit, other times it slams into gear.
My guess is the codes are 327, 32, 86, and 34. I think there is another problem with the EGR system which would be indicated by the 327, 32, and 34 codes. I just not sure about the 86 code which is 3-4 shift solenoid circuit failure, since the hard shifts are not always in this gear sequence. Any other ideas on the codes?
Elder User
Joined: Sep 2004
Posts: 941
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The evidence Greg; look at the evidence....
We have another suspect in this case
327 (EGR sensor voltage below minimum)
328 (EGR closed valve voltage lower than expected)
634 (MLPS sensor out of self test range, or AC on)
Codes 327 and 328 are consistent with a bad DPFE. Might or might not explain the hesitation. I had to look at your other posts to find you have a '92, which would have an EVP, not a DPFE. I don't know if Ford would have used code 327 for an EVP in '92 or not.
Make sure you shut the defroster off before collecting codes. If code 634 repeats, you could have a problem with the MLPS on the side of the transmission, which is a very common cause of hard shifts (do a search on "E4OD performance mode")
A real code 3-4 solenoid faillure would result in the transmission not shifting into certain gears. Code 86 is also listed as "adaptive fuel rich limit reached", which might indicate fuel starvation (your hesitation on hills). Check your fuel pressure and change the fuel filter if you haven't done so recently.
We have another suspect in this case
327 (EGR sensor voltage below minimum)
328 (EGR closed valve voltage lower than expected)
634 (MLPS sensor out of self test range, or AC on)
Codes 327 and 328 are consistent with a bad DPFE. Might or might not explain the hesitation. I had to look at your other posts to find you have a '92, which would have an EVP, not a DPFE. I don't know if Ford would have used code 327 for an EVP in '92 or not.
Make sure you shut the defroster off before collecting codes. If code 634 repeats, you could have a problem with the MLPS on the side of the transmission, which is a very common cause of hard shifts (do a search on "E4OD performance mode")
A real code 3-4 solenoid faillure would result in the transmission not shifting into certain gears. Code 86 is also listed as "adaptive fuel rich limit reached", which might indicate fuel starvation (your hesitation on hills). Check your fuel pressure and change the fuel filter if you haven't done so recently.
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Junior User
Joined: Jun 2003
Posts: 76
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Sorry about not mentioning the year of the truck. It is listed in my signature, just place your curser over "signature" at the top right of the post to get that information. The defroster was not on when I checked the codes. I'll try the search on the transmission later when I have more time. Thanks for your help. I'll probably take the truck to a neighbor who has a scan tool to get the final anwser.
