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94 xlt weird codes

purple-x

Member
Joined
November 2, 2007
Messages
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City, State
Kingsley, Michigan
Year, Model & Trim Level
'94 XLT
im having a problem with my 94 xlt. it runs rough at idle. it wasnt throwing a cel but i went to see if there were any codes stored and i had 5. i dont remember the code numbers but i kinda remember what they were.
1. maf sensor voltage lower than expected.
2. tps voltage lower than expected.
3. exhaust gas pressure high;egr circuit voltage higher than normal.
4. egr circuit voltage lower than expected.
i dont remember the 5th one, but when mine idles rough the battery gauge fluctuates up and down if it went down far enough could that cause the computer to get confused and throw a low voltage code??? if thats the case im not throwing any codes that will help me fix this problem. my guess is that the egr and egr vacuum solenoid are bad. .. i already replaced the dpfe sensor, about three days after that is when this starting happening.
any help would be greatly appreciated. . .
 
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MrShorty

Explorer Addict
Joined
December 27, 2001
Messages
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City, State
Spanish Fork, UT
Year, Model & Trim Level
92 XLT and '87 Bronco II
1st thing I would suggest would be to repeat the KOEO test and get the code numbers. Be sure to note which are KOEO codes and which are CM codes (see my notes on pulling EEC-IV codes in the EEC-IV forum). SOP is to resolve KOEO codes first.
 
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purple-x

Member
Joined
November 2, 2007
Messages
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City, State
Kingsley, Michigan
Year, Model & Trim Level
'94 XLT
thanks ill try and get the code numbers tonight
 
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JMan689

Explorer Addict
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August 4, 2006
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City, State
Downers Grove, IL
Year, Model & Trim Level
'14 Focus ST
Clean your MAF and check for vaccumm leaks, both have caused mine to have a rough idle.
 
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