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Anyone ever have this problem?

BLOODBANE

Well-Known Member
Joined
March 3, 2007
Messages
188
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City, State
Canon City, CO
Year, Model & Trim Level
94 XLT
Not sure where this goes but here goes. I have a 94 X with the 4.0. I have cleaned the MAF, changed the plugs, air filter, TPS and IAC. I don't have a loping idle anymore, but it would only idle at around 400-500rpm(I raised the idle manually). My EZ-READ 2000 found KOER codes 412(cannot control RPM during KOER high RPM check),and 411(cannot control RPM during KOER low RPM check). I was getting a MAF and TPS codes before I changed/cleaned them. What should I look at next.
P.S. No obvious vacuum leaks,loose wires, ETC.......
 
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bikeboarder

Well-Known Member
Joined
August 24, 2006
Messages
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City, State
Spokane,WA
Year, Model & Trim Level
'91 Eddie Bauer, 92 XLT
is the IAC getting voltage?
 
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BLOODBANE

Well-Known Member
Joined
March 3, 2007
Messages
188
Reaction score
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City, State
Canon City, CO
Year, Model & Trim Level
94 XLT
Yes its getting 12.05 volts to the IAC.
 
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bikeboarder

Well-Known Member
Joined
August 24, 2006
Messages
439
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City, State
Spokane,WA
Year, Model & Trim Level
'91 Eddie Bauer, 92 XLT
if it is getting voltage and it still cant control the RPM i woud clean the IAC passages and the IAC itself then if that doesent help replace the IAC.
 
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Mud Bug 94

Explorer Addict
Joined
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City, State
Bloomingdale, N J
Year, Model & Trim Level
94 XLT-367k miles
yep.
 
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BLOODBANE

Well-Known Member
Joined
March 3, 2007
Messages
188
Reaction score
3
City, State
Canon City, CO
Year, Model & Trim Level
94 XLT
I replaced the IAC (new) when I changed the TPS. I tried another MAF today, just to make sure it wasn't the problem and checked all the wires at the coil box, problem still persists. I think I will just take it to the FORD dealership(I've had fairly good luck with the one here in town) and have them take a look at it. Thanks for the suggestions though....
 
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