Fault code 45 and erratic idle - Defender Source
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  #1  
Old June 17th, 2014, 09:19 AM
slatelacy
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Fault code 45 and erratic idle

94 d90 with 4.6 conversion. Check engine light is on, showing fault code 45. Once the truck is warmed up, the idle is up and down and will occasionally stall out at stop lights. I've cleared the code many times, but it comes back. Any ideas would be awesome! Thanks.
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  #2  
Old June 17th, 2014, 09:46 AM
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replace both oxygen sensors and clean the stepper motor. This code is for the passenger side O2 sensor.
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  #3  
Old June 18th, 2014, 04:37 PM
slatelacy
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Replaced both sensors,cleaned throttle body. Still idling weird and the check engine light is back on.
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  #4  
Old June 18th, 2014, 09:20 PM
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5 speed or auto?
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  #5  
Old June 18th, 2014, 10:24 PM
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Are the throttle springs all on correctly?
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  #6  
Old June 18th, 2014, 10:39 PM
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Check the VSS truck might not know it's stopped.
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  #7  
Old June 18th, 2014, 10:57 PM
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Quote:
Originally Posted by leastonce View Post
Check the VSS truck might not know it's stopped.
no VSS on the 94 (IIRC).

same issues. after replacing O2 sensors, i relocated the ignition amp off the diz, put on real genuine cap, rotor, and wires, checked the base idle, then swapping in the genuine IAC motor.

that seemed to do the trick.

also check the t on the hoses up front and the hose at the back of the plenum for cracks. could cause a vacuum leak.

just saying.

now i have coil packs...but i got to know that issue well owning a 94 classic for a decade.
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  #8  
Old June 18th, 2014, 11:57 PM
slatelacy
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5 speed. Truck seems to be running better, but threw fault code 44 this time and still just about dies out at warmed up idle. Very weird.
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  #9  
Old June 19th, 2014, 05:31 AM
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Also check for vacuum leaks around the intake.
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  #10  
Old June 19th, 2014, 08:52 PM
slatelacy
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Update: No vacuum leaks or bad o2 sensors. Truck completely cut off coming down a hill today and I had to pull over and restart. Still throwing 44-45 codes.
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  #11  
Old June 19th, 2014, 10:16 PM
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Quote:
Originally Posted by sloanfiske View Post
no VSS on the 94 (IIRC).
You don't remember correctly there is a VSS on a 94.

When the truck is slowing down the output of the VSS signals the ECU to get ready to start doing idle control. When the vehicle is stopped the ECU does full idle control.

Doesn't anyone ever read the documentation for the 14CUX??
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #12  
Old June 19th, 2014, 10:33 PM
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Quote:
Originally Posted by leastonce View Post
Doesn't anyone ever read the documentation for the 14CUX??
No.

VSS will definitely cause the stalling issue when coming to a stop or when coasting.
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  #13  
Old July 5th, 2014, 10:12 AM
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So how do you test the VSS

Fixin to start tracking down my stop/stutter problem. I'll hunt down the vss like y'all said on my other post but how do you test it?
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  #14  
Old July 5th, 2014, 02:27 PM
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Quote:
Originally Posted by UTRPh View Post
Fixin to start tracking down my stop/stutter problem. I'll hunt down the vss like y'all said on my other post but how do you test it?
Read the 14cux test documentation. Google is your friend.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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