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1994 Cadillac Deville 4.9L
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28 Posts
Discussion Starter #1
ok figured out what these codes mean. now how can I fix them?
PO85 = Idle throttle angle too high
IO39 = Loss of road sensing suspension data
IO52 = Keep alive memory error

my service engine light is on plus i am getting the message "service ride control"
also the car squeaks when i drive over speed bumps. help is much appricieated:banghead:
 

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I'm a Cadillac Fanatic!
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9,575 Posts
To repair the P085 you need to clean the throttle body. The code is setting because deposits in the throttle body are blocking the air flow at idle. Hole the throttle blades wide open and spray the bores and backside of the throttle blades with carb cleaner. Scrub with an old toothbrush. Make sure that the bores down below the blade and the blade backside are clean. While you are in there....see the two tubes sticking up at you from the floor of the manifold...just below the blades..??? Those are the EGR tubes and they are not supposed to be full of carbon. Rod them out thoroughly with a piece of stiff wire. When you are done, disconnect the negative battery cable for 60 seconds to reset the idle learn offsets. That is all that is needed for that.
 
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