Idle fix, NOW WHAT?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Idle fix, NOW WHAT? in Past Cadillac Vehicle Discussion; So I cleaned out my throttle body, just like it has been posted. My idle went from 1200 to 650 ...
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    monty_n_philly is offline Cadillac Owners Member
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    Idle fix, NOW WHAT?

    So I cleaned out my throttle body, just like it has been posted. My idle went from 1200 to 650 rpm's. So everything is going good, NOT SO FAST. If I left off of the gas and just let the car roll, it will get up to 18 mph and go into 2nd gear. Is this normal? But when I stop the idle goes down to 650. So I don't understand it. Help...

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Any codes?

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    monty_n_philly is offline Cadillac Owners Member
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    Re: Idle fix, NOW WHAT?

    no check engine light.. nothing.. if i hit the arrow button, my d.i.c. is empty

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    Ranger's Avatar
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    Re: Idle fix, NOW WHAT?

    No, that does not sound normal.

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    monty_n_philly is offline Cadillac Owners Member
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    Re: Idle fix, NOW WHAT?

    I know right... by where my throttle body is .. there is a metal like cap with a black hose attached to it... the cap was covered in like grease and i had to rub to clean it. this hose is right by the throttle, where you pull it down so the body opens... if that makes sense... i can take a pic and show you what i am talkin about... i just don't know what the problem could be...

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    Submariner409's Avatar
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    Re: Idle fix, NOW WHAT?

    That rubber hose with wiggle metal cap is the transmission vent - it should be clipped to the side of the throttle cable bracket.

    ........... and simply ^/v toggling through the DIC messages won't show codes - only operating data. You need to study and use the proper sections of the sticky post ^^^ "How to pull codes". THAT turns the DIC into a code scanner-reader.

    Pictures of your engine and parts (different air intake ducting) in my albums - the Community tab, albums, the red Seville - 2 albums, 6 pages of stuff. One picture has that ^^^ transmission vent tube identified by text.

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    monty_n_philly is offline Cadillac Owners Member
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    Re: Idle fix, NOW WHAT?

    I just did it and it said that only problem was SDM B0040, which is a air impact problem. So, after I finished, I started my car and it goes to 1200 rpm and i waited 30 secs and i hit the gas... then went slowly down to 1000 rpm and then hit the gas again then went to 650 and stayed there.. after my drive to work, i will check them again.... ideas before hand....???

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    Submariner409's Avatar
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    Re: Idle fix, NOW WHAT?

    If the engine was cold/slightly warm it is perfectly normal for the startup rpm to be 1200 for maybe 20 - 30 seconds, 950 for some longer period, then down to 650 normal idle. This sequence is the electronic equivalent of a carburetor choke system "fast idle cam".

    Correct cold start procedure is to start the engine, let it step down from the 1200 rpm fast idle, then drive normally for at least 2 miles, don't go to WOT for 10 miles.

    You need to study the correct trouble code definitions - B 0040 = LF/Driver's side deployment loop resistance low (and is the code Current or History ?)

    http://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

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    monty_n_philly is offline Cadillac Owners Member
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    Re: Idle fix, NOW WHAT?

    Thanks for the rpm info. I will try it today and look at the codes and see what happens. i will time how long it takes to go from 1200 to 650... thanks sub...

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    monty_n_philly is offline Cadillac Owners Member
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    Re: Idle fix, NOW WHAT?

    Ok Sub, so heres what just happened...

    I started it and let it run, from cold (well hasn't ran in a few days, but warm in philly). it started at 1200 for 40 secs then went to 950... after 2 mins it was at 850, so I shut if off... then I ran the codes and I got 2 current ones..

    IPM B0429 ( the loop resistance low-I still don't know what that means or how to fix it) other
    SDM B0040 (rear air switch, I read up on it and no one really seats in the back, but I am going to try Rangers air control trick)...

    So I just started it again and did the air trick and I think that worked.. the car ran for about 1 min and was at 750 and slowly moving its way down. The engine is a little loud, but once idle went down, it purred nice.. so I think I m good now, since I cleaned the throttle body last week... thoughts?

    Quote Originally Posted by Submariner409 View Post
    If the engine was cold/slightly warm it is perfectly normal for the startup rpm to be 1200 for maybe 20 - 30 seconds, 950 for some longer period, then down to 650 normal idle. This sequence is the electronic equivalent of a carburetor choke system "fast idle cam".

    Correct cold start procedure is to start the engine, let it step down from the 1200 rpm fast idle, then drive normally for at least 2 miles, don't go to WOT for 10 miles.

    You need to study the correct trouble code definitions - B 0040 = LF/Driver's side deployment loop resistance low (and is the code Current or History ?)

    http://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

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    Re: Idle fix, NOW WHAT?

    I am going to try Rangers air control trick)...
    What trick was that?

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    monty_n_philly is offline Cadillac Owners Member
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    Re: Idle fix, NOW WHAT?

    I read yesterday about turning the back air all the way up... let it run... turn it down... let it run.. repeat.... then do the temperature the same way... this made my code go away...

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