Question about 1996 Cadillac DeVille

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At low speed 5-15 mph engine cuts off,all warning lites appear on dash car restarts right away. has happened about 20 times. noproblem at highway speeds. recently had code for oxygen sensor bank 1 sensor1 havn't replaced yet. problem started about 160k miles now has 177k miles. 4.6 ltr v8, vin last 10, y4tu217905.

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  • tomterrif994 Apr 09, 2011

    when the car quit there was no ck eng lite right away.sometimes it will light up then go out with no codes read. I have a scanner and read about 2 hr ago, p1406,p0172, and p0131 of which the o2 sensor i will chg directly. about the egr code p 1406 does this mean i should chg the valve?

  • tomterrif994 Apr 09, 2011

    also this is tomterrific126@yahoo.com thanks for your quick resonse!

  • tomterrif994 Apr 13, 2011

    u mention iac motor is this not a valve? removed iac had quite a bit of soot like deposit on it cleaned up with carb cleaner reinstalled,throttle body a little gummy oil deposit on flap but not too bad. everything back together.problem hasn't happened yet,we'll see thanks tom

  • tomterrif994 Apr 13, 2011

    the iac is a valve not a motor, correct? if so anyway, removed the iac,pretty sooty,cleaned w/ carb cleaner. throttle body not to bad, little gummy on plate, cleaned all replaced everything so far so good. thanks, tom!

  • tomterrif994 Apr 13, 2011

    very good we'll see what happens thanks

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The O2 sensor code should not cause a stall, the EGR might if it were stuck open but we don't see them stick and un-stick all by there self's, what you are describing is a bad idle air control valve ( motor ) we see these fail all the time and they don't generally set a code, it is a pretty easy repair it mounts right on the side of the throttle body, the best thing i can tell you is to by a new one that way you know what to look for under the hood, you need no special tools to replace the motor just some tourx bits, when you remove the motor take some carb. cleaner and clean the passage under the IAC motor.

let me know if there is any thing else i can do for you.

Posted on Apr 10, 2011

  • john nail
    john nail Apr 13, 2011

    it just depends were you buy it some call it a motor some a valve, the term used by GM is an idle stepper motor but you can call it any of the names.

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  • Master
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Hi

If the throttle body and Idle Air Control valve have not been cleaned out recently then do it now.Guess the car breathed in a lot of oil vapour through the crankcase ventilation system and it tended to gunk up the idle passage in the throttle body and the IAC valve.

Also the symptom describes that your Mass Air Flow sensor is faulty.You did not mention the code that you are getting. Take your car to the auto zone and get the code checked .Given bellow is a link for your knowledge:-

http://www.samarins.com/diagnose/checkengine.html

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com

Posted on Apr 09, 2011

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