» » »

Cadillac Q&A

Ask Your Question

1991 Cadillac DeVille Question: I replaced my isc motor but my car still idles rough in drive at stop

 

Question

bigantboss, Las Vegas, NV, May 16, 2013, 09:16
 Rookie

Why does my 91 deville with a 4.9 liter idle ruff feels like it is going to die I replaced isc motor and measured where the screw sits on the throttle arm. But it still doesnt idle smooth. Is this something that will work its self out or do I need to do something else

2 Answers
Flag This
  • Medium-star Best Answer
    Greg's Orange Auto (14209 Answers) , Orange, CA - (714) 361-9386
    globalhelper May 16, 2013, 13:01
     Master

    was it adjusted properly and do you have any other codes?

    Flag This
  • Reply

    bigantboss, May 16, 2013, 15:03
     Rookie

    Ok now I was running my ac in park and my car dies and will not start. Do I have to turn up my idle?

    Flag This
  • Reply

    globalhelper, May 16, 2013, 16:17
     Master

    no ypu may have a vaccum leak or misfire issue

    Flag This
  • Reply

    bigantboss, May 16, 2013, 16:19
     Rookie

    Ok even if I didnt touch any vacume lines. And just from running the ac it can throw off timing? And I just replaced the ics last night.

    Flag This
  • Reply

    globalhelper, May 16, 2013, 17:38
     Master

    was iac adj correctly or not?

    Flag This
  • Reply

    bigantboss, May 16, 2013, 17:40
     Rookie

    Im not sure I just put it in. And put the bolt the same distance as the old one

    Reply
    Flag This
  • Answer #2

    Paul N from Paul's Auto Service, May 17, 2013, 09:27
     Enthusiast

    I agree with globalhelper the iac needs to be adjusted correctly or/and you may have vacuum leaks. I see that you are in Vegas, if it will help bring the car down to the shop and we will look at it free of charge. Without seeing the car it will be hard to give you any better advise.

    Flag This
  • Reply

    bigantboss, May 17, 2013, 09:39
     Rookie

    Ok thank you I would have to tow it because the car will not start. Whats the name of your shop

    Flag This
  • Reply

    Paul N, May 20, 2013, 08:11
     Enthusiast

    PAUL'S AUTO SERVICE
    1754 E CHARTLESTON BLVD
    LAS VEGAS, NV. 89104
    702-384-7636

    THE TOW COMPANY WE USE CHARGES $55 ANYWHERE IN TOWN. PLEASE GIVE ME A CALL IF YOU NEED THERE NUMBER.
    THANKS JOHN

    Flag This
  • Reply

    bigantboss, May 20, 2013, 12:47
     Rookie

    Thanks for all the help. I found out it was my ecm. So I changed it out

    Reply
    Flag This