7 seconds before start.,
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 7 of 7
Northstar Engines and System Technical Discussion Discussion, 7 seconds before start., in Cadillac Engine Technical Discussion; Hi there. I was fortunate to get a 96 STS at a great price but ever since I got it ...
  1. #1
    Nottacop is offline Cadillac Owners Member
    Join Date
    Apr 2004
    Posts
    13

    7 seconds before start.,

    Hi there. I was fortunate to get a 96 STS at a great price but ever since I got it it will crank over about 7 seconds before a stumbling start. How would one correct this and how? And is this a Normal problem? Thanks in advance.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
    Join Date
    Dec 2002
    Location
    Fort Lauderdale, Florida
    Age
    49
    Posts
    9,577

    Re: 7 seconds before start.,

    Sounds like a leaking fuel pressure regulator... most common cause of a rich condition at startup that will cause those symptoms.

    With the engine idling pull the vacuum hose off the fuel pressure regulator and watch the vacuum nipple on the fuel pressure regulator for any sign of gasoline...there should not be any. The fuel pressure regulator is that small canister shaped device on the fuel rail with a vacuum line attached to it and the fuel return line exiting from it below... If the vacuum diaphragm starts to seep fuel it leaks down the vacuum line creating a rich condition in the intake manifold at startup that can cause a long crank and a stumbling start like you describe.

    One other way to diagnose if it is a rich condition causing the problem is to hold the throttle wide open just before you begin to crank. Depress the throttle completely and hold it during the crank. This will put the PCM into a "clear flood" mode that turns off the injectors and stops the fuel delivery for a moment. If the engine starts instantly (or quicker) doing this then it is likely a rich problem caused by the FPR or a dripping injector.

    If the FPR looks OK then unclip the fuel rail and lift the injectors up out of their pockets in the intake manifold so that you can see the tips of the injectors. Turn on the key to energize the fuel pump and watch the injectors for drips to see if one is leaking when turned of.

  4. #3
    brisul is offline Cadillac Owners Member
    Join Date
    Mar 2004
    Posts
    9

    Re: 7 seconds before start.,

    i recently had the same problem, thanks to the info on this forum and the helpful people,it was the fpr, when i unpluged the vacuum line i did not see any leaking fuel, it took about 5 mins for the fuel to show leaking but it came out eventually, once i changed it, it starts every time right away also no more black smoke when you jump on it

  5. #4
    Nottacop is offline Cadillac Owners Member
    Join Date
    Apr 2004
    Posts
    13

    Re: 7 seconds before start.,

    How much does a FPR cost? Also when I first start it up in the mornings I get a puff of blue smoke. Is this somewhat common with a STS that has 147000 miles on it? Thanks, Nottacop

  6. #5
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
    Join Date
    Dec 2002
    Location
    Fort Lauderdale, Florida
    Age
    49
    Posts
    9,577

    Re: 7 seconds before start.,

    Fix the FPR and get the start to where it is clean. Then run the motor hard...several WOT accels to redline upshifts....to clean the carbon out...then evaluate the start up puff. If it is not using much oil I wouldn't worry about it at all. Sounds like a car that has really been babied and has a lot of residual oil and carbon in the chambers....needs to be "exercised" frequently to keep it clean the rings loosened up and mobil.

  7. #6
    CognLac is offline Cadillac Owners Member
    Join Date
    Sep 2003
    Location
    Mesa, AZ
    Age
    34
    Posts
    89

    Re: 7 seconds before start.,

    FPR about 70 bucks from caddy dealership

  8. #7
    El Dobro's Avatar
    El Dobro is offline Cadillac Owners Connoisseur
    Join Date
    Sep 2003
    Posts
    1,471

    Re: 7 seconds before start.,

    P/N 17113340 and retails for $67.62 from GM.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting