98 Deville won't start

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

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 4 of 4
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 98 Deville won't start in Past Cadillac Vehicle Discussion; I have a 98 Deville that cranks but won't start. It may run fine for a day or two then ...
  1. #1
    rss560 is offline Cadillac Owners Member
    Automobile(s): 1998 Deville
    Join Date
    Apr 2009

    98 Deville won't start

    I have a 98 Deville that cranks but won't start. It may run fine for a day or two then won't start. The dealer said to replace the crank sensors, so I replaced them and no luck. It also, at times died and was told to change the EGR valve as well and did, but it still died cruising down the road. I'm trying to help my parents, as a shade tree mechanic already over-charged them on a fuel pump and ignition module. Any ideas?

  2. Remove Advertisements

  3. #2
    Caddyshack100 is offline Cadillac Owners Connoisseur
    Automobile(s): 99STS,2004 Jeep Liberty Renegade,98 Deville RIP
    Join Date
    Nov 2005

    Re: 98 Deville won't start

    You first need to run codes, both history and current, this will point you in the right direction, ignore the P1599 code, stall or near stall, I think you got that one figured out. It could be several areas, even a plugged fuel filter, a bad FPR, or a plugged Cat. Without codes though, this is just shooting in the dark, post back with the codes, on top of the page you will see a sticky on how to check with your car.

  4. #3
    rss560 is offline Cadillac Owners Member
    Automobile(s): 1998 Deville
    Join Date
    Apr 2009
    Thread Starter

    Re: 98 Deville won't start

    Thanks...The current code is IPC U1255
    There are plenty in the history
    PCM P0603
    IPC B1552
    TCS C1255
    TCS C1276
    TCC U1255
    PZM B1552
    " "B1982
    " "B1983
    " "U1255
    RFA U1255
    RFA U1300

    While I was checking, I was able to start it after it struggled for fuel, but it's never consistent. Thanks for your help!

  5. #4
    ewill3rd is offline Cadillac Technician
    Automobile(s): none
    Join Date
    Nov 2005

    Re: 98 Deville won't start

    You have to have 3 things for an engine to run.
    Spark, fuel, and compression.
    Those are the basic places to start, it sounds like someone has you running backwards here.

    I usually start with fuel. Make sure you have fuel pressure. There is a pressure tap on the fuel rail for a gage. The best thing to do is install the gage and crank the engine. If the pressure shoots up to 30-40 psi then the next thing might be to look for injector pulse. A long screwdriver or mechanic's stethoscope would be good here. Have an assistant crank the engine and hold whatever you have on an injector, you should hear it clicking pretty good while the engine is cranked.
    If that is good move on to spark. Go to any parts store and get an ST-125 spark tester. Clip it on ground and pull one of the plug wires out. Connect it and crank the engine, you should see a spark across the tip of the tester.
    If that is good you can do a compression test to make sure you aren't up against a mechanical issue, but my guess is after the other tests you won't even get that far.

    You could have a bad fuel pump relay, no gas in the tank (even if the gage says you do), or some sort of wiring issues. These tests should point you to at least the right system.

  6. Remove Advertisements
    Cadillac Forums

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

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

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.


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.


Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts