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Thread: 1999 Deville wont start after engine swap?

  1. #1
    aac123 is offline Cadillac Owners Fanatic
    Automobile(s): 2001 Deville DTS
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    1999 Deville wont start after engine swap?

    Hello, i swapped a blown 1999 engine with a norms 1999 engine, both devilles.

    got all hooked up and it cranks all day strong but wont fire up just cranks...

    Things I have checked...

    Fuel pump on and running

    Fuel coming out of service port strong

    relays all electrical

    triple checked all grounds, fuses, relays and all electrical

    wires and plugs triple checked

    2 diff new batterys


    If you got any ideas thanks alot. If I figure it out Ill post back...


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  3. #2
    aac123 is offline Cadillac Owners Fanatic
    Automobile(s): 2001 Deville DTS
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    Re: 1999 Deville wont start after engine swap?

    Could it be a security thing not letting the injectors work???

    I took the donor cars computer under the air box, the brake computer, and the one under glove box.

    Do I need to swap something on the steering wheel or cluster????

    Thanks

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 Deville wont start after engine swap?

    Are you using the donors key?

  5. #4
    aac123 is offline Cadillac Owners Fanatic
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    Re: 1999 Deville wont start after engine swap?

    no im not, do i need to do one of the following

    A. Switch donor ignition lock

    B. Put original computers back on instead of donors?

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 Deville wont start after engine swap?

    I think so. The security system is reading the wrong key code. Why did you swap PCM's?

    OR I think you can reprogram your key. Might try this first.
    http://www.cadillacforums.com/forums...-pk3-keys.html

  7. #6
    aac123 is offline Cadillac Owners Fanatic
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    Re: 1999 Deville wont start after engine swap?

    Quote Originally Posted by Ranger View Post
    I think so. The security system is reading the wrong key code. Why did you swap PCM's?

    OR I think you can reprogram your key. Might try this first.
    http://www.cadillacforums.com/forums...-pk3-keys.html
    I just left everything plugged up on the wiring harness, unhooked from under glove box and fuse block then laid pcm on top of engine when i dropped cradle.

    I think i need to put all original computers back in. Ill let you know tomorrow.

    Thanks alot

  8. #7
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
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    Re: 1999 Deville wont start after engine swap?

    Yup - Ranger has you on the right track - the key does match up go with that PCM. For a test, you can try bypassing the VATS system by disconnecting the (yellow?) wire under the steering column.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 Deville wont start after engine swap?

    Tateos, he has a '99. Does that still have VATS? I thought it may have the newer PASSKEY.

  10. #9
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    Re: 1999 Deville wont start after engine swap?

    Keep your car's PCM and you don't need to change the lock cylinder. Make sure all four igintion module plugs are plugged into the ignition control module.

  11. #10
    aac123 is offline Cadillac Owners Fanatic
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    Re: 1999 Deville wont start after engine swap?

    Thanks alot guys this morning I switched the pcm and the one under the glove box. Boom it started right up. Amazing they program the car to do everything but let the fuel injectors to prevent starting.

    So how would I convert the mileage of donor engine into the blown engine body? Do I need to swap cluster, ignition lock, and all computers?

    This was my original intent, to switch the mileage...

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 Deville wont start after engine swap?

    I forget if the mileage is stored in the PCM or the DIC, but be advised I think that is illegal. I think the mileage is supposed to stay with the car, not the engine.

  13. #12
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
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    Re: 1999 Deville wont start after engine swap?

    Quote Originally Posted by Ranger View Post
    Tateos, he has a '99. Does that still have VATS? I thought it may have the newer PASSKEY.
    Oh - sorry - you're probably right, Ranger

    Richard Moore


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