Car won't start

Tiny
LEWIS25
  • MEMBER
  • 1994 CADILLAC SLS
  • V8
  • FWD
  • AUTOMATIC
  • 215,000 MILES
I have 1994 Cadillac Seville SLS. I put another engine in it and now it won't start. The engine crank in the other car. I checked to see if it was firing but it wasn't.
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Friday, April 8th, 2011 AT 1:15 PM

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Tiny
JDL
  • MECHANIC
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Sometimes you need to use computer from donor vehicle. Will the engine crank? Do you have a security system?
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Friday, April 8th, 2011 AT 1:45 PM
Tiny
LEWIS25
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The engine won't crank. I changed every sensor on the engine and it is getting gas but no fire.
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Friday, April 8th, 2011 AT 2:06 PM
Tiny
JDL
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Are you saying there is no spark at the plugs?

Your security system will kill the starter and injector pulse.
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Friday, April 8th, 2011 AT 2:32 PM
Tiny
LEWIS25
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I used the alarm keypad to unlock the doors but it still won't start. Both engines were running before I swapped them.
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Friday, April 8th, 2011 AT 3:03 PM
Tiny
JDL
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Was the engine out of the same year--make--model? The control system for the engine may not work, unless the computers are the same?

Check applicable trouble codes.
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Friday, April 8th, 2011 AT 3:32 PM
Tiny
LEWIS25
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The engine came out of a 1996 Cadillac Sedan Deville.
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Friday, April 8th, 2011 AT 3:34 PM
Tiny
JDL
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The computers don't show to be the same. I don't think it will work.
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Friday, April 8th, 2011 AT 3:56 PM
Tiny
LEWIS25
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I swapped every sensor on the engine. Is there any way to make it work?
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Friday, April 8th, 2011 AT 4:19 PM
Tiny
JDL
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Can you communicate with computer, check trouble codes? Can you get the computer from donor vehicle, don't know if everything will match-up, connectors, systems?

To check for codes, ignition on, press off and warmer buttons at the climate control center, at the same time. It should go into segment check, when it does release buttons, the codes should start to show up on the driver information center. Post the codes, me or somebody will talk to you.

Also, you can check the starter circuit at the starter, the purple wire at the starter solenoid S terminal should be hot with key in the crank position. If it isn't, you need to backtrack the circuit. Any testing at the starter, you need to make sure the tranny is in park or neutral and a functional e-brake is set.
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Friday, April 8th, 2011 AT 5:19 PM
Tiny
LEWIS25
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It says P052, P109, i052, S036, S044, S060, S061, S062, and S070 all said history. P015, P055, T061 current. No ACP, No SIR, and PCM.
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Friday, April 8th, 2011 AT 6:09 PM
Tiny
JDL
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The p015 and p055, I know what they are, shouldn't have any effect on your starter circuit. I can't find the T061, don't know? I'll look some more.

I gave you the wiring info on your starter circuit, did you check it?
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Friday, April 8th, 2011 AT 6:37 PM
Tiny
LEWIS25
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It turns over. It just won't crank.
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Friday, April 8th, 2011 AT 6:41 PM
Tiny
JDL
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Cranking is starter action, so you saying it cranks good but won't start?

Engine cranking, do you have spark at the plugs and injector pulse? The po15 has to do with coolant temp sensor. The p055 has to do with throttle position sensor. I know you said you replaced all engine sensors, but, if the problem is on the wiring circuit somewhere, replacing parts won't fix it.
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Friday, April 8th, 2011 AT 6:57 PM
Tiny
LEWIS25
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It does turn over good, it just won't start up. I checked the fire at each of the coils and neither one is firing.
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Friday, April 8th, 2011 AT 7:03 PM
Tiny
JDL
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Did you check for primary voltage at the ignition module. Check ground also. Take connector loose from ignition module, key on, no need to crank. Use a testlite between pink wire and black wire at the harness connector. If the lite comes on, voltage and ground should be ok.
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Friday, April 8th, 2011 AT 7:19 PM
Tiny
LEWIS25
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I checked it with a voltmeter and it has 11.94 volts.
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Friday, April 8th, 2011 AT 7:33 PM
Tiny
JDL
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Same reading across battery posts? Some of the national brand autostores may be able to check ignition module for you. You can call and ask?
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Friday, April 8th, 2011 AT 7:38 PM
Tiny
LEWIS25
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I called and none of them can check it.
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Friday, April 8th, 2011 AT 7:44 PM
Tiny
JDL
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Do an ohms test on crank sensors, 800--1200 ohms, if they both test ok, replace the ignition module, because I don't know what else to tell you. I hate to see you throw parts at, but, I've gone about as far as I can.
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Friday, April 8th, 2011 AT 8:08 PM
Tiny
LEWIS25
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How do I test them?
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Friday, April 8th, 2011 AT 9:32 PM

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