1997 Cadillac Deville Warm start takes 3-5 seconds of crank

Tiny
VERNONITE
  • MEMBER
  • 1997 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 97,000 MILES
Warm starting takes too long and smells of flooding once it starts. Have had fuel pump, fuel filter checked. Replaced all 8 injectors no change. I found suggestion that it might be wrong coolant temperature sensor causing computer to think it is a cold start? Is this a difficult task?
Monday, February 15th, 2010 AT 1:22 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi vernonite, Welcome to 2carpros and TY for the donation.

A good place to start is check and test the thermostat and coolant temperature sensor and clean out the idle air control valve-Get back with some results
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Monday, February 15th, 2010 AT 2:14 PM
Tiny
VERNONITE
  • MEMBER
  • 2 POSTS
Would the digital dash display of coolant temperature be using the same sensor? Thermostate was replaced about a year ago and appears to be working correctly as viewed by the dash coolant temperature values. Warms up to about 196 degress in about 5 minutes and then stays there. Starting problem only occurs after driving at least 5 miles and then parking about 15-20 minutes. A short stop like a minute or two does not cause the problem. What is a idle air control valve?
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Monday, February 15th, 2010 AT 2:57 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I've looked for a engine temperature sender gauge switch -none for yours-its picking up the engine temperature from the coolant temperature sensor-also be advised the thermostat controls the engine temperature, the CTS only reads it for other purposes

Start problems might want to check and test the fuel pump relay and fuel pump/oil pressure sending unit

IACV: Idle Air Control Valve-try cleaning it out and see what happens
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Monday, February 15th, 2010 AT 3:12 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Pull the vacuum line from the fuel pressure regulator and check the regulator for passing raw fuel into the intake system. The regulator is mounted to the rail, at the rear trans end.
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Monday, February 15th, 2010 AT 11:07 PM

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