1992 Cadillac Deville stalling

Tiny
FATGARY05
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 165,000 MILES
I have a 92 deville that has been giving me some issues. I recently replaced the TPS, scrubbed out the butterfly throttle plate, and the ISC motor due to an unwanted acceleration, and a hard rev. It ran well for a good while. Now as of late when I gas it, it turns off
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Wednesday, March 28th, 2012 AT 1:10 AM

24 Replies

Tiny
ASEMASTER6371
  • EXPERT
What problems do you have?

Roy
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Wednesday, March 28th, 2012 AT 1:54 AM
Tiny
FATGARY05
  • MEMBER
It takes like 3 tries to start, it makes a tapping/knocking noise when it fails to start.
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Wednesday, March 28th, 2012 AT 1:59 AM
Tiny
ASEMASTER6371
  • EXPERT
Have the starter checked as it may have a broken nose.

Roy
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Wednesday, March 28th, 2012 AT 2:01 AM
Tiny
FATGARY05
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It starts, but I have to give it a little gas. What do u think would make the tapping noise, while its not running?
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Wednesday, March 28th, 2012 AT 2:37 AM
Tiny
ASEMASTER6371
  • EXPERT
There may be something broken in the starter area or you may have an internal engine failure.

Roy
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Wednesday, March 28th, 2012 AT 3:08 AM
Tiny
FATGARY05
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Ok. I just figured out the tapping sound. It's the metal peg sticking out in front of the ISC motor near the throttle. Why would it be tapping?
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Wednesday, March 28th, 2012 AT 3:12 AM
Tiny
ASEMASTER6371
  • EXPERT
The idle speed control motor is bad. It needs to be replaced.

Roy
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Wednesday, March 28th, 2012 AT 3:14 AM
Tiny
FATGARY05
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It's not even a month old.
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Wednesday, March 28th, 2012 AT 3:36 AM
Tiny
ASEMASTER6371
  • EXPERT
New or used?

Roy
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Wednesday, March 28th, 2012 AT 3:37 AM
Tiny
FATGARY05
  • MEMBER
Brand new. I think the notched end maybe loose. And that might be why its dying in idle when I first start it up, and its throwing the e30 code (isc out of range). How do u tighten it?
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Wednesday, March 28th, 2012 AT 3:53 AM
Tiny
ASEMASTER6371
  • EXPERT
You dont, setting this up is a process. The base idle has to be set before any adjustments can be made. You need to find an older tech that is familiar with this system and can set it up for you. I have not seen one of these for about 4 years.

Roy
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Wednesday, March 28th, 2012 AT 3:56 AM
Tiny
FATGARY05
  • MEMBER
I figured it out. The notched end that presses up against the two metal cables that are attached to the throttle wasn't screwed out far enough. This is what kept the car from running fluently, and is why it died. I tinkered with it, unscrewing it little by little until it started, and ran without stalling or hesitation. But after I drove it for 50 miles, as I turned it off, it still did the tapping thing? I don't know why it would do this.
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Wednesday, March 28th, 2012 AT 5:28 AM
Tiny
FATGARY05
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It stills runs a little rough when I first start driving. But it doesn't die after I fire it up. That's reassuring. But, it still throws the service engine soon, and service vehicle soon lights intermittently. Soo. I think it may be my bcm goin out.
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Thursday, March 29th, 2012 AT 3:00 AM
Tiny
JUNKIE2100
  • MEMBER
Might be the bcm, or it might be some kind of sensor. I know I have done alot of trouble shooting on my 87 seville and found that if I unplug both my temp sensors the idle speed controller goes nuts. Its basically all based off of the temperature of the engine so that could explain why it runs rough at first, the engine is cold and the sensors may be worn and out of sync, but then as it heats up runs better because it either gets a better reading or is just stuck in the general position it needs to be for that temp
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Thursday, March 29th, 2012 AT 6:33 AM
Tiny
JUNKIE2100
  • MEMBER
As far as adjustments go though, I wouldnt think it would need to be adjusted really. The throttle position sensor would be able to make the necessary adjustments if it was out of whack. If I had to guess, which obviously I do, id say temp sensors or one of the computer modules, see if unplugging both temp sensors causes any real change in its operation, if not then that is probably your issue, if it does change well it could still be them they might just only be partially functional
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Thursday, March 29th, 2012 AT 7:03 AM
Tiny
JUNKIE2100
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Oh yea, and check your alternator output. Just not at an auto parts store their machines have never helped me one bit it always comes out good regardless. If you arent getting about 13-14 volts out of it you have an alternator issue which could cause an incorrect reading of the sensors. They are based on resistance if I remember correctly so if the voltage going in isnt right the signal coming out is off
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Thursday, March 29th, 2012 AT 7:15 AM
Tiny
FATGARY05
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Thanks. So I'll try unplugging the temp sensors. How many are there, and where are they located?
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Thursday, March 29th, 2012 AT 8:59 AM
Tiny
FATGARY05
  • MEMBER
"both" lol. Gotcha. But locating, I'm kinda lost on that one.
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Thursday, March 29th, 2012 AT 9:00 AM
Tiny
JUNKIE2100
  • MEMBER
There should be two, and I cant necessarily tell you exact locations its a different engine but that info shouldnt be too difficult to come across with some google searching or if someone with the same engine can tell you. I have the infamous ht4100 in my current cadillac and I havent really gotten into my new one yet but that has a 4.9
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Thursday, March 29th, 2012 AT 9:03 AM
Tiny
JUNKIE2100
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They should be somewhere on the intake manifold, there are these bolt looking things that screw in with wires coming out, those are the sensors, one should be near the spot where the top hose to the radiator hits the engine, the other I cant really recall but once you find one you should be able to identify the other
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Thursday, March 29th, 2012 AT 9:05 AM

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