dtc 18 @ operating temp only - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-25-2006, 05:48 PM   #1
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Default dtc 18 @ operating temp only

you guys seem like a intelligent bunch so here'* my problem:

I own a 1992 bonnie supercharged and loaded to the ****. Beautiful car and very reliable however when something goes wrong it seems to cost a fortune and thats just for parts. I just recently had it die on me and shamefully pulled it home after not being able to repair it on the side of the road. I have found out that when it is good and cold (its -5 C here) it runs great, in fact almost top notch, burnouts, simulated drag, you name it however as soon as it reaches normal operating temp (95 C ) she decides to set a code 18 (cam/crank error) then sputter and die.
if i try to restart the engine it will do so with a little grief but will not exceed 1000 RPM, basically it idles but don't touch the gas peddle or it will stumble and sputter to death.
two or three months ago i replaced the cam sensor and even replaced a section of its wiring, and just to clear my doubts i went back to make sure my connections and wire were still good and no problems there.
my luck it'* probably the ICM or some other overpriced part.
anyways it'd be very appreciatted if someone might help point me to the problem

Rock on Pontiac DOES build excitment
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Old 02-25-2006, 06:00 PM   #2
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Does it run fine when its cold again and then die when its heated up to operating temp?

Could be your Cat Converter. Im not sure if it would throw a Cam/crank code, but you said you replaced those parts.

One way to tell is to let your car heat up and look underneath. If your Pipes are Glowing Red hot then it could be the Cat.
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Old 02-25-2006, 06:31 PM   #3
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Check the connector/connection it sounds like you may be getting a bad connection.
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Old 02-25-2006, 08:18 PM   #4
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only dies after it reaches operating temp
doesn't matter how many times i let it cool
and i'm not so sure it'* the cat because it acts up too suddenly, when its running at 80 C it still runs fine even at 90 C
i don't think it'* a bad connection cause i don't have to drive it for it die
i'm curious if it is the crank sensor because i haven't replaced it yet and maybe after 260,000 km it might be time. as well i do know that when things get hot they tend to act strange


I WILL NOT GIVE UP ! ! ! !
besides its my only ride
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Old 03-01-2006, 11:10 AM   #5
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ahh much better now. i replaced the crank sensor and cleaned the connector. thanks guys for your input.
Should last now until i pull the motor this spring for a rebuild......
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Old 03-01-2006, 11:26 AM   #6
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Glad you got it fixed, though all we did was allow you to bounce your ideas off us. I don't suppose you got any pictures of the operation, huh?
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Old 03-01-2006, 12:08 PM   #7
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Sorry dude it was too cold to spend anymore time than required and besides my car might get a complex if i started taking pictures of it during surgury. I swear it'* just like a woman, you never know when she'* gonna cost you money or how much ! !
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Old 03-01-2006, 12:13 PM   #8
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Thanks for posting the resolution. The connection/wire thing is tyipcally suggested as that is the stirst step in the manual. Possible rubbing etc.
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Old 03-01-2006, 12:16 PM   #9
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Quote:
Originally Posted by yer jealous
Sorry dude it was too cold to spend anymore time than required and besides my car might get a complex if i started taking pictures of it during surgury. I swear it'* just like a woman, you never know when she'* gonna cost you money or how much ! !
hahaha!
I kinda figured as much, but figured it was worth asking.
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Old 03-01-2006, 12:16 PM   #10
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That just goes to show how tow different car can be so different my bonnieville that most expanse thing that broke is middle coil pack was messing up which was $65, which I got for free. The average repair cost for my car is $11 I keep a spread sheet of the car repair history
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