C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Help Diagnos - P0118. 1996 LT4

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Old May 26, 2007 | 04:04 PM
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Default Help Diagnos - P0118. 1996 LT4

Hi all,
I pulled my codes today and found a P0118 - Engine Coolant Temp Circuit high input. Is this the code for the sensor itself, and if so, am I able to tell which sensor (front or pass side)? This code appeared after I installed my LT headers. Maybe the wire is charred by the headers somewhere? If not, where should I begin my search?

Both of my cooling fans run constently, I mean from the time I start the car (even when cold) until I shut it off. I don't know what is causing this, but it started when the code appeared.

Also, I have a warm start issue. The car will not start when warm unless I press the gas pedal. Injectors? The car only has 40k miles.

The only other thing that I can think of that may give additional info is that the rear 02 sensors are unplugged due to my high flow cats, but I did not get a code for them. Thanks for any help or ideas!

Last edited by all4c4lt4; May 26, 2007 at 05:26 PM.
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Old May 26, 2007 | 06:09 PM
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Do you have the FSM? If not, I can scan and email you the pages dealing with the P0118 DTC...
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Old May 28, 2007 | 11:51 AM
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tobijohn, PM sent with my email.

ttt - anyone know about the hard start and fan issue, or is that related to P0118?

Thanks
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Old May 28, 2007 | 01:06 PM
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Originally Posted by all4c4lt4
tobijohn, PM sent with my email.
email sent but in case this comes up again, I'm going to post the pertinent pages from the FSM so if anyone searches the archives, they'll have the info here
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Old May 28, 2007 | 05:38 PM
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I'd guess the code,fan and hard start are all related. Use Tobijohn's trouble shooting chart and fix the trouble code first, good luck.
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