LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

pcm not getting correct coolant temperature

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Old Apr 18, 2005 | 12:58 PM
  #1  
TransAmTONY's Avatar
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From: Finally back in CALI! fck iraq!
Question pcm not getting correct coolant temperature

My coolant fans on my car have not worked for quite sometime now. I finally got around to looking at them the other day. I hooked up auto tap and let the car warm up. When my needle on the gauge was almost at redline the computer was only reading 208f. I replaced my coolant temperature sensor and everything stayed the same. Before i started chasing wires i thought i would ask to see if anyone else had this problem before or if there might be a "quick fix".
Thanks for yalls time.
-Tony
Old Apr 18, 2005 | 12:59 PM
  #2  
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Re: pcm not getting correct coolant temperature

your gauge might be reading wrong, not the PCM
Old Apr 18, 2005 | 01:11 PM
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Re: pcm not getting correct coolant temperature

Which temp sensor was replaced? There is one for the computer and one for the gauge.
Old Apr 18, 2005 | 05:31 PM
  #4  
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Re: pcm not getting correct coolant temperature

I replaced the one right by the waterpump... I also took a high temp thermometer and tested the coolant manually, Short of chasing wires I am pretty sure this is as far as i can go... can anyone confirm?
Thanks
Tony
Old Apr 18, 2005 | 06:37 PM
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Re: pcm not getting correct coolant temperature

Originally Posted by Dave89IROC
your gauge might be reading wrong, not the PCM
Like Dave says...

Your gauge appears to be wrong. Check out the sensor in the head for it.
Old Apr 18, 2005 | 07:38 PM
  #6  
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Re: pcm not getting correct coolant temperature

look at my above post...i tested the coolant manually with a high temperature thermometer and it was +/- 5f from what my gauge said...it can be the gauge or the sensor that for it.
-Tony
Old Apr 19, 2005 | 08:22 AM
  #7  
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Re: pcm not getting correct coolant temperature

it is going to be a different temp depending on where you check the coolant. I have my dash gauge reading the temp from the driver's side head like normal but i also have a autometer gauge reading the temp from the pass. side head and it is like 15 degrees hotter.
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