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Old 02-14-2016, 08:08 PM
Butcherman90 Butcherman90 is offline
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Temperature gauge reading cold
Tempature gauge on my 2001 sierra (4.8) has been running low for awhile. The highest it will reach is round 160. It's currently running rough/rich and bad mpg. I replaced the ECT sensor but didn't help. I'm not sure if there are two ECT sensors on this model. I don't think it's the cluster. Is there a second sensor I'm overlooking?
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Old 02-14-2016, 08:12 PM
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Re: Temperature gauge reading cold
Have you tried replacing the thermostat? If it is bad and stuck open it will cause the engine to run cold.
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Old 02-14-2016, 08:50 PM
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Re: Temperature gauge reading cold
I have thought of that but figured it would be closed. That's probably my problem. Thanks for the help man
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Old 02-14-2016, 09:28 PM
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Re: Temperature gauge reading cold
I'd also like to mention I've been driving this engine running cold for over 6 months. What else may I of damaged or any suggestions on anything I should check because of me driving it cold for so long?
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Old 02-14-2016, 10:07 PM
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Re: Temperature gauge reading cold
Plugs could be fouled, explaining your running rough issue. The ECU is freaking out a little due to the cold temps.

As for the thermostat I have had them fail both ways. They are technically supposed to be "fail-safe" and fail open, but that doesn't always happen. One I had fail open actually came apart and I pulled out of the housing in two pieces.
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Old 02-15-2016, 11:35 AM
Butcherman90 Butcherman90 is offline
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Re: Temperature gauge reading cold
I have uploaded a pic of my plug I just can't figure out how to post it..
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Old 02-15-2016, 12:02 PM
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Re: Temperature gauge reading cold
Quote:
Originally Posted by Butcherman90 View Post
I have uploaded a pic of my plug I just can't figure out how to post it..
Just google "spark plug appearance". You'll find pics of what is normal/abnormal.
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Old 02-15-2016, 02:17 PM
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Re: Temperature gauge reading cold
Ok. Should I replace housing also or just thermostat?
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Old 02-15-2016, 02:32 PM
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Re: Temperature gauge reading cold
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Originally Posted by Butcherman90 View Post
Ok. Should I replace housing also or just thermostat?
Usually just replacing thermo is okay. Just don't over tighten and bust a bolt or crack the housing.
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Old 02-15-2016, 02:34 PM
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Re: Temperature gauge reading cold
Ok thanks for all the help man
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Old 02-15-2016, 03:49 PM
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Re: Temperature gauge reading cold
"Jiggle hole" faces up, highest point.
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Old 02-16-2016, 07:40 AM
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Re: Temperature gauge reading cold
Thermostat fixed the problem. I really appreciate your advise.
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Old 02-16-2016, 11:02 AM
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Re: Temperature gauge reading cold
good deal
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Old 02-16-2016, 08:15 PM
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Re: Temperature gauge reading cold
That's what the forum is here for. Glad it was an easy fix.
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