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Old 11-23-2015, 04:11 PM   #42
Big Ugly
Registered User
 
Join Date: Dec 2013
Location: Gloucester, VA
Posts: 1
Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"

I am having a few things going on with my 96 Sierra SLE 5.7L 1500 ECSB. First, my gas mileage has dropped off considerably in this past year. I was getting 15 around town, 19 on highway now it is 12.5 city, 17 highway. I have a slight stumble at idle when the engine is 'hot' (more on that later) but no engine codes are thrown for O2 sensors. My scan tool picks up nothing.

The 2nd thing weird is that the temp gauge reads at 120*. I have switched both temp sensors, but nothing is making a difference. Is there any way to test the actual temp of my truck if the gauge is off?

Any help will be most welcome.
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