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Old 12-18-2008, 10:04 AM   #10
MT-2500
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Re: 99 4.3 Rough Idle, Low Temp, Bad Gas Mileage

Quote:
Originally Posted by dr_lee29
I'm positive the engine isn't reaching 195 degrees. I don't know how to make it get warm either, I thought the new thermostat would fix that but it didn't. I'll double check the wiring. Where is the best place to get a vacuum reading?
Some times new stat's are bad.
Take a temt reading of engine after warm up.

Take Vacuum reading with a vacuum gauge hooked to mainengine intake vacuum line.
Check vacuum at idle and at 2K rpm and post back reading.
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