99 tahoe issue
- Thread starter Asanford
- Start date
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Matahoe
Full Access Member
Can you please elaborate on what you mean "nasty". take a pic please and show us.
drakon543
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^^x2
if your talking coated with black nasty stuff or you pulled the plugs and the electrodes are nasty. 2 separate issues and one is alot worse. next are you talking all around sluggish or just a bad take off from a stop. lastly simplest think alot of people leave out have you had the codes pulled yet. just because the check engine light isnt on doesn't mean you dont have codes.
if your talking coated with black nasty stuff or you pulled the plugs and the electrodes are nasty. 2 separate issues and one is alot worse. next are you talking all around sluggish or just a bad take off from a stop. lastly simplest think alot of people leave out have you had the codes pulled yet. just because the check engine light isnt on doesn't mean you dont have codes.
The plugs are black and Wet!!!
Matahoe
Full Access Member
Your coolant temperature sensor might be bad or loose / broken connection at the connector.
You will want to get a scan tool that reads coolant temperature or have a diagnostics shop perform the work.
Last edited:
You can hook a multimeter up to it if you unplug from the firewall area and use the red on the 1 wire and black to a ground and use mV I think.
It does some voodoo and transmits the voltage to the gauges. No ECM or mechanical functions, that’s near the thermostat. It sits next to a spark plug on the driver side and is a $15 part.
