My fuel guage is giving a flactuating reading.Half the time it won't come down past the halfway mark only when the car is in motion. it never gives a correct reading. How do i fix this?
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Should be past the halfway point, so more than 40. Note, if your pressure seems to go up and down, these guages tend to go out often in Trailblazers and Envoys. All that's needed to fix, is buy a cheap stepper which is on the back of the guage itself.
more then likely, you have 1 or 2 bad cv axles. I have seen them completely seperate-making it look like you dropped a transmission...otherwise,..ck' for bad wheel bearings..it will give you a vibration on floor board all the time strt. down the road...temp guage is a diff. issue- thermostat in need,.but only buy stats at dealer or NAPA...kev-mn.
It's very unlikely that changing the spark plugs would cause the fault you describe. In fact I can't see how it could.
Your car may not be using more fuel - it may be that the fuel gauge is giving a false reading of what is in the tank.
I would suspect the fuel sender unit - it's in the fuel tank. The unit is electrically operated via a rheostat - as the float level moves up and down according to the level of fuel in the tank it alters the current - which gives a reading as your fuel gauge.
You should be able to see the electrical connectors of the sender unit on the top of the tank (you may have to remove the rear seat or a panel inside the car - above the tank). Check the wires for cleanliness and security.
If the problem persists ask a workshop for a second opinion. It's not a difficult job changing a sender unit, though I don't know how much one would cost for your vehicle.
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