Question about Mazda RX8

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I own a 2005 Mazda RX-8. When I reset my odometer after filling the gas tank, the odometer jumped from 86,000 miles to 139,000 miles, and the speedometer showed that I was traveling between 59 to 76 mph when I was actually only going about 35 mph. No gauge light is lit up. Help..is this a simple fix or a big computer problem? Will I be able to get my odometer back to the correct reading? I have documentation showing the correct reading.

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6ya6ya
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Posted on Jan 02, 2017

whispers76
  • 55 Answers

SOURCE: Gas Gauge not reading correctly

The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.

Posted on Jan 11, 2009

SOURCE: Speedometer is jumping around

The speedometer cable needs lubricating. It can be removed from the bottom where it connects to transmission, coated with graphite and reinstalled.

Posted on Apr 28, 2009

theng_dag946
  • 3 Answers

SOURCE: Gas gauge and speedometer not working

for what i had experienced is to change the fuel sender unit and speedometer gauge and recalibrate the IPC to the latest calibration.

Posted on Jun 01, 2009

Testimonial: "Very Helpful especially when money is tight and all we ask for is a simple answer without being charged that's all ppl think about is rippin ppl off."

  • 299 Answers

SOURCE: Filled up gas tank and gauge still shows empty. I

ethanol fuel effects the fuel sending unit ,even just 10% ethanol.New sending units from gm adress this.

Posted on Jun 18, 2009

emissionwiz
  • 75822 Answers

SOURCE: Gas gauge is not reading correctly. Shows a full

the problem is caused by a defective gas gauge sending unit, this part is located inside the gas tank, you must remove the gas tank to replace it.

Posted on Dec 02, 2009

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My fuel gage indicator does not work


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1 Answer

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The problem is high sulfur content fuel will cause a problem with the fuel level sending unit, and cause it to read incorrectly.

The 2 times I had this happen, I was not at my normal brand fuel ( had it happen with Shell fuel both times ).

I fueled at 1/2 tank with my normal brand, and then after another 1/2 tank fueled again, and the problem went away.

If you want, the TSB lists new revision fuel level senders, that you can drop the fuel tank, and replace your exiting one with to cure the problem.

The correct P/N depends on your truck cab & bed config, and options

PART NUMBER PART NAME
8L3Z-9A213-E Kit - Fuel Sender 2006 starting 12/8/2005 through 2008 - FFV-26 Gal Tank - 126/132 WB
8L3Z-9A213-F Kit - Fuel Sender 2006 starting 12/8/2005 through 2008 - FFV-30 Gal Tank - 139 WB
8L3Z-9A213-G Kit - Fuel Sender 2006 starting 12/8/2005 through 2008 - FFV-27 Gal Tank - 145/151/163 WB
8L3Z-9A213-H Kit - Fuel Sender 2006 starting 12/8/2005 through 2008 - FFV-36 Gal Tank - 145/151/163 WB
8L3Z-9A213-A Kit - Fuel Sender 2004 through 2008 - Gas-26 Gal Tank - 126/132 WB
8L3Z-9A213-B Kit - Fuel Sender 2004 through 2008 - Gas-30 Gal Tank - 139 WB
8L3Z-9A213-C Kit - Fuel Sender 2004 through 2008 - Gas-27 Gal Tank - 145/151/163 WB
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1 Answer

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It will not go off by itself,you will need to reset it by connecting to a diagnostic tool.Once cleared if there is any other problem then it will trigger the check engine light again.Hope this helps..

Sep 03, 2009 | 2004 Mazda RX-8

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