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General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

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Old 07-24-2013, 01:13 PM   #11
Focus Jr. Enthusiast
Join Date: Mar 2013
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Location: Dayton, OH
What I Drive: 2004,Pitch Black, SVT

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Sorry after lunch brain drain. If you think the needle and the other problems you have had are unrelated then it is probably the temp sensor/sending unit if it has both listed at the parts store then one is for the gauge the other is for the computer.

Second part is this if you have failing electronics like a bad ecu or coil pack or just a wire shorting out somewhere. Humid and rainy weather tend to make the electrical problems worse. Long story short more moisture in the air can act as a bridge between to the bad component and it's need to seek the ground through the path of least resistance.
If you are good at figuring this stuff out get out the multimeter and start at the areas you know aren't working properly.

Also diagnositic wise. When you get in your car hold down the tripmeter reset button and start the car. This will turn your dash into a diagnostic center allowing you to see rpms, MAF flow, etc a detailed list at focushacks I believe and maybe it can help narrow some stuff down
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Old 07-25-2013, 06:27 PM   #12
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What I Drive: 2002 Focus ZX3 Dark Shadow Gray

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Just a shot in the dark, but it could be the alternator pigtail going bad. I have read of several people on this site with low voltage issues, dimming lights, and similar syptoms to what you describe and it the the 3 wire plug going into the alternator. There is no slack on those wires, poor design on Ford's part, but it's an easy fix. I just replaced mine for 11 bucks. Look on ebay. Not saying that's the problem but it's worth investigating.
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Old 07-29-2013, 01:40 PM   #13
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Join Date: Jul 2013
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Location: Phil Campbell, AL
What I Drive: 2000 ZX3

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After diagnosing the problems, I got to replace my head temp sensor only to find that I never plugged the harness back up. Classic rookie mistake but everything is running great so far. Thank you everyone for your input and help. It was greatly appreciated.
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