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Old 04-01-2014, 06:45 AM   #1
joshnosh
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Member#: 384420
Join Date: Mar 2014
Chapter/Region: International
Location: bedfordshire, UK
Vehicle:
2004 WRX
blue

Default crazy speedo and electrical problems

hi all

my cars got a fault at the moment
it had some work done a couple months back. im not sure if it started then but its been intermittent for a while

when it happens the speedo will jump up and down about 10-15mph.

(i have a video but cant post yet as im at work)

the temperature needle vibrates and gose up a little when i rev the car.
the petrol gauge is a little lower also

the rev counter is fine though (probably mechanical?)

the car also misfires at stutters bellow 2500 RPM

my thought is a grounding issue. mabey a ground not put back when the car was in the shop.

people have mentioned the main ground for the wireing loom on the manifold or similar?

where should i look for a grounds? has anyone else had this problem
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Old 04-01-2014, 10:42 AM   #2
LIChuck
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Member#: 266122
Join Date: Dec 2010
Chapter/Region: Tri-State
Location: Patchogue, NY
Vehicle:
2007 WRX Limited
UGM

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You will probably get better results if you post this in the electrical forum
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Old 04-01-2014, 10:50 AM   #3
joshnosh
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blue

Default

i posted something before in a specific forum and got nothing helpfull and very little views people don't seem to read them very much
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Old 04-01-2014, 11:14 AM   #4
bluemk3
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Join Date: Nov 2010
Location: hollidaysburg, pa (central Pa)
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2002 WRX
World Rally Blue

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Check battery terminals and grounds so check alternator wiring and engine to chassis grounds
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Old 04-03-2014, 05:47 AM   #5
joshnosh
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blue

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Quote:
Originally Posted by bluemk3 View Post
Check battery terminals and grounds so check alternator wiring and engine to chassis grounds
iv checked all the grounds i could see

where are the engine grounds?
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Old 04-03-2014, 12:00 PM   #6
Cougar4
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The main engine grounds are near the back end of the engine I believe. The trouble may be coming from the alternator due to faulty diodes inside it. Disconnect the plug on the back side of the alternator and then start the engine and see if the trouble goes away. If it does replace the alternator. When you do this test the battery warning light may turn on but that is no problem.
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