Erratic Tachometer Needle? - MG-Rover.org Forums
 
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post #1 of 5 (permalink) Old 13-05-2017, 07:24 Thread Starter
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Erratic Tachometer Needle?

Hello, was hoping someone could shed some light for me:

My 45 (2003 1.4 with a/c) has developed a bouncing rev counter needle. Sometimes it's fine but at others it will give very strange reading, either sitting at zero or flicking up to speeds that don't equate to what the engine is actually doing

Could someone tell me how this dial works??!
Where does it get the engine speed from? I hoping with this knowledge I'll be able to fix the problem.
(fingers crossed)
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post #2 of 5 (permalink) Old 13-05-2017, 10:08
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Rev counter is getting its signal from engine ECU. Do you have problems only with rev counter or some other instrument or light on cluster is also making problems?
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post #3 of 5 (permalink) Old 13-05-2017, 10:12
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As above - signal comes from the ECU, if there was a problem before the ECU the car wouldn't run, it has to be a loose plug or damaged wire.
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post #4 of 5 (permalink) Old 13-05-2017, 10:25 Thread Starter
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Ok then, sounds like I need to check between the ECU and the dash then.
The only other thing not right is that the light behind the odometer is off. I just put that down to a blown bulb.

I'll post back to let you know how I get on. Thank you both for your help. :-)
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post #5 of 5 (permalink) Old 13-05-2017, 10:32
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That light and erratic behaviour can be connected to same cause.
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