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Model specific boards => Golf mk2 => Topic started by: Waspy on 20 April 2014, 21:01

Title: Crazy Rev counter.
Post by: Waspy on 20 April 2014, 21:01

So, today I changed the water pump and rocker cover gasket.

Now the rev counter sits at 7000 when idling, when I drive it stays still sometimes and others I'll will drop further to point at the fuel gauge (!) and others bounce up (down?) to 3-5k... Any ideas on what could be causing it, or anyone experienced it before? I disconnected the batter for 3 secs when off and the needle dropped back to zero. But when I turned it back on it jumped back to 7000 and stays there even when off.

Cheers guys.

Title: Re: Crazy Rev counter.
Post by: Gambit on 20 April 2014, 21:04

Check earth strap from behind the coil

Title: Re: Crazy Rev counter.
Post by: Waspy on 23 April 2014, 12:08

Quote from: Gambit on 20 April 2014, 21:04

Check earth strap from behind the coil

Yep. Thanks, the earth was all covered in oil and crap, cleaned it up and good as gold again :)

Title: Re: Crazy Rev counter.
Post by: Superspecs on 27 August 2014, 23:45

I'm having this same problem too, I'm a bit of an electrics noob though. Can you explain how to check the earth strap?

Title: Re: Crazy Rev counter.
Post by: Waspy on 28 August 2014, 00:29

Mine was earthed to the rocker cover. It should be a metal tab with wires attached to it. Mine was attached to the far back right bolt. Give it a clean, put it back on and see if it makes any difference.

Title: Re: Crazy Rev counter.
Post by: Thom89 on 28 August 2014, 00:58

Quote from: Superspecs on 27 August 2014, 23:45

I'm having this same problem too, I'm a bit of an electrics noob though. Can you explain how to check the earth strap?

Earth straps generally are heavy duty wires that connect the battery to the body/engine, both ends of the wire must be attached to their locating points, these connecting points must be clean, and free of rust to work properly, poor earthing can cause all sorts of electrical gremlins!  Earth straps can also be found on the engine block to the body, and also gearbox to body.... so when someone says "check all the earth straps" you need to identify where they are, have they been disturbed for any reason, and are they in good serviceable condition, clean and tight

Thom

Title: Re: Crazy Rev counter.
Post by: Superspecs on 28 August 2014, 08:38

Thanks for all the help guys.

That's interesting actually as I have recently changed the battery, maybe I have disturbed something.

Title: Re: Crazy Rev counter.
Post by: Sgt_Lemon on 28 August 2014, 11:04

Three posts in a row about rev counters.

Title: Re: Crazy Rev counter.
Post by: Superspecs on 28 August 2014, 17:14

Hi all,

I tried the trick of removing fuse 21 and replacing it and despite my skepticism it actually worked. All systems are now working including the MFA.

Im so chuffed! Thanks for all the help.