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24-07-2004, 18:35
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#1 | | MIGWeb User
Join Date: Feb 2001 Location: Caerdydd, Cymru Drives: 01 Passat 1.8T Sport
Posts: 3,716
| Rev counter needle jumping on start up. Why?
It never used to do it but now it does it nearly every time i start up the car. Why is this?  | 
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24-07-2004, 19:23
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#2 | | MIGWeb User
Join Date: Jul 2004 Location: oxford Drives: turbo astra mk3
Posts: 309
| Re: Rev counter needle jumping on start up. Why?
what do u mean jumping when u turn ignition on it jumps up 500 revs without starting it | |
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24-07-2004, 19:26
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#3 | | Admin
Join Date: Jun 2000 Location: Hampshire, UK Drives: Vectra Derv Wagon
Posts: 27,390
| Re: Rev counter needle jumping on start up. Why?
check your crank sensor
also remove the wurbo cover, under this there are two nuts/bolts holding the fuel rail onto the inlet manifold on the top of these are 3 earth wires one on one side and two n the other, make sure these are tight and good earths
all the engine sensors inc the crank sensort earth here and a loose earth caused havoc with my 4x4 system as the crank sensor wasnt earthing properly giving back rev signal to 4x4 ecu and at the same time rev needle going nuts and jumping around during cranking/starting
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24-07-2004, 19:51
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#4 | | MIGWeb User
Join Date: Feb 2001 Location: Caerdydd, Cymru Drives: 01 Passat 1.8T Sport
Posts: 3,716
| Re: Rev counter needle jumping on start up. Why?
Yeah everytime it does it my 4x4 switches off. Would it also cause the car to miss underload? | |
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24-07-2004, 20:37
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#5 | | MIGWeb User
Join Date: Feb 2001 Location: Caerdydd, Cymru Drives: 01 Passat 1.8T Sport
Posts: 3,716
| Re: Rev counter needle jumping on start up. Why?
Ok i looked at the earths and while i was playing with them the ring connector on the one by itself came off. Im just about to put one back on an i noticed that the lead has a centre core and then an outter sheilding like an aerial lead. Do they both have to be earthed? | |
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24-07-2004, 21:27
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#6 | | MIGWeb User
Join Date: Feb 2001 Location: Caerdydd, Cymru Drives: 01 Passat 1.8T Sport
Posts: 3,716
| Re: Rev counter needle jumping on start up. Why?
Dont worry its sorted now. Rev counter works fine and the 4x4 light stays off. The car still misses though but cheers for the help guys.  | |
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24-07-2004, 21:37
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#7 | | Admin
Join Date: Jun 2000 Location: Hampshire, UK Drives: Vectra Derv Wagon
Posts: 27,390
| Re: Rev counter needle jumping on start up. Why?
no problems but glad it sorted itself!! mine did the same and once tightened it was all good!! | |
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