| VT - VX Holden Commodore (1997 - 2002) Talk about anything relating to the VT - VX Holden Commodore. |
19-02-2008, 05:41 PM
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Ride: VT Exect.wagon
Join Date: Feb 2008
Posts: 14
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VT missfires only at 80k.
My VT 6 wagon missfires when it gets to 80k even under slight load.It doesn't do it at any other speed.Anyone have any ideas?
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19-02-2008, 07:08 PM
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Donating Member
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Ride: WH II Caprice, 5.7
Join Date: Jun 2005
Location: Eschol Park, Sydney
Posts: 2,334
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Quote:
Originally Posted by jindy
My VT 6 wagon missfires when it gets to 80k even under slight load.It doesn't do it at any other speed.Anyone have any ideas?
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Plugs or leads, most likely a bad lead.
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19-02-2008, 07:12 PM
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Ride: VT Series 1 V6
Join Date: Jan 2008
Posts: 87
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Bad lead. I had exactly the same problem a few weeks ago.
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19-02-2008, 07:59 PM
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Donating Member
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Ride: VS EXECUTIVE S2 V6
Join Date: Jan 2008
Posts: 25
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leads (and plugs if they havent been changed regularly) Id go genuine holden on the leads they are well priced and great quality, NGK on the spark plugs
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20-02-2008, 05:44 AM
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Ride: VT Exect.wagon
Join Date: Feb 2008
Posts: 14
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Have new plugs and leads -not GMH but top quality. I agree, could still be a lead though.
The computer doesnt read anything wrong.Just wondering if it could be an EGR valve, oygen sensor or even a fuel pump.Can these be ruled out?
The VT has 170,000k's on it.
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20-02-2008, 06:21 AM
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Donating Member
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Ride: WH II Caprice, 5.7
Join Date: Jun 2005
Location: Eschol Park, Sydney
Posts: 2,334
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Quote:
Originally Posted by jindy
Have new plugs and leads -not GMH but top quality. I agree, could still be a lead though.
The computer doesnt read anything wrong.Just wondering if it could be an EGR valve, oygen sensor or even a fuel pump.Can these be ruled out?
The VT has 170,000k's on it.
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You can rule out those three items.
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20-02-2008, 02:42 PM
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Ride: VT Series 1 V6
Join Date: Jan 2008
Posts: 87
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Check the new plugs to ensure that you haven't damaged one. I found this out the hard way by cracking several plugs by over tightening them.
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20-02-2008, 05:44 PM
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Ride: VT Exect.wagon
Join Date: Feb 2008
Posts: 14
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Yeah good idea -thanks again guys.
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20-02-2008, 06:35 PM
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Master Hippo.
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Ride: 05' VZ Wagon, 04 Husky TE250 & 05 Husky TE450
Join Date: Mar 2005
Location: Nowra, NSW
Posts: 2,234
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throttle position sensor?
__________________
 Like what you read, Then hit the scales |
20-02-2008, 09:54 PM
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Ride: vx
Join Date: Aug 2007
Posts: 1,042
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As stated ^, most likely an ignition lead or plug, however, that doesnt mean it couldnt be a lot of other things.
Typically there is more chance of a miss when you have the car underload at relatively low rpm as more voltage is needed to jump the spark gap......a dodgy lead or plug may leak the spark at this higher voltage.
Is it an auto or manual, what rpm are you doing at 80km/h. Whatever rpm that is try the car at that rpm in the other forward gears under varying load to try and simulate the fault, one would expect if a lead or plug is the problem that you would be able to simulate the prob at the same engine load at different speeds.
a good test for pesky leads is to check under the hood while the engine is running in the dark. You just might be able to see small arcing around where a lead is leaking current.
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21-02-2008, 07:21 AM
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Ride: VT Exect.wagon
Join Date: Feb 2008
Posts: 14
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I will try the dark test tonight.
Thanks!
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21-02-2008, 03:08 PM
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Grandpa
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Ride: VT V6 Exec & VN V6 Exec
Join Date: May 2004
Location: Mornington Peninsula
Posts: 2,714
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take the centre plug on the drivers side out & check the porcelain for tracking marks...
dont ask how i can be so specific but its worth doing.
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21-02-2008, 08:20 PM
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Master Hippo.
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Ride: 05' VZ Wagon, 04 Husky TE250 & 05 Husky TE450
Join Date: Mar 2005
Location: Nowra, NSW
Posts: 2,234
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Quote:
Originally Posted by Doctor Bob
take the centre plug on the drivers side out & check the porcelain for tracking marks...
dont ask how i can be so specific but its worth doing.
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you sound pretty confident, like you've fixed this many times before 
__________________
Like what you read, Then hit the scales
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21-02-2008, 09:26 PM
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