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idle adjustment on a 4.2 efi petty

Tech Talk for Nissan owners.

Moderators: toaddog, V8Patrol

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idle adjustment on a 4.2 efi petty

Post by ORSM4B »

Hi guys can't seem to get my idle under 1100rpm can someone explain how to adjust the idle on my TB42 efi......

Cheers Chris
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RN
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Post by RN »

could that indicate a vacuum leak?
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Post by ORSM4B »

thats what l thought but can't seem to find one....
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Post by naif »

could be an inlet manifold gasket leak, mine had one.

grab a tin of "start ya bastard" or "aero start" and spray it around your enginebay anywhere you think there could be a leak, if theres a leak revs will increase.

idle adjustment is done on the idle control valve located at the rear of the manifold near the firewall from the drivers side. i can post up a picture this afternoon if you like.
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Post by ORSM4B »

naif wrote:could be an inlet manifold gasket leak, mine had one.

grab a tin of "start ya bastard" or "aero start" and spray it around your enginebay anywhere you think there could be a leak, if theres a leak revs will increase.

idle adjustment is done on the idle control valve located at the rear of the manifold near the firewall from the drivers side. i can post up a picture this afternoon if you like.
Mate thanks that would be a great help if you could post a pic and details on how to adjust..

Cheers Chris
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Post by naif »

hey,

ok heres a picture which shows the idle adjustment screw.

Image

now from memory you twist it out to decrease revs and in to increase revs, or it could be the other way round, ive forgotten sorry.
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Post by ORSM4B »

No worries thanks mate l tried turning it but l think it's seized so sprayed wd40 on it and will try tomorrow...

Thanks again Chris...
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Post by ORSM4B »

All fixed thanks guys for all your help, without these forums alot of us would be shelling out a fortune for the things that are easy to fix ourselves.....

Thanks again Chris
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Post by naif »

no problems mate, the info i provided was from the gregories manuel for nissan patrols petrol version, in the back it has an updates section for the 92 onwards models equipped with EFI ;) best $40 i spent.
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