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sierra reving off its head! just put new carby in it...

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NickOff

Joined: Sat Jun 19, 2010 11:07 pm
Posts: 59
Location: Newcastle

Posted: Wed May 18, 2011 11:40 am

hey guys
i put a different carby in my 1990 sierra, and now its reving off its head (idle speed its sitting at 4000 revs constanly) i played around with the idle screw but its not doing anything..
any ideas?
thanks

zooky08

az supporter

Joined: Fri Nov 27, 2009 10:30 pm
Posts: 3426
Location: imbil/gympie. qld
Vehicle: 03 Jimny

Posted: Wed May 18, 2011 11:41 am

Was the gasket destroyed or put back in

atari4x4

az supporter

Joined: Mon Dec 11, 2006 10:30 pm
Posts: 34842
Location: East Radelayed
Vehicle: SV420+SV620 Vitara's

Posted: Wed May 18, 2011 11:44 am

throttle cable jammed somewhere?

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FullyZooked

az supporter

Joined: Mon Oct 25, 2010 9:01 am
Posts: 1009
Location: Bendigo

Posted: Wed May 18, 2011 12:38 pm

At idle is the primary butterfly closed? If so you have a monster air leak. Put the carby hat back on and spray carb cleaner around the sides of the carb. If the engine hesitates at a certain point, you've found your airleak.

Let us know how you get on? Could also be pilot jet related but we will rule out easy stuff first.

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