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Is there a special tool needed to adjust the idle screw on a 1999 sonoma. Torn bits don't fit. Looks like a five star type of bit

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1999 GMC Sonoma Idle Control Valve 1999 GMC Sonoma Idle Control Valve

it is not to be adjusted,the gasket might be gone,read more about it,the screw is a Silverhill 5 Point Star Tamper Proof Bit

Posted on Apr 15, 2015

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 508 Answers

SOURCE: Star bit on front brake 2000 chevy 1500 ?

YES THEY COME IN METRIC SIZES. AND,MOST GM PRODUCTS ARE ALL METRIC THESE DAYS. GET A MERTIC SET. YOU WILL ALWAYS USE THEM AGAIN. TOOLS ARE A GOOD INVESTMENT.

Posted on Jan 24, 2009

Charlie1221
  • 61 Answers

SOURCE: Adjusting headlights

Their is a trox bit that you can pick up at your local hardware store. They should be able to get the right size.

Good luck.

Posted on Jan 28, 2009

  • 1596 Answers

SOURCE: how do i fit rear brake pads on my bmw z4

Email me For Complete Instructions, as FixYa Does not support the format the Pictures come in.
I am at aol.com with the same screen Name as here.

Posted on Mar 23, 2009

keemo68
  • 1263 Answers

SOURCE: 2007 Chevy Suburban rotor removal

this is a problem that happens alot you have to use an impact driver for this and a impact torx bit. the driver is a cylinder shaped tool with a 3/8 drive head. you get the impact torx the the impact driver and a hammer. the tool is inexpensive and will do the trick.

Posted on May 09, 2009

Molson02536
  • 3854 Answers

SOURCE: Idle seems a bit high. Need to know how to adjust and what RPM

There are a couple of things that come to mind. One is make sure the EGR Valve and intake manifold are not carboned up. I normally have to clean them every 60 to 80,000 miles. It will actually close up with Carbon and restrict air flow and make the EGR valve malfunction. 
Secondly, the diesel pump may just have a lot of wear and it is putting out too much fuel at idle. The only way this can be checked is by the dealer with a VW specific scan tool such as VAG-COM. With this tool, you can go in and look at the the pump timing and start injection quantity. 
I have the start injection quantity many times but you have to have the software and login to get the readings. Most dealers will not do this but would rather sell you a pump if it is off.
Remove the hose from the intake where it connects to the EGR valve and look at the inside with a flashlight. See how much carbon is accumulated. This may not solve this problem but will help with starting and performance issues if corrected.

Good luck and hope this helps. To adjust the Idle, it needs to be programed in to the ECM so i am thinking that it's a Carbon issues that is restricting the air flow which the ECM is compensating to keep the engine from stalling.

Posted on May 22, 2009

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