Skipping Trailblazer ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Restrorob · 06-25-2009, 09:35 PM

Hey All,

My brother has a 05 Trailblazer with the 4.2 L6, It started running rough at 65,000 so we replaced the plugs. This has the coil over each plug, It ran better after the plug change but still has a distinct skip like one plug isn't firing.

Question;

Can I remove all the coils from the plugs (to prevent engine start-up) and test each coil for spark with my adjustable spark tester without causing any computer damage ?

Thanks for any insight !

**bwood** · 06-25-2009, 10:47 PM

I'm thinking I read of an issue on the I6 engines where they have a motor that somehow adjusts one or both of the cams and that this motor is prone to failure. It causes poor idle and drivability/emission issues. I appologize for the poor description, but it has been a while since I read it (I think I found it here somewhere). I will do some searching and see what I can find.

**bwood** · 06-25-2009, 11:05 PM

Here is some reading:

http://wiki.answers.com/Q/What_is_a_camshaft_actuator

http://www.gm-trucks.com/forums/inde...howtopic=72278

This is all I could come up with right now.

06-25-2009, 09:35 PM	#1
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Skipping Trailblazer ? Hey All, My brother has a 05 Trailblazer with the 4.2 L6, It started running rough at 65,000 so we replaced the plugs. This has the coil over each plug, It ran better after the plug change but still has a distinct skip like one plug isn't firing. Question; Can I remove all the coils from the plugs (to prevent engine start-up) and test each coil for spark with my adjustable spark tester without causing any computer damage ? Thanks for any insight ! __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!*

06-25-2009, 10:47 PM	#2
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,919	Re: Skipping Trailblazer ? I'm thinking I read of an issue on the I6 engines where they have a motor that somehow adjusts one or both of the cams and that this motor is prone to failure. It causes poor idle and drivability/emission issues. I appologize for the poor description, but it has been a while since I read it (I think I found it here somewhere). I will do some searching and see what I can find. __________________ 1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F

06-25-2009, 11:05 PM	#3
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,919	Re: Skipping Trailblazer ? Here is some reading: http://wiki.answers.com/Q/What_is_a_camshaft_actuator http://www.gm-trucks.com/forums/inde...howtopic=72278 This is all I could come up with right now. __________________ 1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.