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Jay
Jay, ASE Certified Technician
Category: Chevy
Satisfied Customers: 18725
Experience:  19 years automotive experience, ASE certified
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We change all of the coil pack on the Chevy trailblazer and

Customer Question

Hi there, we change all of the coil pack on the Chevy trailblazer and am still experiencing the same problems.
Submitted: 9 months ago.
Category: Chevy
Expert:  Jay replied 9 months ago.

Hello my name is ***** ***** thank you for your question.

What is the issue you are experiencing? Is the vehicle Misfiring and running poorly?

Customer: replied 9 months ago.
at idle
Customer: replied 9 months ago.
We have changed the cam position sensor, coil packs, and spark plugs
Expert:  Jay replied 9 months ago.

Thank you.

Most common thing is what we call the Spider injector assembly. These are fairly common to go bad and the part has been updated. This spider injector assembly sits under the intake. So there is a bit of labor involved to replace it. This can cause the truck to run poorly and misfire making you think it coils and plugs when it's not.

http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/testing-the-spider-fuel-injector-1#3

http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/testing-the-spider-fuel-injector-1

If you have any more questions on this, please feel free to ask.

If not, and you're satisfied with my help, please Rate me. That is how I get credit for my work. I hope I have provided you with Excellent Service.

Thanks Jay!

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