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Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: GMC
Satisfied Customers: 3840
Experience:  Owner at Carolina Auto Service &Sales , 20 years Experience in Foreign & Domestic vehicles
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2007 yukon. Cylinder 2 and 3 show misfire counts all the

Customer Question

2007 yukon. Cylinder 2 and 3 show misfire counts all the time. Causing torque reduction light
JA: Do you have the torque specs?
Customer: No
JA: Are you fixing your Yukon yourself? What have you tried so far?
Customer: I just pulled spark plug 4 and 3 out. NUmber 3 looked fine but number 4 was brown and crusty. Replaced plugs and ignition wires. Still misfiring. I checked and each cylinder has plenty of spark
JA: Anything else you want the mechanic to know before I connect you?
Customer: The Torque Reduction light is on all the time and makes transmission shift hard
Submitted: 1 year ago.
Category: GMC
Expert:  Chad Farhat replied 1 year ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 1 year ago.

1- Check the coils, swap them around and see if misfire move

2- injector on that cylinder ,is working , check power & ground , compare the power & ground to a cylinder injector not firing see if you getting same readings

3- compression check on that cylinder ?

4- vacum leaks on the intake manifold ?

do you have a scaner that can read sensors and show data stream, what is the fuel trim reading long term & short term

oxygen sensor readings the upstream ones

is the engine running open loop or closed loop on the scanner ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Chad Farhat replied 1 year ago.

Please let me know if you need anything else on it, just reply back and we will continue

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Thank You
Chad Farhat
ASE Certfied Technician