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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5783
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 2007 H2 with 100 on it, it's mint, bought it with

Customer Question

Hey I have a 2007 H2 with 100 on it, it's mint, bought it with 92,000 on it 18 months ago, I have an intermittent power loss issue, no light, no codes, hot or cold eng temp, and environment temp makes no difference either. I replaced the fuel pump, mass air flow sensor,throttle body, air box with
K&N, trans fluid pressure switch, and other electronic valves in trans. Had prob since I bought it used.New battery and all. Voltages are good
Submitted: 10 months ago.
Category: GM
Customer: replied 10 months ago.
Add on
I also added 2 bottles of Techron, seemed better but problem still persists. All of the repairs I did definitely helped when the truck is running fine, all had a positive effect on it, BUT problem still exists. There is a drastic difference in power when problem is occurring, this issue occurs more often then not
Ty
Expert:  david craig replied 10 months ago.

Hi Im David, Check for clogged or partially clogged catalytic converters. you can do a back pressure test or you can take the temp readings of each cat going into it then coming out of it. temp coming out should be at least 100 degree hotter than going in.

Expert:  david craig replied 10 months ago.

do you still need assistance??