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Jasper engine, no codes, loss of power...sounds like

jasper engine , no codes...
jasper engine , no codes , loss of power...sounds like ignition timing...Hmmm
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: there are no codes, and rearly it runs great...it also has new cats
JA: What is the model/year of your GM?
Customer: 2009 gmc savana g3500 w 6.0
JA: Are you fixing your Savana yourself? What have you tried so far?
Customer: yes...new cat conv. it has a jasper engine, all redun
JA: Anything else you want the mechanic to know before I connect you?
Customer: not really...Thanxs
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Answered in 47 minutes by:
11/25/2017
Chris (aka-Moose)
Chris (aka-Moose), GMC Technician
Category: GMC
Satisfied Customers: 49,962
Experience: 16 years of experience
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Is this power, loss with the engine cold or hot, at all rpm ranges?

During this power, loss does it just bog down or misfire?

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Customer reply replied 1 month ago
Power loss is hot and cold...worse hot....no codes but engine clatter ...like timing clatter.

Does this occur at all rpm ranges and loads?

Will it occur in park idling or in park revving the engine?

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Customer reply replied 1 month ago
When driving it has no power then customer said all of a sudden it ran great plenty of power for a couple of days and now its back to power loss condition. No codes.

Does this occur at all rpm ranges and loads?

Will it occur in park idling or in park revving the engine?

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Customer reply replied 1 month ago
All rpm ranges when driving....no power and very poor fuel economy.

Will your scan tool allow you to monitor fuel trims and timing?

Have you monitored the fuel pressure and oil pressure?

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Customer reply replied 1 month ago
Im going to check that in the morning...sounds like a timing issue...though I would bounce it off a fresh mind...You know.

I too agree it appears to be timing related but I just need some more information to say yes that is it as an answer.

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Customer reply replied 1 month ago
Question....does crank or cam sensor control timing or both and what is cam solinoid used for.

Normally the CMP is for ignition timing, CMP is for the injector timing. The PCM uses both though to overall get everything right. The VCT solenoid is used to control the cam gear to advance or retard the cam timing to makes the valves open and close at different times based on engine load and temp.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5-star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

Chris (aka-Moose)
Chris (aka-Moose), GMC Technician
Category: GMC
Satisfied Customers: 49,962
Experience: 16 years of experience
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Customer reply replied 1 month ago
You did a great job.....I will rate at 5 star.....Thanxs Chris

You are welcome

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