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Old 01-03-2015, 02:50 PM   #1 (permalink)
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Cam timing on Scangauge

My truck has the four cylinder inline engine with VVT on the exhaust camshaft. Does anybody know how to display the cam timing on a Scangauge?

My reason for this is to track down some interesting behavior. At 55 MPH in fifth gear (1800 RPM) and 7 PSI MAP (about 15 In Hg vacuum), the Scangauge sometimes shows about 37 instantaneous MPG, and sometimes shows about 43 instantaneous MPG. I'm wondering if this is somehow related to cam timing, and if so, if that mode can be extended to higher MAP.

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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.

22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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Old 01-03-2015, 04:55 PM   #2 (permalink)
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Excellent question, but one that requires digging into the communications between the ECU and the VVT control mechanism:

• If the control is electronic-based, you'll just have to find the PID code and program the SGII to read it.

• However, if the control is hydraulic/oil-based, you're probably *out-of-luck* unless you can find the oil passage and stick a pressure gauge into it to 'read' changes in pressure as the VVT operates.

Last edited by gone-ot; 01-03-2015 at 07:41 PM..
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Old 01-03-2015, 06:47 PM   #3 (permalink)
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Try emailing scangauge. The cam actuator s controlled by oil, but that oil is controlled by a solenoid, controlled by the ecm. I saw on other forums that Mazda guys can see their valve timing on their SG, and I know a GM scan tool can display what you're looking for and more, so I think this should definately be possible
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Old 01-03-2015, 08:47 PM   #4 (permalink)
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Quote:
Originally Posted by 2000mc View Post
I saw on other forums that Mazda guys can see their valve timing on their SG
If they can see cam timing, I certainly ought to be able to see cam timing. I just need to figure out how.

The SG web site does not list cam timing under general gauges, GM vehicles, or VPW. I found a list of known X-gauges on another site. No cam timing for either Mazda or GM vehicles there.

I sent an email to ScanGauge.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.

22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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Old 01-07-2015, 01:03 PM   #5 (permalink)
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Got my answer from ScanGauge: "Unfortunately, we do not have camshaft timing available for GM vehicles."

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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.

22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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