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Kodak · 03-30-2012, 09:02 AM

I forgot about this for a while, but made an interesting observation yesterday that I can't interpret.

Fuel cutoff is supposed to engage above a certain rpm, right?

Well, yesterday I was engine braking in 2nd gear. The engine speed was in the low to mid 2k's, and the SG-e was reading some reasonable number that I can't recall.

Then, I felt a very minor 'bump' after the engine fell below X rpm, after which the gauge read 9999. Odd. I suspected the exact opposite. I though the injectors would cut off at high rpm, and reengage after falling below a certain value.

Do you suspect a gauge setting issue, or is this how the Canyon's Vortec 2900 works?

03-30-2012, 09:02 AM	#4 (permalink)
Kodak Master EcoModder Join Date: Feb 2011 Location: USA Posts: 346 Canyon - '07 GMC Canyon 2wd regular cab 90 day: 24.95 mpg (US) Thanks: 41 Thanked 39 Times in 24 Posts	I forgot about this for a while, but made an interesting observation yesterday that I can't interpret. Fuel cutoff is supposed to engage above a certain rpm, right? Well, yesterday I was engine braking in 2nd gear. The engine speed was in the low to mid 2k's, and the SG-e was reading some reasonable number that I can't recall. Then, I felt a very minor 'bump' after the engine fell below X rpm, after which the gauge read 9999. Odd. I suspected the exact opposite. I though the injectors would cut off at high rpm, and reengage after falling below a certain value. Do you suspect a gauge setting issue, or is this how the Canyon's Vortec 2900 works? __________________ EcoDriving: Turning more fuel into usable forward motion.