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Old 07-12-2011, 12:17 PM   #4 (permalink)
Kodak
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Join Date: Feb 2011
Location: USA
Posts: 346

Canyon - '07 GMC Canyon 2wd regular cab
90 day: 24.95 mpg (US)
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Went for a drive today with one of the mechanics. He assured me that the clutch is not the problem. The slight hesitation is not atypical for a 4cyl engine he said.

When I told him that most of the mileage is low rpm around town he said that carbon buildup may be playing a role here. I already had a can of BG 44k in it (added it about 2 weeks ago), but since I'm at 3/4 tank, not much of the cleaner has made its way through the injectors.

I'm planning on doing some harder acceleration this tank, running in down to ~1/8 to go through the cleaner, and doing some highway miles at the end of July.

Is there anything else I should do to really clean out the built up carbon? My buddy said I should have used sea foam (instead of BG), but I had heard good things and wanted to try it.

Update: I cleaned out the throttle body (it was pretty dirty) with CRC throttle body cleaner. Upon start up, the revs jumped about 500 rpm higher than normal, then settled down. I suspect that the airflow has been improved.

I also gave the MAF sensor a once over with CRC MAF cleaner (it appeared clean, but figured I'd do it anyway).

My plan is to run down the tank and let the 44k work some of the carbon out. The lead mechanic at the dealership seems to have a lot of faith in this product. I'll post back with my observations.

Last edited by Kodak; 07-15-2011 at 08:40 PM.. Reason: Update
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