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02-26-2013, 05:04 PM
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Junior Member
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2002 GMC Envoy SLE
Summit White 4.2L I6 4X4
Join Date: Dec 2012
Location: Vernon, BC
Posts: 11
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not solved
my 02 Envoy seems to surge into power when taking off from a stop. It seems almost like it is bogging and then surges in power. I have cleaned TB and replaced all plugs (GM iridium). She idles very nicely and smooth, at an idle can barely tell it is running!
Any idea why the surging or is this normal.
Thanks in advance. 
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02-26-2013, 08:14 PM
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Junior Member
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2002 Chevy TrailBlazer LS
Graystone Metallic 4.2L I6 4X4
Join Date: Feb 2011
Location: Central IL
Posts: 32
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I would install a fuel pressure gauge on it and drive it while watching the gauge and see if it drops pressure. If that is ok, Pull the front O2 out and install a back pressure gauge and watch the back pressure, Could be a converter starting to clog.
those would be the 2 things i would start out with checking
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03-13-2013, 07:47 PM
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Junior Member
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2002 GMC Envoy SLE
Summit White 4.2L I6 4X4
Join Date: Dec 2012
Location: Vernon, BC
Posts: 11
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drive by wire?
can anyone advise as to repairing or replacing the electrical for the drive-by-wire on the throttlebody? I think that this may be the cause of my surging and I am hoping there is a fix besides replacing the throttle body.
thanks. 
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03-13-2013, 10:41 PM
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Junior Member
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2002 Chevy TrailBlazer LS
Graystone Metallic 4.2L I6 4X4
Join Date: Feb 2011
Location: Central IL
Posts: 32
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If there was anything wrong with the throttle body, It would set a code right away and go into reduced power mode.
Has the front oxygen sensor been changed yet?
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03-14-2013, 03:17 AM
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Junior Member
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2002 GMC Envoy SLE
Summit White 4.2L I6 4X4
Join Date: Dec 2012
Location: Vernon, BC
Posts: 11
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Quote:
Originally Posted by byn2ools
If there was anything wrong with the throttle body, It would set a code right away and go into reduced power mode.
Has the front oxygen sensor been changed yet?
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Thanks for the reply and suggestions!
I have not replaced the 02 and I do not have any codes at all. The Envoy idles and drives great, just when press down on pedal it sort of bogs and then surges with the power. Maybe I will try the 02
thanks again
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03-14-2013, 07:49 AM
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TrailVoy Alumni
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2002 Chevy TrailBlazer LTZ
Majestic Red Metallic 4.2L I6 4X4
Join Date: Apr 2009
Location: N.Central N.J.
Posts: 2,370
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How old is your fuel filter?
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03-14-2013, 07:50 AM
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TrailVoy Alumni
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2002 Chevy TrailBlazer LTZ
Majestic Red Metallic 4.2L I6 4X4
Join Date: Apr 2009
Location: N.Central N.J.
Posts: 2,370
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How old is your fuel filter?Air filter?
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03-14-2013, 11:48 AM
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Junior Member
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2002 GMC Envoy SLE
Summit White 4.2L I6 4X4
Join Date: Dec 2012
Location: Vernon, BC
Posts: 11
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Quote:
Originally Posted by Loverotties
How old is your fuel filter?Air filter?
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Fuel filter is new, all new plugs, cleaned TB, air filter good, no codes and it idles and runs well.
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03-14-2013, 12:29 PM
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TrailVoy Alumni
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2002 Chevy TrailBlazer LTZ
Majestic Red Metallic 4.2L I6 4X4
Join Date: Apr 2009
Location: N.Central N.J.
Posts: 2,370
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What kind of plugs and gap.
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03-15-2013, 04:07 PM
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Junior Member
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2002 GMC Envoy SLE
Summit White 4.2L I6 4X4
Join Date: Dec 2012
Location: Vernon, BC
Posts: 11
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Quote:
Originally Posted by Loverotties
What kind of plugs and gap.
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plugs are GM Iridium with standard gap noted for the Envoy.
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