2001 4.3 engine surge? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

91Sportside · 08-16-2008, 09:40 AM

I just bought a 2001 Sportside with 6 cyl and manual transmission. I find that after running under a load load like climbing a grade, when letting off the gas a bit, the engine surges, which at first felt like it was cutting out. Otherwise the engine idles fine and seems to run ok.
Has anyone seen this problem?

Thanks,
Steve
91Sportside

**Palf70Step** · 08-22-2008, 05:20 PM

How many miles are on the truck?

I would run it buy some place and hook a code reader to it and see if it throws any codes at you. Might just be a sensor. The 4.3 in my 2002 is hooked to an autonatic, and I sometimes feel what is a surge, but I am not sure if it the automatic(Pretty sure it is) or something else.

***Josh*** · 08-22-2008, 08:52 PM

Thats one thats hard to say without being able to drive it myself. Could be a multitude of things if it doesn't turn out being normal. I'd get the codes pulled and keep an eye on it acting funny.

91Sportside · 09-09-2008, 06:16 AM

It turns out that it was an intermittent cam sensor. I still feel something like a slight miss, probably a partially clogged injector. I have put some injector cleaner in the tank so will keep an eye on it.
The truck is much different from my 91. At 55 it is running only 1400 rpm, the 91 is at 1900 for the same speed. This means I need to downshift more as the engine runs out of power sooner. I guess the bigger wheels coupled with a lower differential ratio makes all the difference.

08-16-2008, 09:40 AM	#1
91Sportside Registered User Join Date: Oct 2004 Location: Victor, NY Posts: 21	2001 4.3 engine surge? I just bought a 2001 Sportside with 6 cyl and manual transmission. I find that after running under a load load like climbing a grade, when letting off the gas a bit, the engine surges, which at first felt like it was cutting out. Otherwise the engine idles fine and seems to run ok. Has anyone seen this problem? Thanks, Steve 91Sportside

08-22-2008, 05:20 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,672	Re: 2001 4.3 engine surge? How many miles are on the truck? I would run it buy some place and hook a code reader to it and see if it throws any codes at you. Might just be a sensor. The 4.3 in my 2002 is hooked to an autonatic, and I sometimes feel what is a surge, but I am not sure if it the automatic(Pretty sure it is) or something else. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

08-22-2008, 08:52 PM	#3
*Josh* He's got mean nasty FANGS! Join Date: Dec 1999 Location: Rockwell, NC Posts: 6,506	Re: 2001 4.3 engine surge? Thats one thats hard to say without being able to drive it myself. Could be a multitude of things if it doesn't turn out being normal. I'd get the codes pulled and keep an eye on it acting funny. __________________ 2004 K2500 Burb 1999 C3500 1985 Cutlass Supreme 1969 C-10 1967 C-10 Panel josh@67-72chevytrucks.com

09-09-2008, 06:16 AM	#4
91Sportside Registered User Join Date: Oct 2004 Location: Victor, NY Posts: 21	Re: 2001 4.3 engine surge? It turns out that it was an intermittent cam sensor. I still feel something like a slight miss, probably a partially clogged injector. I have put some injector cleaner in the tank so will keep an eye on it. The truck is much different from my 91. At 55 it is running only 1400 rpm, the 91 is at 1900 for the same speed. This means I need to downshift more as the engine runs out of power sooner. I guess the bigger wheels coupled with a lower differential ratio makes all the difference.



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