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#1 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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2000 6.0L runs rough and stumbles
I have a 2000 silverado 6.0 with about 150k. just had the topend off to replace broken manifold bolts no where on cylinders!
![]() It has been running rough for awhile now. under moderate load it stumbles and has a hesitation. I changed the plugs, fuel pump and filter about a yr ago. as well as the fuel pressure regulator and 2 o2 sen. No codes come up on the scanner so im at my wits end. anyone have simaliar probs? I dont want to have to pay a dealer threw the nose to figure it out. ![]()
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#2 |
Registered User
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Location: Denison, Texas
Posts: 1,919
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Re: 2000 6.0L runs rough and stumbles
I know you replaced the fuel pump and regulator, but how is your fuel pressure. You might need to find someone (a shop maybe, doesn't have to be the dealer) who has the ability to do some live sensor data logging/scanning to check the operation while running. This may help pinpoint the source of the poor operation. When did you problems start, before or after all of the parts? Did you use AC plugs?
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1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F |
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#3 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
the problems were before all the parts. some problems went away with the new parts. like hard starting was due to the bad pressure regulator. pump was on its way out and sending unit didnt work so that was a no brainer. I have a local shop that can do a pressure check on the injectors to see if they are working. havent gottin to that yet. they also said try changing plug wires. those are original. the plugs are ac delco. it looks like it runs lean. all plugs are a very light tan almost like they were just put in with little miles and they have about 20k on them. But the shop said that these do usually run lean.
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#4 |
Still Learning
Join Date: Jul 2009
Location: Central Oklahoma
Posts: 10,108
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Re: 2000 6.0L runs rough and stumbles
Harley,
You said the shop recommended wires? Did you change them yet? I have a buddy that changed a lot of the same parts you have turned out to be one of the wires was not putting enough juice to the plug. |
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#5 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
no I havent gotten a chance to go buy a set yet. plan to this w/e after payday. thanks for the info.
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#6 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: 2000 6.0L runs rough and stumbles
it really sounds like a vacuum leak to me
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#7 |
Factory Strippers Rule!
![]() Join Date: Mar 2009
Location: Shingle Springs, CA
Posts: 707
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Re: 2000 6.0L runs rough and stumbles
Fxdxharley- any updates? I have a 2000 Sierra with a 6.0 and the same problems. I am interested to see if new plug wires help. My motor seems to have a shudder to it and it idles under 500 according to the tach.
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#8 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
no updates yet sorry. i havent gotten a chance to work on it. it does sound like your trucks is acting just like mine. mine idles around 500 too.
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#9 |
Registered User
Join Date: May 2009
Location: Kokomo, Indiana
Posts: 79
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Re: 2000 6.0L runs rough and stumbles
I have a 2000 5.3 with 140k on her! When i put it in gear it stumbles and when i hit the gas it hesitates. It doesn't do it as often on cooler days and runs great above 1,000 rpm I was originally thinking coils but i haven't replaced my plug wires yet!
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1972 K20 lwb 2000 Z71 x-cab 1970 ford f100 |
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#10 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 2000 6.0L runs rough and stumbles
have you tryed cleaning the throttle body bore of all the carbon?
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#11 |
Registered User
Join Date: Feb 2008
Location: Florala, AL
Posts: 398
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Re: 2000 6.0L runs rough and stumbles
my buddy had a lot of the same issues with his HD. we ended up changing the plugs and wires, and the knock sensors. all better. turns out the plug wires were breaking down and not putting out enough juice. the engine has two knock sensors under the intake plenium. one of which was broke of (looked rusted in two) and while we were in there we changed the other as well for added insurance. not saying thats ur prob. but if you could analize live sensor data, you could see it maybe as stated before
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#12 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
yes i did clean it. it was pretty dirty thats for sure.
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#13 |
Registered User
Join Date: May 2009
Location: Kokomo, Indiana
Posts: 79
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Re: 2000 6.0L runs rough and stumbles
Never heard of knock sensors what do they do?
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1972 K20 lwb 2000 Z71 x-cab 1970 ford f100 |
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#14 |
Registered User
Join Date: Feb 2008
Location: Florala, AL
Posts: 398
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Re: 2000 6.0L runs rough and stumbles
they pick up vibrations and detonation in the block and send that info to the computer to let it know whether to advance or retard the timing to adjust for best overall performance and such depending on set incrimites. thats a pretty basic description. otherwise... they are importand lol
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#15 |
Registered User
Join Date: Sep 2005
Location: sc
Posts: 1,203
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Re: 2000 6.0L runs rough and stumbles
It would be beneficial to find someone local that can log the truck while driving. I can probably help find a shop that has the equipment to do so that would be willing to help.
But the Knock sensors and the ignition is a good starting point. Also, do you have a K&N style filter? lots of times those are over oiled and the residue gets on the MAF sensor and that messes up things big time.
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71 Cheyenne C10 LWB cam'd 6.0/T56 Swap |
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#16 |
Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: 2000 6.0L runs rough and stumbles
Did you change the strainer on the new fuel pump?
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The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
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#17 |
Registered User
![]() Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: 2000 6.0L runs rough and stumbles
coil packs will go out from time to time, a resistance check i believe will test them...
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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#18 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
yes all filters were changed when i put the new pump in. it came with a new strainer all ready attached.
I do need to get over to my local/friends shop and have them run it with the live scanner. money is tight so i just have to deal right now. the truck is like a woman always taken money. ![]()
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() Last edited by fxdxharley; 08-26-2009 at 11:37 AM. |
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#19 |
Registered User
Join Date: Nov 2008
Location: manly iowa
Posts: 390
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Re: 2000 6.0L runs rough and stumbles
Not saying its not possible but I've worked on alot of these trucks and have yet to have a coil go bad. Wires and plugs are most comon issue. Fuel pressure regulators are very common as well. Hell i've done 4 of em this week alone.
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#20 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: 2000 6.0L runs rough and stumbles
i work on these thing everyday and i have never seena coil go out not say it isn't possible I'd change the plug wires if they haven't been changed. did u use platinum plugs when you changed them i know the newer vehicles use platinum plugs and don't really like anything else. plus plug wires should be changed with the plugs
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#21 | |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
Quote:
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#22 |
Registered User
Join Date: Nov 2008
Location: manly iowa
Posts: 390
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Re: 2000 6.0L runs rough and stumbles
Not saying that the plugs are your problem but I will not use bosch plugs. I have never had anything but problems with them. Just my experience tho.
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#23 |
Just a nother gear head
Join Date: Jul 2009
Location: Barrington NH
Posts: 501
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Re: 2000 6.0L runs rough and stumbles
well finally got around to replacing the plug wires. she runs a little better but still has the hesitation and little stumble. im thinking its fuel related now. IDK!
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2013 HD FLHX 2000 chevy 2500 6.0l 4x4 3dr 2000 harley fxdx 71 Jimmy 4x4- future crawler/ woods rig 71 blazer (C4 2wd conv project) http://67-72chevytrucks.com/vboard/s...d.php?t=523589 ![]() |
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#24 |
Registered User
Join Date: Sep 2005
Location: sc
Posts: 1,203
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Re: 2000 6.0L runs rough and stumbles
I just figured out mine....I tested the injector harness and was getting the noid light to light up but it was obvisous the cylinder was not firing, header tubes were 'cold'.
ended up having 4 of the 8 injectors not firing, I replaced those not squirting with spare ones and it runs good now. I pulled the fuel rail up and had my son turn the key and watch to see what injectors are firing. and replaced them and run test again. it can be a little mess so you might take a little more time and catch the fuel being squirted out....
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71 Cheyenne C10 LWB cam'd 6.0/T56 Swap |
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#25 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 2000 6.0L runs rough and stumbles
Im guessing no check engine light? Like posted before the MAF can go bad and not set a light. EGR valve stuck part way open, Vacuum leaks, TPS sensor with a dead spot. If you do have bosch plugs throw them away there junk. Ive always ran NGK V-power plugs there cheap and a good plug never had a problem.
have you checked fuel pressure? Key on engine off 55-62 PSI. |
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