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Thad in AR. 
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Joined: 12 Sep 2009
Location: Arkansas
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 Topic: GMC 6.0 gas running rough
Posted: 26 Sep 2024 at 5:46am |
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I recently thought I got some bad gas.
I ran a can of sea foam through it after a fuel filter change.
Didn’t seem to help. It runs normal down the road until you start to pull a hill then it will sputter. If you gas it and kick it down it clears up and does fine.
Also sputters when taking off from a stop.
No engine lights are on.
My next step will be plugs and wires.
Should I get the kit with coils as well?
Any other ideas?
It’s due plugs and wires anyway but I’m hoping that’s it.
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ekjdm14
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Joined: 20 Aug 2024
Location: Manchester UK
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Posted: 26 Sep 2024 at 7:17am |
May well be no warning lights on, but you could do a lot worse than look for any codes if you have access to a reader. Many issues can be "pending" meaning the light won't be triggered until it occurs a given amount of times but you'll still have a code or two, also live data can give clues (things like comparing MAF or MAP readings at a given RPM with known-good data available online, which can tell out a vacuum leak, or long term fuel trims being more than 10% either way giving you a clue as to whether it's going rich or lean, or in your case misfire counters may tell if it's a specific cylinder/s a single bank or the whole engine acting out).
Still do plugs/wires as it's due, but don't "parts cannon" anything else without having some direction from the numbers.
Edited by ekjdm14 - 26 Sep 2024 at 7:19am
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Hubert (Ga)engine7
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Joined: 12 Sep 2009
Location: Jackson Cnty,GA
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Posted: 26 Sep 2024 at 8:09am |
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I had basically the same problem with my F150, 5.4 engine, but it did finally show a cylinder 5 misfire. It threw this code twice but cleared on it’s own both times. I figure it may have been gas with too much ethanol. It has run good after a couple of fill ups from a better gas station. I hope it’s not the ECM wanting to go south on me.
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Just an old country boy saved by the grace of God.
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desertjoe
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Location: New mexico
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Posted: 26 Sep 2024 at 8:13am |
Well,,Ole Buddy,,those right there are the issues that make you want to light a fire in it,,,BTDT,,,A Good OBDII reader is what is needed for guidance for a starting point,,,,,AND ,,,I happen to have one,,,,  if you can keep ole Faithful running for a bit longer,,,,I'm thinking I'll be able to hand my OBDII to you before too long,,,,,
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Thad in AR.
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Location: Arkansas
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Posted: 26 Sep 2024 at 8:39am |
 desertjoe wrote:
Well,,Ole Buddy,,those right there are the issues that make you want to light a fire in it,,,BTDT,,,A Good OBDII reader is what is needed for guidance for a starting point,,,,,AND ,,,I happen to have one,,,, if you can keep ole Faithful running for a bit longer,,,,I'm thinking I'll be able to hand my OBDII to you before too long,,,,, |
How long??? 😀
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Pat the Plumber CIL
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Location: Springfield,Il
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Posted: 26 Sep 2024 at 9:10am |
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What year, I had the same problem with a 2000 vortec. On the fuel bar there is a small rubber hose attached to fuel pressure "gizmo" on the bar . Pull hose off ,if fuel squirts out diaphragm inside has ruptured and is messing up fuel pressure to injectors. Mine was a 5.3 but was doing exactly what yours is . Wish I knew exact terminology and may not be related but easy fix it it is. Fuel pressure regulator maybe
Edited by Pat the Plumber CIL - 26 Sep 2024 at 9:14am
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You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails
1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF.
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Coke-in-MN
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Joined: 12 Sep 2009
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Posted: 26 Sep 2024 at 9:38am |
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Fuel pressure regulator is one item that was a recall on engine , other thing is dirty fuel rail - have codes read . bad EGR is another item on list .
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Gerry D17
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Posted: 26 Sep 2024 at 12:44pm |
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Run all the gas out of the tank .Change plugs, wires and filter fill with fresh gas and if that does not help go to a shop and get them to diagnose it. JMO
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HudCo
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Posted: 26 Sep 2024 at 6:38pm |
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check misfire counts probley bad coil
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Ed (Ont)
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Posted: 26 Sep 2024 at 6:46pm |
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Fuel pump? What year is it and what mileage?
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Darb210
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Posted: 26 Sep 2024 at 8:07pm |
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clean the throttle body butterfly plate!!
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Thad in AR.
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Posted: 19 hours 45 minutes ago at 5:32am |
Ed (Ont) wrote:
Fuel pump? What year is it and what mileage? |
2000 just replaced the fuel pump about 3 months ago. 600000 miles on it.
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Gary
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Joined: 13 Sep 2009
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Posted: 17 hours 1 minutes ago at 8:16am |
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WOW
A GMC Gas Pick-up with 600,000 miles on it, and it's just starting to Sputter a bit.
Amazing! but true.
G
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ekjdm14
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Posted: 14 hours 31 minutes ago at 10:46am |
Gary wrote:
WOW
A GMC Gas Pick-up with 600,000 miles on it, and it's just starting to Sputter a bit.
Amazing! but true.
G |
Well, to give the thing it's dues it is a 2000 model so a whole lot less complicated than more modern trucks. (not up on my American vehicles, would this be an LS or an old-skool SBC?) 600k though, that's impressive no matter what era it's from.
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Thad in AR.
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Posted: 13 hours 21 minutes ago at 11:56am |
ekjdm14 wrote:
Gary wrote:
WOW
A GMC Gas Pick-up with 600,000 miles on it, and it's just starting to Sputter a bit.
Amazing! but true.
G |
Well, to give the thing it's dues it is a 2000 model so a whole lot less complicated than more modern trucks. (not up on my American vehicles, would this be an LS or an old-skool SBC?) 600k though, that's impressive no matter what era it's from.
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LS 6.0
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Gerry D17
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Posted: 11 hours 34 minutes ago at 1:43pm |
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I bet you did regular oil changes. That's the only way to get high mileage out of engines.I have a 6.0 with 400,000 and change oil and filter every 3000 miles. Castrol GTX 5-30 and only WIX filters.Never added oil between oil changes. I hope you sort out your issue.
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