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Thad in AR. 
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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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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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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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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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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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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: 27 Sep 2024 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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Posted: 27 Sep 2024 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: 27 Sep 2024 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: 27 Sep 2024 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: 27 Sep 2024 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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Thad in AR.
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Posted: 09 Oct 2024 at 4:47pm |
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Took the truck in and had it scanned today. Mechanic says it’s fuel related. Checked the fuel pump and regulator and says it’s normal.
He thinks it’s injectors.
He priced me injectors for near $800.00
I found some at parts geek for $138.00
Would these cheap ones be a mistake? They had good reviews
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AllisFreak MN
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Posted: 09 Oct 2024 at 5:34pm |
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For a truck with 600,000 miles on it? I think I'd roll the dice on the cheap ones.
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'49 A-C WD, '51 A-C WD, '63 A-C D17 Series III, 1968 A-C One-Seventy, '82 A-C 6060, '75 A-C 7040, A-C #3 sickle mower, 2 A-C 701 wagons, '78 Gleaner M2
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steve(ill)
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Posted: 09 Oct 2024 at 10:21pm |
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i have used aftermarket injectors and coils with good luck..
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Like them all, but love the "B"s.
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Thad in AR.
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Posted: 10 Oct 2024 at 5:55am |
AllisFreak MN wrote:
For a truck with 600,000 miles on it? I think I'd roll the dice on the cheap ones. |
My thoughts exactly. The truck wouldn’t bring $800 if it had the new $ 800 injectors in it.
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desertjoe
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Posted: 11 Oct 2024 at 6:38am |
Thad in AR. wrote:
AllisFreak MN wrote:
For a truck with 600,000 miles on it? I think I'd roll the dice on the cheap ones. |
My thoughts exactly.
The truck wouldn’t bring $800 if it had the new $ 800 injectors in it.
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I don't know,,,I've rode "Shotgun" in Thad's trk before and it is very well kept and engine sounded great all those times,,,,,  I wouldn't hesitate on the aftermarket injectors,,,I've had good luck on using them lots of times. I've never tried SeaFoam and some say it works many Wonderfuls,,,,,,?
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