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#1 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,511
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Bought a rough running '04 Suburban
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I bought a 2004 Suburban with the 8.1 496ci engine and 4l80e, for parts. I decided to see if I could figure out the problem with it. Scanner said code PO 306 cylinder 6 misfire. Do you think maybe this would cause the problem???? 285,000 miles on it.. Should I fix it? .
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#2 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,138
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Re: Bought a rough running '04 Suburban
I say Yes.
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#3 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,393
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Re: Bought a rough running '04 Suburban
Yep. I love the 8.1. Torque for miles. They are one of the best truck engines GM ever built.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's |
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#4 |
Senior Member
![]() Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,343
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Re: Bought a rough running '04 Suburban
Little JB Weld, good to go.
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DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
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#5 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,266
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Re: Bought a rough running '04 Suburban
Absolutely, if only to see just how far it will go.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#6 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,708
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Re: Bought a rough running '04 Suburban
Might not be a bad idea to replace all of 'em while you're in there...
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#7 |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,721
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Re: Bought a rough running '04 Suburban
Oh wow, never seen a push rod go through the rocker arm.
Wonder if it got low on oil at some point. I bet that was a dead cylinder.
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1968 C10 327, 3 speed manual, LWB stock height daily driver. 1968 C20 327, 4 speed manual, LWB stock height custom camper with heavy duty leaf springs rear, 50th anniversary edition. Hoping to press into daily drive status soon. |
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#8 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,884
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early version of GM's AFM, cylinder deactivation the hard way.
we are getting ready to replace a 5.3 in a late model GMC with AFM that deactivated #7 permanently. ordered a Jasper engine that eliminates the AFM garbage AND is legal in the peoples republic of commifornia. throw a new rocker on yours and drive the wheels off it. ![]()
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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#9 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,499
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Re: Bought a rough running '04 Suburban
I would throw new rockers on it . I’ve seen pushrods go through ricers before but that one takes the cake . Never seen a rocker fracture like that
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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#10 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,708
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Re: Bought a rough running '04 Suburban
As a mechanic with 35 years experience, I've seen that many times.. I've seen pushrods with the tip broken off, split rockers, pushrods that wear a hole in the rocker, broken rocker arm studs,, I even saw a pushrod go through the valve cover when the rocker arm failed, all sorts of weird things...
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#11 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,117
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Re: Bought a rough running '04 Suburban
That's a wall hanger/conversation piece.....
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#12 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,650
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Re: Bought a rough running '04 Suburban
Wow..never seen one like that
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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#13 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,511
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Re: Bought a rough running '04 Suburban
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Thanks guys. I have an extra rocker and push rod I will put in it and see if there are any other problems before I change all of them. I am also going to insert my inspection camera down the push rod hole and see if I can see the lifter to make sure there aren't any problems with it. I am headed out to do that now. .
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#14 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,393
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Re: Bought a rough running '04 Suburban
This is from the 350 in my K20 a few years ago. It was an exhaust valve so it was backfiring thru the carb pretty bad and obviously had a nasty lifter tap. Slapped another used rocker in it with the pushrod from the picture and it’s been good ever since.
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's |
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#15 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,511
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Re: Bought a rough running '04 Suburban
Quote:
I hope I will be able to say the same.... ![]() I think I need to check the valve spring a little closer on that valve while I am in there too. .
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#16 |
10/30/19
Join Date: Aug 2004
Location: ottawa kansas
Posts: 5,215
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Re: Bought a rough running '04 Suburban
I don’t know if I’ve ever seen that scenario before but, I’m surprised that kind of thing doesn’t happen more often. There are a lot of moving parts under tension and extreme heat in an internal combustion engine.
I guess I’m stuck thinking about the old harleys that you had to tighten almost every nut at 400 miles intervals. ![]() Leon, I’m confident that if that engine is salvageable your the man for the job.
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Fight the good fight, finish the race, keep the faith |
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#17 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,549
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Re: Bought a rough running '04 Suburban
The consensus now-a-days is that either JB Weld or spray foam will fix anything so...............
but with that many miles on it I'd personally freshen up both the eng and trans |
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#18 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,266
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Re: Bought a rough running '04 Suburban
Flex seal. That's the ticket!
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__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#19 |
Senior Member
![]() Join Date: Sep 2018
Location: Belmont OH
Posts: 289
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Re: Bought a rough running '04 Suburban
Wow! .... Ive never seen anything like that before. You need to keep that for a conversation piece for sure!
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#20 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,138
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Re: Bought a rough running '04 Suburban
Here's what I see working with the Tool and Die industry for a while.
The Stamping Die that was producing these was, Either worn to the condition the punches and Dies needed replacing. Or the oil flow and air blow to clear the shavings and Scrap was not in Operation, In the picture I put arrows of things that should have been caught in the stamping process. With that being said it almost hit 300K. ![]()
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#21 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,511
|
Re: Bought a rough running '04 Suburban
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You guys crack me up.... ![]() I'm going to give it my best shot Scott. The center of the lifter is also missing in action I was able to get the lifter out without removing the intake. I will post a picture of it in the morning. .
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#22 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,337
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Re: Bought a rough running '04 Suburban
Oh shoot!!!
I wonder if a new lifter can be installed with head and intake still on? Next question, is what the cam lobe looks like.... |
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#23 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,511
|
Re: Bought a rough running '04 Suburban
Quote:
Got the old broken lifter out OK. Used my flex magnet to fish out the other pieces Looking down in the hole the cam looks OK. I am going back out shortly here, and check it with my inspection camera. .
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#24 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,650
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Re: Bought a rough running '04 Suburban
O wow..!!
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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#25 | |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,138
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Re: Bought a rough running '04 Suburban
Quote:
The pushrod beat up the snap ring. I am thinking where are the Ears of that snap ring? It probably won't make it back through they will drop to the bottom. Is the oil pan Metal? If so a magnet could be place in a position away from the oil pickup.
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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