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Yesterday, 09:33 PM
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#1 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,505
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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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Yesterday, 10:01 PM
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#2 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 8,129
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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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Yesterday, 10:45 PM
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#3 |
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All about them K’s
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,387
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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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Yesterday, 11:04 PM
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#4 |
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Senior Member
Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,342
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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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Yesterday, 11:30 PM
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#5 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,261
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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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Today, 01:33 AM
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#6 |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,705
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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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Today, 01:45 AM
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#7 |
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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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Today, 10:12 AM
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#8 |
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Born Psycho
Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,883
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Re: Bought a rough running '04 Suburban
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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Today, 10:41 AM
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#9 |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,497
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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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Today, 10:50 AM
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#10 |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,705
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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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Today, 11:12 AM
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#11 |
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Proprietor of Dale's Corner
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,113
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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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Today, 11:14 AM
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#12 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,647
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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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Today, 11:27 AM
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#13 |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,505
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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. .
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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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Today, 11:27 AM
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#14 |
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All about them K’s
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,387
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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.
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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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Today, 11:31 AM
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#15 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,505
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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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