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01-20-2011, 09:52 PM
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#1 |
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Registered User
Join Date: Jan 2008
Location: Soutwestern New Hampshire
Posts: 145
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1987 pops and bangs
my 87 GMC K2500, 350 engine runs good for a bit and then it starts popping, banging and farting thru the carb. I have had it at the local GM dealer ship and spent $856 so far and it still runs like Sh!!t. replaced the dis cap set the timing, checked what few sensors there are on it, checked vacuum hoses and routing and now I am lost. anyone got any ideas?
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2020 GMC Acadia Denali (Maroon) 2003 GMC 3500 4X4 Dually Dump (Red) 2007 KZ 41KG Toy Hauler (White with stripes) 2015 Harley FLHTCUTG Trike ( Maroon) 1995 Harley FLT (2 tone Red) 1992 Chevy S-10 4x4 Blazer (Dark Red) |
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01-21-2011, 12:16 AM
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#2 | |
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Registered User
Join Date: May 2010
Location: ambler, pa
Posts: 325
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Re: 1987 pops and bangs
Quote:
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Just would like the snow to stop so I can actually work on my truck!!!!!!!!!!! |
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01-21-2011, 08:58 AM
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#3 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: 1987 pops and bangs
Biker, GM had a problem with soft cams back then and was replacing them under warantee & mabey yours never got a new cam. I am surprised your local dealer couldn't fix it correctly. It's easy to check though. Put the truck in gear and throttle up. It should start poping back thru the carb right away. It will pop as if it is timed, just like if you removed a plug wire. It is not a random pop. If the truck is a stick you'll have to do it out on the street, but the symtoms will be the same pop,pop,pop,pop until you back off the gas. Let us know what you find. jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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01-21-2011, 12:14 PM
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#4 |
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Registered User
 
Join Date: Feb 2005
Location: Northeast--Bethlehem, Pennslyvania
Posts: 642
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Re: 1987 pops and bangs
Mine did the same. Found out the cam had a rounded lobe. It did not pop all the time at first then it popped right after I started driving it. engine is rebuilt now. NOW IT SMOKES, LONG STORY.
Big Blue
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Big Blue ( John ) 79 Chevy Pick up.....My Dailey STILL Working on a frame up: 1987 Truck body on a 78 Blazer frame. Need cab blasted to start project. Got the cab BLASTED, Now Prep and Paint. Started to lay SOME BONDO and primer. Done, Ordering paint. Got paint, Stuff painted,Cab,Fenders, Hood more later. 9/7/2015 Got the clear coat on,now time to take one off. Started to put things back (What a nightmare) like the heating and AC stuff,inside wire harness, outside AC unit and booster, still more. May 2016, still working on the inside. Got duck work in,heating and AC. Radio (stock) in dash with after market in console later, Speaker are hooked up, Steering column is in. Getting ready to drop the cab onto the frame, Working on engine now since I have the room. Well here it is 2018, got the engine in and it runs, now I need to get the exhaust system in so I can adjust the lifters, to loud right now. Got the exhaust on now I am waiting for the break parts to come in. |
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01-21-2011, 12:37 PM
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#5 |
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1965 Chevy C10, 2005 4.8L/4l60
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
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Re: 1987 pops and bangs
when did you get the dealer to work on it? under 3 months? if so take it back!
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Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684  support our troops! |
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01-21-2011, 01:47 PM
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#6 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: 1987 pops and bangs
Not that is makes difference with a flat cam.....but shouldn't an '87 have TBI, not a carburetor?
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You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. 
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01-23-2011, 06:34 AM
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#7 |
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Registered User
Join Date: Jan 2008
Location: Soutwestern New Hampshire
Posts: 145
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Re: 1987 pops and bangs
checking around I found a ground wire behind the engine that was loose on the engine as well as the firewall tightened both and the popping and banging went away. I was so happy I could again plow snow from my driveway I had at it and destroyed the inner axle shaft on the left side so back into the garage for repair. Thanks everyone for the help.
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2020 GMC Acadia Denali (Maroon) 2003 GMC 3500 4X4 Dually Dump (Red) 2007 KZ 41KG Toy Hauler (White with stripes) 2015 Harley FLHTCUTG Trike ( Maroon) 1995 Harley FLT (2 tone Red) 1992 Chevy S-10 4x4 Blazer (Dark Red) |
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01-23-2011, 10:06 AM
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#8 |
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GoatLube Experss
Join Date: Oct 2009
Location: clarksville, Tn.
Posts: 1,337
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Re: 1987 pops and bangs
mine had the same problem a while after I replaced the cam, turn'd out to be the same thing. the ground wire on the back of the block.
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Goat Lube Express, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's) |
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