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06-12-2004, 12:21 PM
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#1 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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350 running like $hit
i just rebuilt the quadrajet 4bbl carb on my pickup, bolted it on, and dropped the battery in and cranked it up and it runs like crap. when i really open it up it runs great, it just won't idle smooth. before i rebuilt the carb, the engine ran smooth, it just didn't accellerate good. what's up with this???
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck Last edited by Robert1970C20rstbukt; 06-12-2004 at 12:25 PM. |
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06-12-2004, 03:33 PM
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#2 |
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Registered User
Join Date: Jul 2000
Location: Chandler, Arizona, USA
Posts: 299
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Possible vacume leak?
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-1968 Chevy SWB = Frame Off/383/Muncie Car 4 speed -1968 Chevy SWB = numbers matching 307/Truck 4 speed. -1966 Chevy II = 2 door No Post/130,000 Orig miles/230 6cyl/powerglide/Vintage AC -1972 Chevy Nova = 2 door/412 Small Block -1927 Ford Roadster = Homebuilt/widened 8"/350/ Custom Everything. |
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06-12-2004, 05:11 PM
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#3 |
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My son, my joy.
Join Date: Sep 2003
Location: Spokane WA
Posts: 463
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Sounds like you need to adjust the idle mixture.
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06-12-2004, 06:12 PM
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#4 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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BTW Welcome to the board from South Mississippi. That's a heck of a screen name you got there!
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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06-12-2004, 09:17 PM
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#5 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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Thanks guys, will check that out tomorrow morning. Yeah, I did pick a long name. My name's Robert, my truck is a 1970C/20, and it is a rust bucket. It needs new rockers and a left cab corner, and probably 5 gallons of bondo.
 It's a Texas farm truck that my Grandfather bought in '78, then my Dad bought him an '83 1/2 ton Silverado in '96 that he still has, so the old 70 was put out in the field and sat idle till last year when I started working on it. I'll try to get some pics of my truck, it's definetly a work-in-progress rig. Right now it's got bondo and primer all over it. 
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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06-12-2004, 09:26 PM
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#6 |
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huh?
 
Join Date: May 2000
Location: Washington, Illinois
Posts: 5,692
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Sounds to me like a major vacuum leak. Be sure you didn't knock off the vacuum modulator line at the back of the intake, and make sure the carb is sealed well against the intake. I had the exact same problem with a 78 F100 that I was working on....the carb base gasket didn't seal well to the intake, so it wouldn't idle, but it'd run fine when I was on the gas. I replaced the base gasket, snugged down the carb, and it ran perfect after that.
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Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay |
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06-12-2004, 09:31 PM
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#7 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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OK, thanks. I'll check that too. I replaced every hose in the engine compartment so it's either a mixture problem or a leak like you said.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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