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07-24-2002, 08:09 AM
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#1 |
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Registered User
Join Date: Apr 2000
Posts: 26
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350 Not Running Right
Question for the experts: I have a 350 in my '69 C-10 and it is currently having a 'session' where it will not seem to run properly. The truck has picked up approx. 200 rpm at idle, seems to run rich (black smoke) and when getting on the pedal to put engine under load, acts like it is only running on 4-6 cylinders (sounds very flat & has no power at all). I have checked the wires to be sure that they were not arcing against the manifold & HEI unit seems to be tight, such that the timing hasn't changed. Problem surfaced after a spirited run at 70-75 mph, which wound the motor at 3500-3700 rpm for approx 5 minutes. Carb is an Edelbrock on top of Edelbrock RPM Performer Manifold. Ignition module was replaced 7/01. Any help would be appreciated
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07-24-2002, 08:44 AM
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#2 |
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Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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My guess is that you threw a rocker or two. Take the valve covers off and see.
Ben |
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07-24-2002, 08:44 PM
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#3 |
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Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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Black smoke tells me it's running rich and/or flooding. I would remove carb and tear it down, inspecting for particles of crap in bowls and at needle and seat area, also condition and adjustment of floats. If you don't tear up any gaskets, all you may need is a good cleaning and reassemble.
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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07-24-2002, 09:39 PM
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#4 |
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Got big-block?
 
Join Date: Jul 2000
Location: Austin, Texas
Posts: 2,453
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Yeah, sounds way rich. Check that carb like Gordo said.
SC
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'68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396 |
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07-24-2002, 09:41 PM
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#5 |
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Registered User
Join Date: Feb 2000
Location: Brandon, SD, USA
Posts: 1,292
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what kind of carb? my quadrajets choke would just close sometimes and do that. sometimes when it was hot, sometimes when it was cold. did the same thing you describe. good luck, Ben
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Brandon, SD 69 GMC 1/2 ton 2wd wide long bed with wood 3 on the tree 350 engine 4 bolt main rv cam AIM = Alphray04 |
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