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#1 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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weired issue
This morning get in my truck drive about 3 miles stop at store when I stop in gear truck can not even hold idle drops to like 150rpm stumble starts to die shift into park goes up to about 500rpm still really ruff. Shut it down look underhood no lines off or plugs unpluged. Go into store come out press gas to floor to make sure choke is set good fire it up runs great all the way to work. run it up to about 3000rpm a few times all good idles smooth as silk. Now to the weather about 39 foggy and misty rained last night, really humid. could this just be a choke issue maybe did not set good or came out to soon?
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#2 |
A.K.A- Crummy
Join Date: Jun 2005
Location: NC foothills
Posts: 3,025
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Re: weired issue
Could be a change in climate issue. I used to reset my quad every change in season.
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2003 Silverado Z71 Are fishermen all liars? |
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#3 |
Jamie Hyneman is my twin
![]() Join Date: Nov 2005
Location: La Junta, Colorado
Posts: 705
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Re: weired issue
quadrajet primaries can get stuck inside the body when they experience climate change. When the engine is off for a while, the temperatures even out, and things return to normal. Carb starts back up in "hot start". Happens occasionslly to me.
hope your day gets better.
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Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis |
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#4 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: weired issue
running a holley should have stated that.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#5 | |
A.K.A- Crummy
Join Date: Jun 2005
Location: NC foothills
Posts: 3,025
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Re: weired issue
Quote:
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2003 Silverado Z71 Are fishermen all liars? |
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#6 |
Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: weired issue
sounded like vapor lock to me.
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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#7 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: weired issue
Carb. Icing--right temp and right humidity =frost buildup on carb blocking idle air bleeds-dies -heat from engine melts frost-starts and run fine. You now know why the hot air tube to air cleaner is for.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#8 |
It's a catastrophic success.
![]() Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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Re: weired issue
With the high humidity you may have plug wires hopping a spark. One good way to tell is start it cold in the dark, it will look like the 4th of july.
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#9 | |
Senior Member
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Location: Estherville, Iowa
Posts: 3,371
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Re: weired issue
Quote:
Yep - Carb icing, I'll bet money on it. As the gas vaporizes in the carb, it cools it down below freezing, with high humidty and temps in the 30's the carb will ice when conditions are right. My holley does that to. Add a carb air heat tube, or what I do is run gasahol 10 percent blend in the winter. The alcohol seems to keep it from icing. When the air is colder and drier, icing isn't near as likely to happen. Temps in the 20's and 30's and humid makes mine ice up.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#10 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: weired issue
Quote:
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#11 |
On the college boy budget...
Join Date: Oct 2005
Location: Athens, Georgia
Posts: 370
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Re: weired issue
Same thing happened to me with my Edelbrock on the way to school one mornin, pretty much the exact same conditions. It finally died in the parkin lot but I cranked it and revved it a little and all was fine, hasn't done it since, figured it was just the cold.
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-'68 C10 short/step- 350/350 |
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#12 |
On the college boy budget...
Join Date: Oct 2005
Location: Athens, Georgia
Posts: 370
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Re: weired issue
And we're supposed to be gettin freezin rain here tonight, should make things interestin in the mornin. I hate winter...
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-'68 C10 short/step- 350/350 |
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