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06-27-2003, 03:35 PM
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#1 |
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Registered User
Join Date: Jan 2003
Location: Mesa, Arizona
Posts: 125
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Help - Carb Backfire
I was driving to work today and started hearing/feeling carb backfires. I got nervous and exited the highway, and it seemed to drive OK. When I re-entered the highway, it started again... at about 55-60 MPH.
My question: What would cause a carb backfire at 55+ MPH, but otherwise it runs fine? I have to wonder if the outside temp (about 105) is contributing - I've not driven the truck in such hot weather since rebuilding the engine and installing the new carb. Any ideas? Thanks!
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Paul 72 Cheyenne Super Custom Camper greenaz@hotmail.com |
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06-27-2003, 04:20 PM
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#2 |
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Young Gun wth Fast Inline
Join Date: Jan 2002
Location: Idaho
Posts: 1,475
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fuel to hot? you sure its back firing or is it just like quiting. Could be vaporlock
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!! |
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06-27-2003, 04:33 PM
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#3 |
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Registered User
Join Date: May 2000
Location: Victoria, BC, Canada
Posts: 2,410
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Have a looksee inside your dist. cap.
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1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. |
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06-27-2003, 04:40 PM
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#4 | |
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Registered User
Join Date: Jan 2003
Location: Mesa, Arizona
Posts: 125
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Quote:
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Paul 72 Cheyenne Super Custom Camper greenaz@hotmail.com |
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06-27-2003, 05:01 PM
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#5 |
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Registered User
Join Date: Sep 2001
Location: central Ill. USA
Posts: 447
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Does kinda sound like fuel vaporization. I read somewhere the Edel. carbs need a heat insulator when things get hot, weather and engine, cause the fuel can boil in the bowls. Carbs like Holleys have the bowls hung on the outside but Edel/Carters have the bowls right on top of the hot engine. Dang! 105!
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69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint ______________________________ |
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06-27-2003, 05:15 PM
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#6 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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You sure it's not running out of gas?
A clogged fuel filter will give you problems like that. I would go ahead and try it....a new filter is about $3 and takes 10 minutes to put in.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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06-27-2003, 08:27 PM
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#7 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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also check the air filter i hadnt cleaned my foam filter in who knows how long and everytime i got to about 60 mph it would start hesitating realllllllllll bad on the highway stay under 60 and it was fine
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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06-27-2003, 10:58 PM
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#8 |
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I finally got an avatar
Join Date: Jan 2003
Location: Cheney, WA
Posts: 180
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Mine used to do that in the summer until I put the plastic spacer under the carb. That's with an Edelbrock 1407. I agree to check under the dist cap though, it could be carbon tracked and cross firing.
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-72 C-10 short step (straight line only) 12.922/102.28 -69 C-20 on Propane (DD) -69 C-10 -56 Mack B-753LS (tow rig) -94 Chev K2500 Short Ex-Cab -89 Isuzu Trooper...Kinda -03 Kawasaki KFX-400 -05 Suzuki DRZ-400S |
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