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09-27-2013, 07:11 PM
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#1 |
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Registered User
Join Date: Apr 2012
Location: Tempe, Arizona
Posts: 5
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New Crate 350 Misfire
Hey everyone,
I've just installed a new GM crate 350 on a '67 c10. Got her started today and it's idling faster at 15 deg BTDC; when it's at 5 deg BTDC it seems to misfire and backfire through the carb (even runs on when motor has been turned off...seems also to be running hot). Any ideas? Been a long day trying to sort this out. Thanks! |
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09-27-2013, 07:26 PM
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#2 |
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Kung Fu Master
 
Join Date: Oct 2005
Location: Montana
Posts: 543
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Re: New Crate 350 Misfire
Do you have the vacuum advance off and plugged when setting the timing? It will idle faster with more timing, you will just have to set the idle on your carb once you have the timing where you want it.
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72 GMC SuperCustom 4x4 1972 Chevrolet Cheyenne Super 4x4 |
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09-27-2013, 08:09 PM
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#3 |
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Registered User
Join Date: Apr 2012
Location: Tempe, Arizona
Posts: 5
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Re: New Crate 350 Misfire
No, the VA has been on. I'll give a try to setting the timing with it off and plugged and then adjust the carb.
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09-27-2013, 08:30 PM
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#4 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,228
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Re: New Crate 350 Misfire
you can;t set timming with the va hooked up set the timing at around 10-12 degrees stock is 8
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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09-27-2013, 11:22 PM
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#5 |
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The Older Generation
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,376
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Re: New Crate 350 Misfire
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Also make sure you don't have any vacuum leaks anywhere... LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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