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#1 |
Registered User
![]() Join Date: Jan 2005
Location: Illinois
Posts: 1,006
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Engine backfiring
I just put the engine in my 71 anf it back fires once it is warmed up...any ideas???
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#2 |
Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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timing
__________________
1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's ![]() 1993 Cherokee work ride/weekend wheeler |
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#3 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Sounds to me like the carb idle is too lean if it runs ok while the choke is on and then it backfires when it's warmed up. try turning the idle screws out one turn each. The best way is to set them with a vacuum gage.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#4 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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Where do you guys hook your vacuum gauges up to????
I would go with the mixture screws aswell. 1 turn |
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#5 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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vacuum gage
http://www.classictruckshop.com/club...ts/vac/uum.htm You will need to have full manifold vacuum, so connect the gage where it reads manifold vacuum below the carb. Use this link for info.
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#6 | |
got boost?
Join Date: Mar 2005
Posts: 123
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Quote:
is it backfiring all the time? just when you step on the pedal?
__________________
'70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black" ![]() |
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