Chevy 350 Missing and Back firing through carb

Chevy Forum Chevy Classifieds Photo Gallery Chevrolet News Search Contact CF Sponsors
Member List Forum FAQ Chevy Timeslips Chevy Recalls TSBs Calendars Register Login

Chevy 350 Missing and Back firing through carb

Printable Version

Chevrolet >> General Chevrolet Forums >> General Tech >> Chevy 350 Missing and Back firing through carb

Page: [1]

Message

<< Older Topic Newer Topic >>

Chevy 350 Missing and Back firing through carb - 11/26/2007 10:22:11 PM

grem62483

Posts: 5
Joined: 11/25/2007
Status: offline

The motor runs just fine at Idle but when I give it a little gas she misses and backfires through the exhaust and the carb. Its a 350 with a Holley carb. The guy I bought the boat from said that the motor was just rebuilt and that it doesn't even have 30 hrs on it. (AIR BOAT). If I gradually press the throttle to the floor it will sometimes miss and then rev way up. (Not all the time but some)Does anybody have any suggestions on what could be causing this to happen? Just want to get this thing running perfect before I take it out in the marsh. I don't want to get stuck where nobody can reach me. lol Thanks

Post #: 1

RE: Chevy 350 Missing and Back firing through carb - 11/27/2007 5:01:21 AM

astroDZak

Posts: 84
Joined: 9/2/2007
Status: offline

Possible cracked or wet distributor cap also could be plug wires leaking and cross firing. If it has a points type distributor it could be in the points.
Backfire through the intake and exhaust both eliminates the possibility of a flat lobe on the camshaft.
I would check the tune up first then you might add a little marvel mystery oil into the fuel and engine oil incase its a problem of valves sticking.
If you do have a points style distributor I would be changing it out to electronic asap even if its a mallory or axcell dual point.

(in reply to grem62483)

Post #: 2

RE: Chevy 350 Missing and Back firing through carb - 11/28/2007 4:50:22 AM

FlapJack

Posts: 13
Joined: 11/20/2007
Status: offline

Check the timing...

(in reply to astroDZak)

Post #: 3

RE: Chevy 350 Missing and Back firing through carb - 11/29/2007 10:02:09 AM

MalibuMaxxSS

Posts: 629
Joined: 11/18/2006
Status: offline

^^ second that.....

_____________________________

2006 Malibu Maxx SS, computer Flashed, undercar LED, Cold air intake, 18' Potenzas, Limo tint front to back

1990 YJ Lifted Locked and always muddy, posi loc, 33s TSLs, weber carb. drop tailgate...

(in reply to FlapJack)

Post #: 4