popping under load...real loud

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Jul 14, 2003 | 11:17 PM

black84-6spdz28

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From: green bay

popping under load...real loud

for some odd reason this holley 750vs started popping, then stumbling under load from 1500 then smooth out and pop more at 3000rpms...what the hell?...idles a lil weird and is running rich....power valve?

Jul 14, 2003 | 11:43 PM

CamaroX84

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From: Michigan

The popping is a backfire. Does it sound like it is coming from the engine (carburetor) or the exhaust?

Jul 15, 2003 | 01:42 AM

black84-6spdz28

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From: green bay

it sounds like the exhaust but some times it sounds like its from the engine

Jul 17, 2003 | 01:17 AM

black84-6spdz28

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From: green bay

i got it figured out...thanks for the help

Jul 17, 2003 | 04:59 AM

1FastZ

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Joined: Jul 2001

Posts: 667

Likes: 2

From: Louisville Kentucky U.S.A.

Car: 86 Iroc Z

Engine: 406

Transmission: 350 Turbo

Axle/Gears: 373

What was it?

Jul 21, 2003 | 04:01 PM

1FastZ

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Joined: Jul 2001

Posts: 667

Likes: 2

From: Louisville Kentucky U.S.A.

Car: 86 Iroc Z

Engine: 406

Transmission: 350 Turbo

Axle/Gears: 373

anyone know what he found out about his problem?
Mine is doing the same thing

Jul 21, 2003 | 05:46 PM

Fbird88

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Joined: Jan 2001

Posts: 319

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From: Jacksonville, FL, USA

Car: 1988 Firebird

Engine: GM Performance Parts 350 HO

Transmission: T56

Axle/Gears: :(

Mine did that and it turned out my Dad put in 87 octane. Put in 93 and it went away. Also it could be that the timing is too far advanced.

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