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03-14-2018, 12:08 AM | #1 |
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Join Date: Jun 2017
Location: Hodge Louisiana
Posts: 13
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Carb backfire issues....I need some advice
On my 83 suburban 4x4 with a 350, I’m having light/medium throttle back firing issues, I’ve tried everything. Timing is at 12 degrees initial, 38 total I’ve got 18 inches of vacuum at idle float bowls are set right as best as I can tell, it’s a Holley 4160, I can’t figure this out it’s driving me nuts. What y’alls opinion??
Last edited by Cooter0003; 03-14-2018 at 12:09 AM. Reason: Typo |
03-14-2018, 09:27 AM | #2 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,733
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Re: Carb backfire issues....I need some advice
Could be the dreaded ‘flat cam’!
Pull one valve cover at a time and check all the rockers are moving the same. |
03-14-2018, 11:29 AM | #3 |
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Join Date: Jun 2017
Location: Hodge Louisiana
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Re: Carb backfire issues....I need some advice
I will on Friday when I can get new gaskets, the previous owner of this truck rtv’d the hell outta the gasket, but I put a buddies Edelbrock carb on it this morning, and so far no popping or backfires at all. It may have a bad cam the last owner wasn’t very kind to this truck at all
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03-14-2018, 12:17 PM | #4 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,733
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Re: Carb backfire issues....I need some advice
Drive it awhile before you pull the covers.
Might be a power valve or something plugged up in your Holley. Or a vacuum leak. Or the po did some mods to the Holley. |
03-14-2018, 01:58 PM | #5 |
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Join Date: Jun 2017
Location: Hodge Louisiana
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Re: Carb backfire issues....I need some advice
I think it is a cam, it popped once with the Edelbrock
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03-17-2018, 12:40 PM | #6 |
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Join Date: Mar 2010
Location: thomastown mississippi
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Re: Carb backfire issues....I need some advice
Pull your plugs & check the color. You COULD have a part throttle vacuum leak.
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03-17-2018, 09:02 PM | #7 |
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Join Date: Jul 2013
Location: fayetteville, nc
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Re: Carb backfire issues....I need some advice
I assume it's only popping back through the carb when it happens? I had something similar happen mainly out the exhaust pipe, checked cam and rockers, timing etc. Turned out to be fouled plugs. Sometimes it's the little things.
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03-18-2018, 01:01 PM | #8 |
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Join Date: Jun 2017
Location: Hodge Louisiana
Posts: 13
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Re: Carb backfire issues....I need some advice
Yea it only pops through the carb, and it has new accel plugs in it, and the color on them is light tan on the porcelain. Could a stretched timing chain cause the problem?
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