HELP I HAVE A BACKFIRE

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Feb 26, 2015 | 06:17 PM

OrangeRanger

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HELP I HAVE A BACKFIRE

Hi everyone I don't post much on here, but my 74 f100 has had only one issue since i have had it. Its my daily driver and i don't have anything else wrong with it mechanically, but it likes to backfire when i want to hit the gas real hard. I narrowed it down to either timing belt, or maybe I need a tune up and new spark plugs. Any thoughts?

Feb 26, 2015 | 07:32 PM

gatorfor88

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From: Panama City

Well I promise it doesnt need a new timing belt.

Feb 26, 2015 | 07:40 PM

75PKUP

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Backfire through exhaust or carb?

Feb 26, 2015 | 07:43 PM

75PKUP

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Backfire through exhaust or carb?
You are mean gatorfor88! LOL

Feb 27, 2015 | 11:40 AM

dentsides

Mountain Pass

Joined: Mar 2014

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From: NM

I agree the timing belt probably isn't the issue. The carb, exhaust, and vacuums can be.

Feb 27, 2015 | 11:52 AM

bkaul

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Joined: Aug 2010

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From: Knoxville, TN

Quote:

Originally Posted by dentsides

I agree the timing belt probably isn't the issue.

Given that these use timing chains, not belts, I'll go with gator and say I'm sure of that!

Feb 27, 2015 | 01:39 PM

75PKUP

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A backfire can usually be attributed to either timing or too lean

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Mar 1, 2015 | 07:42 PM

OrangeRanger

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Yes it is through the exhaust when i wana get and go real quick so you guys think it might be the vacuum?

Mar 1, 2015 | 07:47 PM

#10

OrangeRanger

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Quote:

Originally Posted by gatorfor88

Well I promise it doesnt need a new timing belt.

Yeah i didn't catch that my bad i think we all have our moments when we forget we are talking classics

Oct 8, 2015 | 10:32 PM

#11

GPGarrison

New User

Joined: Jun 2014

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From: Foster

If your still having that backfire, I narrowed my months-long backfire down to the carb float, just barely out of adjustment.

Oct 9, 2015 | 02:18 AM

#12

Willz74

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Joined: Jul 2015

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I just went and put a 454 into a friends truck and let them do the tuning it back fired every time they stomped the gas I suspected the very loud ticking noise until I realized they had been timing the motor to ~8 degrees and leaving the vacuum advance connected they retimed it still had the ticking still made an odd noise when you hit the clutch still slower than my f250 with a camper (not a shell) on it but no backfire

Oct 9, 2015 | 06:31 AM

#13

gatorfor88

Postmaster

Joined: Jan 2013

Posts: 3,512

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From: Panama City

Punctuation.Is.Your.Friend.Please.Use.It. It.Makes.It.So.Much.Easier.To.Read.And.Comprehend.
That.Is.All.
Thank.You.

Oct 9, 2015 | 12:49 PM

#14

twise

Senior User

Joined: Jun 2007

Posts: 394

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From: Springfield, Il

If your running a points system I would try changing the condenser. My 73 390 had an issue with back firing out of the exhaust. I changed the $5 condenser and has been perfect since then. If your not sure what it is take the distributor cap off, it looks like a AA battery. Very inexpensive and very easy to change.