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03-11-2008, 03:13 AM
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#1 |
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Registered User
Join Date: Oct 2007
Location: Stockton, Ca
Posts: 128
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Is Backfire Necessarily Bad?
I searched some threads, and didnt find anything about my particular "problem".
I just want to know if its necessarily a bad thing, my truck backfires when i rev it out(in park or neutral, not while in drive and smashing the gas) and usually its a few "Pop pop pops". i dont believe its my engine, but i only hear it below me and no from the engine area. i actually kind of like that Mean hoarse sound that the backfire makes. but could it be excess gas burning in the exhaust? or mabye oil or something. plus everytime i start up my truck, it shoots out a decent amount of smoke(not really thick) but its white. figured some of you guys could give me a heads up. im going to get a video of my exhaust hopefully so i can post it on here. thanks again. |
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03-11-2008, 06:18 AM
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#2 |
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Well, Whoop-dee-do!
 
Join Date: Mar 2003
Location: Easton, Mo. pop.- me & scarcely a few others
Posts: 2,302
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Re: Is Backfire Necessarily Bad?
If it is a fast crackling popping sound out the exhaust- you probably have too much timing advance at high rpm. I've seen some low compression engines that are more responsive under load when set like this- but in general- not good. Detonation from too much advance under load can break piston ring lands. Sometimes you won't even hear it pinging.
__________________
'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD  '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car 
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03-11-2008, 11:30 AM
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#3 |
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Senior Member
Join Date: Mar 2007
Location: VANCOUVER ISLAND, B.C., Canada
Posts: 1,602
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Re: Is Backfire Necessarily Bad?
Not a good thing in the long run.
esll. 
__________________
Tomorrow is for doing today's stuff.  ************************************* This truck has just the right amount of energy for me! Author: Warren Lake .... (member) |
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03-11-2008, 12:03 PM
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#4 | |
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Gone to greener pastures
Join Date: May 2007
Location: Gateway to the Delta
Posts: 7,354
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Re: Is Backfire Necessarily Bad?
Quote:
What a great way to make a point!
__________________
'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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03-11-2008, 06:00 PM
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#5 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Is Backfire Necessarily Bad?
Quote:
Usually, or most commonly, a popping sound in the exhaust is unburned fuel. But in this case you should check a few things. You could have a combination of problems??? The first thing I'd do is a compression/leak check to make sure your white smoke is not water seeping into your cylinders and or bad valves. If the white smoke shows up after you run it for a while, then it could just be condensation evaporating when the exhaust gets hot... Then I'd make sure the carb isn't running too rich (dark gray to black smoke). Next I'd check and/or replace all ignition components. Plug wires, plugs, distributor cap and rotor, etc... Last edited by 68gmsee; 03-11-2008 at 06:02 PM. |
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03-11-2008, 06:02 PM
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#6 |
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Registered User
Join Date: Jan 2008
Location: austin texas
Posts: 202
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Re: Is Backfire Necessarily Bad?
exploded muffler........I would say someone had a little unburned fuel. That is the worst I have ever seen.
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Mike 68 C10 LWB midnight blue metallic 307ci, 700R4, HEI front discs, leaf spring rear tilt steering wheel, stock ride height, rally wheels, 2007 Dodge Charger(Hemi) |
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03-11-2008, 09:36 PM
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#7 | |
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Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
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Re: Is Backfire Necessarily Bad?
Quote:
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03-11-2008, 09:59 PM
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#8 |
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Registered User
Join Date: Oct 2007
Location: Stockton, Ca
Posts: 128
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Re: Is Backfire Necessarily Bad?
ESLL: i bet that was a fun sound to hear haha. i am going to be checking into a few things today
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03-12-2008, 02:26 AM
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#9 | |
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Senior Member
Join Date: Mar 2007
Location: VANCOUVER ISLAND, B.C., Canada
Posts: 1,602
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Re: Is Backfire Necessarily Bad?
Quote:
I thought you would like that. esll.
__________________
Tomorrow is for doing today's stuff. ************************************* This truck has just the right amount of energy for me! Author: Warren Lake .... (member) |
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03-12-2008, 02:34 AM
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#10 |
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Registered User
Join Date: Oct 2002
Location: West Des Moines, Ia
Posts: 3,233
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Re: Is Backfire Necessarily Bad?
well what if mine shot flames out the pipes when i would let off the throttle on the highway
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Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO |
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