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What does a misfire sound like?
04-18-2005, 07:43 PM
Post: #1
 
Obviously you know a backfire when you hear one, but what does a misfire sound like? Can a fouled plug cause a misfire? What does a fouled plug look like?




93 Chevy 1500<BR>6 inch pro-comp lift<BR>3 inch body lift<BR>16/35x15 TSL Boggers<BR>355 TBI w/Vortec heads<BR>Headman Headers<BR>Detroit Locker in the rear<BR><BR>2003 GMC 2500HD<BR>8100 Big Block<BR>STOCK!<BR><BR>http://www.4wheelcustoms.com
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04-18-2005, 08:35 PM
Post: #2
 
The motor will have a vibration to it depending on how bad, it shouuld throw a misfire code, fouled plug will be covered in oil or white crap depends on whats going wrong.




02 TJ couple things done to it<BR>72powerwagon couplethings done to it<BR>03 1/2 ton hemi couple thngs done to it
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04-18-2005, 09:08 PM
Post: #3
 
His truck might not throw a misfire code though. Also, cracked wires can cause a misfire too.




Chad<BR>03 Dodge Ram 3500 SRW, auto, SO motor, 4.10 gears, crew cab/shortbed, black.<BR>\"We Aint the Baddest-Bad Don\'t Mess With Us\"-Grave Digger
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04-18-2005, 09:12 PM
Post: #4
 
If you don't know what a misfire sounds like just turn your truck on, open your drivers door, put the truck in drive, put your foot on the brake, hit the gas and our drivers door should be vibrating like all hell (make sure it is still open). I'm sure you can find lots of pics of fouled out plugs on the Internet. If you haven't changed them in the last 30k, I would say it is worth doing anyway.




2004.5 Ram 2500 Cummins 600 SLT 4x4, Isspro Boost/EGT/Tranny temp gauge setup, EDGE EZ, AFE Pro Guard 7, Torque Tube<BR><BR>85 4 Runner lifted with 33x14.50 SSR\'s for now...
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04-18-2005, 10:55 PM
Post: #5
 
My new motor when i got it had a bad missfire for some reason.i was about to kill the guys that work at the shop who dropped in my new motor in my truck...literally..... Cuss Cuss , easy fix had a cracked spark plug...replaced it motor ran like a champ ever since.....if u have a miss fire trust me you will know because the motor will run like it ain't fireing on all 8.




1978 Chevy K-10..8 inch all spring BDS lift+ 3 inch body lift,ORD lift Shackles,BDS Shocks, Pro-Comp steel brake lines, 38x14.5 TSL/SX , NEW 350 SB .30 over, Accel Ignition,Headmen Headers,2.02 Heads, roller tipped rockers, Flowmaster mufflers, 350 tranny, np 205, dana44, 14 bolt full floater with disk brake conersion!!, pioneer deck, 6 1/2 pioneers in doors, 6x9\'s pioneer 4 ways in cab corners, 1500 watt Rocker Fosgate amp, 12 inch Sony Xplode sub,future plans Dana 60 and 44\'s hopefully i
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04-19-2005, 07:39 AM
Post: #6
 
I still don't understand what a misfire sounds like. If I powerbreak it with the door open I'll hear tires burning. Not rattling. I yanked a plug and it looks like its got a good deal of carbon on it, not wet with oil at all. The white part isn't white anymore, completely covered with carbon. Would this indicate a fouled plug?




93 Chevy 1500<BR>6 inch pro-comp lift<BR>3 inch body lift<BR>16/35x15 TSL Boggers<BR>355 TBI w/Vortec heads<BR>Headman Headers<BR>Detroit Locker in the rear<BR><BR>2003 GMC 2500HD<BR>8100 Big Block<BR>STOCK!<BR><BR>http://www.4wheelcustoms.com
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04-19-2005, 11:56 AM
Post: #7
 
a miss fire won't sound liek anything....on my truck just when u would rev the motor it acted like it was missing a beat....u say the plug was all carboned up....go ahead and replace um and see what happens can't hurt.




1978 Chevy K-10..8 inch all spring BDS lift+ 3 inch body lift,ORD lift Shackles,BDS Shocks, Pro-Comp steel brake lines, 38x14.5 TSL/SX , NEW 350 SB .30 over, Accel Ignition,Headmen Headers,2.02 Heads, roller tipped rockers, Flowmaster mufflers, 350 tranny, np 205, dana44, 14 bolt full floater with disk brake conersion!!, pioneer deck, 6 1/2 pioneers in doors, 6x9\'s pioneer 4 ways in cab corners, 1500 watt Rocker Fosgate amp, 12 inch Sony Xplode sub,future plans Dana 60 and 44\'s hopefully i
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04-19-2005, 05:41 PM
Post: #8
 
I'm not saying to powerbrake it. I'm saying put the motor under a load and then you should be able to see the door about to shake off or be able to hear the miss in the engine.




2004.5 Ram 2500 Cummins 600 SLT 4x4, Isspro Boost/EGT/Tranny temp gauge setup, EDGE EZ, AFE Pro Guard 7, Torque Tube<BR><BR>85 4 Runner lifted with 33x14.50 SSR\'s for now...
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09-21-2005, 05:04 PM
Post: #9
 
Still lost on this one as well. When I'm driving it I can hear it missing a beat or two, or three. Kind of like Doo Dooo Dooooo Do Do Doooo.

Thats what it sounds like.




93 Chevy 1500<BR>6 inch pro-comp lift<BR>3 inch body lift<BR>16/35x15 TSL Boggers<BR>355 TBI w/Vortec heads<BR>Headman Headers<BR>Detroit Locker in the rear<BR><BR>2003 GMC 2500HD<BR>8100 Big Block<BR>STOCK!<BR><BR>http://www.4wheelcustoms.com
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09-24-2005, 11:49 PM
Post: #10
 
sounds right to me....u have headers???? grab each one of the header pipes by the head....if a cyclinder ain't fireing the pipe will be cold...if hot and burning fine the pipe should smoke your finger...LOL have fun....trust me it will work.....your'll know if all 8 are firing.




1978 Chevy K-10..8 inch all spring BDS lift+ 3 inch body lift,ORD lift Shackles,BDS Shocks, Pro-Comp steel brake lines, 38x14.5 TSL/SX , NEW 350 SB .30 over, Accel Ignition,Headmen Headers,2.02 Heads, roller tipped rockers, Flowmaster mufflers, 350 tranny, np 205, dana44, 14 bolt full floater with disk brake conersion!!, pioneer deck, 6 1/2 pioneers in doors, 6x9\'s pioneer 4 ways in cab corners, 1500 watt Rocker Fosgate amp, 12 inch Sony Xplode sub,future plans Dana 60 and 44\'s hopefully i
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