back firing problem!

87prjctpony · 08-25-2005, 05:44 PM

my 87 sounds like its backfiring when i sometimes stomp on it all of a sudden. it feels like a loss of power for that second. ive changed wires and plugs. my car runs good just until i stomp on it in low end range. what can it be? sometimes im thinking its coming from the engine ? inside the oil pan or somewhere. any suggestions???

Ieatcamaros · 08-26-2005, 01:16 PM

Check your timing and post the results.

Quote:

sometimes im thinking its coming from the engine ? inside the oil pan or somewhere.

Could you explain this in a little more detail?

87prjctpony · 08-27-2005, 02:55 AM

well it sounds like a pop from inside the oil pan. its pretty hard to explain. i dont think its the timing because my car idles fine. it only does it like once a day. do you guys think it might be my exhuast that isnt sealed right somewhere??

GhettoPop · 08-29-2005, 11:50 AM

as Ieatcamaros said, check timing and post results.

PKRWUD · 08-30-2005, 05:24 PM

Okay, I'll go out on a limb here and say you have a loose collector bolt. This will cause a slight exhaust leak, but when you back off the throttle suddenly, after punching it, it will create a small "backfire" because the sudden vacuum draws oxygen rich air into the red hot exhaust, and causes it to ignite. Very common problem when a header collector bolt is loose, or the gasket is damaged.

08-25-2005, 05:44 PM	#1
87prjctpony 87prjctpony Join Date: Aug 2005 Location: seaside ca Posts: 57	back firing problem! my 87 sounds like its backfiring when i sometimes stomp on it all of a sudden. it feels like a loss of power for that second. ive changed wires and plugs. my car runs good just until i stomp on it in low end range. what can it be? sometimes im thinking its coming from the engine ? inside the oil pan or somewhere. any suggestions??? __________________ i have a 87 5.0 gt with mac shorty headers, off-road h-pipe, mac mufflers, transgo shift kit, msd blaster coil, and 3.73 gears. o yeah aod tranny.

08-27-2005, 02:55 AM	#3
87prjctpony 87prjctpony Join Date: Aug 2005 Location: seaside ca Posts: 57	Re: back firing problem! well it sounds like a pop from inside the oil pan. its pretty hard to explain. i dont think its the timing because my car idles fine. it only does it like once a day. do you guys think it might be my exhuast that isnt sealed right somewhere?? __________________ i have a 87 5.0 gt with mac shorty headers, off-road h-pipe, mac mufflers, transgo shift kit, msd blaster coil, and 3.73 gears. o yeah aod tranny.

08-29-2005, 11:50 AM	#4
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	Re: back firing problem! as Ieatcamaros said, check timing and post results. __________________ 1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong!

08-30-2005, 05:24 PM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Re: back firing problem! Okay, I'll go out on a limb here and say you have a loose collector bolt. This will cause a slight exhaust leak, but when you back off the throttle suddenly, after punching it, it will create a small "backfire" because the sudden vacuum draws oxygen rich air into the red hot exhaust, and causes it to ignite. Very common problem when a header collector bolt is loose, or the gasket is damaged. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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