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08-25-2005, 05:44 PM | #1 |
87prjctpony
Join Date: Aug 2005
Location: seaside ca
Posts: 57
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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???
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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. |
08-26-2005, 01:16 PM | #2 | |
Domestic Rice really sucks!
Join Date: Apr 2002
Location: KY
Posts: 973
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Re: back firing problem!
Check your timing and post the results.
Quote:
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08-27-2005, 02:55 AM | #3 |
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??
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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 |
Gimme a Drink!
Join Date: Dec 2002
Location: NYC
Posts: 694
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Re: back firing problem!
as Ieatcamaros said, check timing and post results.
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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 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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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.
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