Loud backfires??

blueneonman1 · 05-03-2001, 09:05 PM

In my GT, when I am going over 50mph and drop it down into 2nd to let the rpms rev in a downshift, my car will almost always backfire. Sometimes it does one loud BANG! and sounds like a sawed-off shotgun and other times it just gurgles till the rpms drop. I must admit, I love the shotgun sound and how it makes joggers take a double-step when I do it next to them, but I want to know why it does this and if it is bad. Some people tell me it's timing and that my timing is too retarded. Is this correct or is there some other reason? I have 73,000 miles on my car and have never changed the fuel filter. I'm wondering if that is the problem because it never backfired 20,000 miles ago, with my old engine. Then at around 50,000 miles it started. I got a new engine in at 65,000 miles and it backfired on that from day 1. So what is making these backfires?

------------------
Blueneonman - '95 5.0L Mustang GT Convertible | K&N Drop-in | FMS 9mm Wires | Hollow Cats | Flowmaster 2 Chambers | Subframes | 6-pt Rollcage | 14deg Timing | King Cobra Clutch | FMS Adjustable Clutch Cable | Coolest Neon Lighting on a Mustang EVER!

Best time: 14.8 @94mph

les1 · 05-03-2001, 11:32 PM

timing is one of the only thing that can do that set it to 10 and dont forget to unplug the computers timing compensator.also if you can floor it and it runs good your filter is fine

TEXSN95 · 05-04-2001, 01:12 AM

You should have changed your fuel filter about 50,000 miles ago. A clogged filter can wreak havoc on an engine.

------------------
Clint L.
White 95 Cobra #3637
58cc GT40X heads with mild porting, Crane 2031 cam, FRPP 65 TB, 1.7s, Cobra intake, homeade cold air, 155lph, pullies, Tokico Illuminas, C springs, GW lower control arms, Steeda CC plates, aluminum driveshaft, Steeda quadrant, MSD6A, Mac shorties, off road hpipe, 2 1/2 ultra flows w/ dumps, R hood, Euro clear corners, stock 3.08s
13.61 @ 104.7 w/ 2.22

StreetRacin89Stang · 05-04-2001, 01:54 AM

Im positive that your timing is too retarded. I had that same problem when i dropped my distributor after i rebuilt the top end. It even made my headerd red-hot. Get it set or set it yourself and your car will run amazingly better.

------------------
89 5.0 GT White w/Blue Racing Stripes
K&N, 73mm Mass Air, Ported and Polished Stock Heads, E303 Cam, MAC equal Length Headers, Off Road H-Pipe, Borla Mufflers, 3.73's Sway Bars, Strut Tower Brace, Subframe Connectors, Eibach Springs, Koni Adjustables/Reds, Pony 5 Stars, 1000 Watt JL Audio System, No P/S , No Smog Pump

smokedchevy · 05-04-2001, 02:35 AM

Check for an exhaust leak. Mine used to do that but it was due to an exhaust leak.

05-03-2001, 09:05 PM	#1
blueneonman1 Registered Member Join Date: Mar 2001 Location: Palm Harbor, FL Posts: 208	Loud backfires?? In my GT, when I am going over 50mph and drop it down into 2nd to let the rpms rev in a downshift, my car will almost always backfire. Sometimes it does one loud BANG! and sounds like a sawed-off shotgun and other times it just gurgles till the rpms drop. I must admit, I love the shotgun sound and how it makes joggers take a double-step when I do it next to them, but I want to know why it does this and if it is bad. Some people tell me it's timing and that my timing is too retarded. Is this correct or is there some other reason? I have 73,000 miles on my car and have never changed the fuel filter. I'm wondering if that is the problem because it never backfired 20,000 miles ago, with my old engine. Then at around 50,000 miles it started. I got a new engine in at 65,000 miles and it backfired on that from day 1. So what is making these backfires? ------------------ Blueneonman - '95 5.0L Mustang GT Convertible \| K&N Drop-in \| FMS 9mm Wires \| Hollow Cats \| Flowmaster 2 Chambers \| Subframes \| 6-pt Rollcage \| 14deg Timing \| King Cobra Clutch \| FMS Adjustable Clutch Cable \| Coolest Neon Lighting on a Mustang EVER! Best time: 14.8 @94mph

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05-03-2001, 11:32 PM	#2
les1 Registered Member Join Date: Mar 1999 Location: seattle Posts: 76	timing is one of the only thing that can do that set it to 10 and dont forget to unplug the computers timing compensator.also if you can floor it and it runs good your filter is fine

05-04-2001, 01:12 AM	#3
TEXSN95 Registered Member Join Date: Mar 2001 Location: college station, tx Posts: 143	You should have changed your fuel filter about 50,000 miles ago. A clogged filter can wreak havoc on an engine. ------------------ Clint L. White 95 Cobra #3637 58cc GT40X heads with mild porting, Crane 2031 cam, FRPP 65 TB, 1.7s, Cobra intake, homeade cold air, 155lph, pullies, Tokico Illuminas, C springs, GW lower control arms, Steeda CC plates, aluminum driveshaft, Steeda quadrant, MSD6A, Mac shorties, off road hpipe, 2 1/2 ultra flows w/ dumps, R hood, Euro clear corners, stock 3.08s 13.61 @ 104.7 w/ 2.22

05-04-2001, 01:54 AM	#4
StreetRacin89Stang Registered Member Join Date: Dec 2000 Location: Bay Area, California Posts: 63	Im positive that your timing is too retarded. I had that same problem when i dropped my distributor after i rebuilt the top end. It even made my headerd red-hot. Get it set or set it yourself and your car will run amazingly better. ------------------ 89 5.0 GT White w/Blue Racing Stripes K&N, 73mm Mass Air, Ported and Polished Stock Heads, E303 Cam, MAC equal Length Headers, Off Road H-Pipe, Borla Mufflers, 3.73's Sway Bars, Strut Tower Brace, Subframe Connectors, Eibach Springs, Koni Adjustables/Reds, Pony 5 Stars, 1000 Watt JL Audio System, No P/S , No Smog Pump

05-04-2001, 02:35 AM	#5
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	Check for an exhaust leak. Mine used to do that but it was due to an exhaust leak.