Backfire

86GT · 06-05-2001, 09:47 PM

Over the last 2 days my car has been backfiring under part throttle under load. When in neutral there is a miss when revved high. My fuel pressure is at 38psi with vacuum line off, timing at 10 degrees. I have cats, long tubes. Had an annoying small leak that was like a ticking sound before. Could the backfiring be caused by this?

My plugs all looked good, tan colour. I don't know how to check plug wires, so that could be a problem, but they all look good.

Any suggestions?

blueneonman1 · 06-06-2001, 12:43 AM

Here's how to check for bad plug wires (arcing). Find a real dark place. Open you hood and let the engine idle. Look for a glow around your engine...that's arcing. Also, you could try spraying misted water around the engine where the plug wires are. Careful.

------------------
Blueneonman - '95 5.0L Mustang GT Convertible | K&N Custom Cold Air Intake | FMS 9mm Wires | Hollow Cats | Flowmaster 2 Chambers | BBK Subframes | 6-pt Rollcage | King Cobra Clutch | FMS Adjustable Clutch Cable | Coolest Neon Lighting on a Mustang EVER!

Homepage: http://www16.brinkster.com/blueneonman/

Best time: 14.578 @96.20mph

86GT · 06-06-2001, 06:00 PM

Put in new plugs, wires, cap and rotor and it seems to help. The old wires never glowed or anything like that...

Could it be anything else? I don't want to have to change plugs every two months...

Unit 5302 · 06-06-2001, 11:19 PM

Broken or failing fuel injector.

smokedchevy · 06-06-2001, 11:58 PM

Is the ticking sound an exhaust leak? I had an exhaust leak on my 92GT( flows with off-road h-pipe and 6# blower)and when I let off the gas or decelerated, every now and then it would have a huge backfire. I mean it sounded like a grenade went off under the car. I found the flange on the pipe to the hedder had a small gap and that caused the backfiring. I sealed it up and it went away.

86GT · 06-07-2001, 10:01 AM

Unit, how would I go about having them checked? They're only a couple months old, and are ford 24#ers.

As an updated, there is no major backfire any more and it seems to run a lot smoother. I still have that annoying exhaust leak, and it only sounded like a grenade once last night when I drove it hard.

06-05-2001, 09:47 PM	#1
86GT Sniffed too much n20 Join Date: Oct 1998 Location: Ont, Canada Posts: 1,018	Backfire Over the last 2 days my car has been backfiring under part throttle under load. When in neutral there is a miss when revved high. My fuel pressure is at 38psi with vacuum line off, timing at 10 degrees. I have cats, long tubes. Had an annoying small leak that was like a ticking sound before. Could the backfiring be caused by this? My plugs all looked good, tan colour. I don't know how to check plug wires, so that could be a problem, but they all look good. Any suggestions?

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06-06-2001, 12:43 AM	#2
blueneonman1 Registered Member Join Date: Mar 2001 Location: Palm Harbor, FL Posts: 208	Here's how to check for bad plug wires (arcing). Find a real dark place. Open you hood and let the engine idle. Look for a glow around your engine...that's arcing. Also, you could try spraying misted water around the engine where the plug wires are. Careful. ------------------ Blueneonman - '95 5.0L Mustang GT Convertible \| K&N Custom Cold Air Intake \| FMS 9mm Wires \| Hollow Cats \| Flowmaster 2 Chambers \| BBK Subframes \| 6-pt Rollcage \| King Cobra Clutch \| FMS Adjustable Clutch Cable \| Coolest Neon Lighting on a Mustang EVER! Homepage: http://www16.brinkster.com/blueneonman/ Best time: 14.578 @96.20mph

06-06-2001, 06:00 PM	#3
86GT Sniffed too much n20 Join Date: Oct 1998 Location: Ont, Canada Posts: 1,018	Put in new plugs, wires, cap and rotor and it seems to help. The old wires never glowed or anything like that... Could it be anything else? I don't want to have to change plugs every two months...

06-06-2001, 11:19 PM	#4
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Broken or failing fuel injector.

06-06-2001, 11:58 PM	#5
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	Is the ticking sound an exhaust leak? I had an exhaust leak on my 92GT( flows with off-road h-pipe and 6# blower)and when I let off the gas or decelerated, every now and then it would have a huge backfire. I mean it sounded like a grenade went off under the car. I found the flange on the pipe to the hedder had a small gap and that caused the backfiring. I sealed it up and it went away.

06-07-2001, 10:01 AM	#6
86GT Sniffed too much n20 Join Date: Oct 1998 Location: Ont, Canada Posts: 1,018	Unit, how would I go about having them checked? They're only a couple months old, and are ford 24#ers. As an updated, there is no major backfire any more and it seems to run a lot smoother. I still have that annoying exhaust leak, and it only sounded like a grenade once last night when I drove it hard.