Backfire Issue :D

[HoNdaInspire01]

I have no idea why my car backfire everytime I'm switching gears & downshift it fun going into tunnels but I dont want to get pull over by a cop it just sound like shotgun firing near my muffler. Does that mean I'm running rich. Is that good? , Haven't gotten pull over yet. I have oil in my spark plugs will that may cause that?

[Shadow1]

go to auto zone and get a valve cover gasket set. use the spark plug tube seals. upper and lower.

[quickangel93]

oil causing backfire? thats a first. if you poping in your exhaust system, your running rich. cus i has oil in my plugs on my lude and the car ran fine

[4thgentuner]

I have no idea why my car backfire everytime I'm switching gears & downshift it fun going into tunnels but I dont want to get pull over by a cop it just sound like shotgun firing near my muffler. Does that mean I'm running rich. Is that good? , Haven't gotten pull over yet. I have oil in my spark plugs will that may cause that?

does it backfire all the time??

do u have a cat. converter or a straight pipe?

cuz if ur running an open exhaust u will get a lot of snappin at wot and a backfire when u clutch in

[deevergote]

Is your Check Engine Light on?

If you're running rich, the most likely cause is an improperly functioning oxygen sensor. Additionally, if your spark plugs are covered in oil, they also aren't functioning properly (and if you're burning oil, that would certainly cause damage to your catalytic converter and oxygen sensor)

[HoNdaInspire01]

Is your Check Engine Light on?

If you're running rich, the most likely cause is an improperly functioning oxygen sensor. Additionally, if your spark plugs are covered in oil, they also aren't functioning properly (and if you're burning oil, that would certainly cause damage to your catalytic converter and oxygen sensor)

The check engine lights up everytime the car backfire. It's gets rough idle at the stop light, its tries to stay on around 500rpm but sometimes it just dies. I think a tune-up will help?

[quickangel93]

The check engine lights up everytime the car backfire. It's gets rough idle at the stop light, its tries to stay on around 500rpm but sometimes it just dies. I think a tune-up will help?

yea that and a valve cover gasket

[deevergote]

The check engine lights up everytime the car backfire. It's gets rough idle at the stop light, its tries to stay on around 500rpm but sometimes it just dies. I think a tune-up will help?

The check engine light only comes on when it backfires? That can't be right...

Pull the error code from the ECU (read the stickies to see how) That will tell you at least one problem.

Replace the oxygen sensor with an NTK or Denso sensor (no Bosch)

Replace your spark plug tube seals and valve cover gasket.

Replace your spark plugs.

[HoNdaInspire01]

The check engine light only comes on when it backfires? That can't be right...

Pull the error code from the ECU (read the stickies to see how) That will tell you at least one problem.

Replace the oxygen sensor with an NTK or Denso sensor (no Bosch)

Replace your spark plug tube seals and valve cover gasket.

Replace your spark plugs.

I only had to replace the spark plug wire & spark plugs after all. I went to my mechanical they told me my spark wires was worn over the years may cause shortage, after finishing install it. All of a sudden the car stop backfire everytime I change gears. Thanks for the help deevergote.

[deevergote]

If you have oil on your plugs, then you still need to change those tube seals. Though it wasn't the cause of the problem, it's still a problem itself!

[Jccck]

Mine backfires somtimes on a rev-match downshift..

Vroom! Dun dun dun pop
Sounds brilliant though, but slowly it makes a black mark on my rear bumper lol

I'm using a 2.5" metallic core high flow cat in addition to my exhaust setup.. So after punching it out of a corner, reaching another and downshifting to stay in the torque range there's always some fuel that gets through unused..
I have new upper/lower seals, new Iridium plugs and quality leads.. Before anyone asks

I wouldn't say it's a problem.. It's just life, running a modified car on a stock ECU will always cause this

[deevergote]

That is very true. More airflow means more fuel in stock ECU world.

A properly functioning o2 sensor and ignition components will minimize the issue though.

[wed3k]

check timing.