I got a very bad backfire problem. My car idles fine. But when stomp on the gas, it backfires heavly! It doesn't backfire if i step on the gas slowly. If anyone know anything about backfire please help me!!! I do have a OBX muffler and took the cat conv out. There are no exhaust leak. SO what ever you think other than that, hit me back!

1995 Eclipse RS

Of course I'm going to ask if you have any CEL's but my first guess would be to look over my plugs and wires. You might have a faulty plug that is not playing nice under a load.

Shit is all apart. Typical...

check your O2 sensors.

dsm/mitsubishi service manuals https://www.mediafire.com/folder/5k14qlaulb9s1/dsm_mitsubishi

service manuals(my whole collection) https://www.mediafire.com/folder/ac51jwwa3g1n1/automotive_manuals

I did check my plugs and wires. My wires are about a month old, and plugs are set at the right gap. I don't know about the O2 sensor, I guess I'll try that next. Is that a common problem that the O2 sensor messing up???

1995 Eclipse RS

you're getting that cool...plop!plop! noise? it happened to me and it's cool to see the fire shoot out my exhaust, that's just you're O2 sensor reading too rich fuel for some reason. i had that problem due to the o2 sensor wire being exposed a bit, it got wet, and my sensor reading was sky high in the 4.000. i was like damn. i step on the gas and i was getting mad backfire, like the way motorcycles get. people were like freaking out seeing the little fire coming out of my exhaust.

Man I couldn't afford the damn O2 sensor, so i started thinking about the first time it backfired couple of months ago. Back then, all i had to do was to change out the plug wires. I just got some new ones about two months ago so i didn't think they could be the reason. But i changed them out anyway. Guess what, it fixed it! It was simple as that! But, do plug wires get damaged this easily???

1995 Eclipse RS

if the o2 sensor is ok, check the reading. then if its still ok, go back and check the resistence of the spark wires, then make sure the plugs are still ok. then the coil etc...
cool



Michael 99gs
HRC Stage 2
Stage 3 process begins anyone got a 420a block thats not spun/head for sale?

http://www.dreamwater.net/purplebeast

Michael
99gs hrc stage 5000 SOLD...
2004 Honda Accord V6 (240 hp)stock
what other car should i buy?? hmmm
Car info & pictures at http://www.cardomain.com/memberpage/520269

You might just wanna go out and buy some cheap ass plugs that are pre-gapped so you know that you didn't gap them wrong for sure. I bought a set of NGKs and gapped them correctly (or so I thought) and my car idled and ran like crap. It also stumbled under anything more than 1/2 throttle. So, on a hunch, I went out and bought Bosch platinum +4s. Problem solved. The cheapest plugs for my sister's neon were $8 for all four. Car runs fine. It's worth a shot.

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check your plug wires first then check all of your vaccum lines.those
are your 2 main thing to do.

AEM CAI, Greddy EVOlution exhaust, B&M shifter, David Brode Custom straight pipe extruded intake manifold, slight port and polished head, fidanza cam gears, crower stage 3 cams, and not tuned yet ( cam gears are on 0)

Planning to add HRC stage 4, AFX UDP, Modern performance 60mm T-b

Check your plugs to see any fouling from running too rich, the O2 could be bad, the spark plug gap could be off.

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Kon C

"Sometimes, a man has to do what a man has to do."