Anyone, please help!!! I own a 2002 Mitsubishi Lancer OZ, currently having 207,000 miles on it, yea I know, alot LOL. Anyhow, I bought it brand new back in 2001, and its been running fine until recently. I've done the normal maintenance on it with changing the oil/oil filter, clutch (when needed), tranny fluid, etc. Only mods I have on it is an exhaust with 2 3/4's piping and an air intake.

I just diagnosed it and it came back with "Cylinder 2 Misfire detected". I know that I just recently changed the spark plugs as well as the O2 sensor before the Cat, as well as checked my wires to make sure they were ok, but there's still no solution to my problem. Also, I know for a fact that its not burning the fuel too well, because i can smell the unburnt fuel coming out of the exhaust...

Any help would be appreciated!!!

Thanks,

T.

 

well when my Coil pack when out it would missfire when idling with the Ac on , if it doesnt do that then its probably your wires or Coil boot , you cant tell if wires and coil boot is out , they mess up inside also .
So just buy new wires and 2 new coil boots, should be only 30 bux +tax at Autozone

And would help to clean ur mass sensor also

 

damn 2 3/4" has got to be killing you on the low end torque. A miss fire like that with that many miles is almost definatly a coil pack. pricey, about 80-100$ a pop.

 

even though you've already had your plugs changed recently, i'd still take out your #2 plug and check it first. i had this problem not even 1k miles after i changed my plugs. the ground had somehow either broken off during installation(which i doubt because it ran fine for a while) or burned off (defective plug?).

 

Thanks for all of your replies. I'll just switch out the coil and the wires, given that they're the original ones anyhow, lol. And I've checked all of my plugs yesterday, and they were still fine. But I'll change out the coil's and the plugs and see how that goes. I'll keep you guys updated.

Thanks,

T.

 

Hey guys,

Thanks for your help. I went and purchased a new coil, and wires, and changed them out. The car runs great again. All is well.

Thanks for your inputs!!!

T.

 

your welcome
Any time we can help let us know

 

no worries

 

Just for everyones information, if you have a misfire and suspect your coils, here are a few things to consider.

1. Lancer uses a waste spark ignition system. There are two coils, one controls cyl 1 and 3, the other 2 and 4. 1 and 3 fire simultaneously, as do 2 and 4. The spark occurs on both, even when one is one the exhaust stroke. Thus, the one spark is WASTED, hence the name. This is cheaper than using 4 individual coils. However, a bad coil will usually cause a miss in both cylinders that it controls. A miss in 1 and 3 is a dead giveaway that the coil (or wire) is bad.

2. The two coils are interchangable. I'm not sure if they bolt up to the valve cover the same, and it's raining here so I'm not going to check. But you can switch them if you suspect the coil is bad. The misfire should follow the coil when you move it (duh!)

3. If this does not cause a change, or you have a random misfire code like P0300, you may have an issue with either the primary ignition circuit or air-fuel metering. A test light grounded to the head with the probe inserted into the coil primary connector should flash while the engine is running. I don't know which wire it is off the top of my head and again I don't feel like getting wet but you can try them all until you find the proper one. A lack of a trigger signal usually means the crank sensor is bad, though this problem is often much more subtle. Also check fuel trim numbers, as a misfire could be caused by an excessively rich or lean mixture EVEN IF IT IS NOT BAD ENOUGH TO SET A CODE! I believe our cars will not set a rich or lean code until the ECU has reached -30% or +30% long term fuel trim compensation.

4. Because of the way waste spark works, a worn spark plug in cylinder 4 can cause a miss in cylinder 2. Likewise for 1 and 3. The secondary ignition voltage goes from the coil through the one plug, through the cylinder head, then backwards across the other plug (from ground to tip) and then through the other spark plug wire and back to the coil. A bad wire going to cylinder 3 could cause a misfire in cylinder 1. Get the point? Always look at the entire circuit when diagnosing a misfire.

Hope this helps in the future.

 

Cools, thanks for your inputs :-)

 

i have the same problem
need to get it fixed
hopefully i will have some good luck
thanks guys

 

Driving a car with a miss will cause severe damage to the catalyst. If you have a flashing CEL, call a towtruck. If you drive on it you'll regret it.