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Discussion Starter #1
I have a 02 WRX Wagon and everything is stock on the car. I scanned the car and it read P0301,P0302,P0303, and P0304. It is mis-firing on all four cylinders.

I replaced all four sparkplugs, and all four coil-packs, but still the light came back on. All four cylinder is still misfiring.

Should I change the MAF sensor? It look kind of dirty and I clean it a couple of time already. The engine doesn't said any thing about the MAF sensor, so I'm not sure about changing it.

At this point I don't know what to do any more, and the dealer is not really helping, they just start naming a bunch of things to replace.

I also checked my Alternator, and it read 13.93 volts, I know that it a little below normal, so I'm thinking about replacing that too, but still I don't know what really cause it. HELP!!!!!!!!!!!!!!!!!!!
 

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Change the plug wires too.
:rotfl: OK..
Check the gaps on the plugs( .032) and maybe put alittle dialectric grease in the coil pack plug tower.Are they the right plugs?13.8-14.4v is normal alt output.Did you do one plug at a time?You cannot get the wiring harness mixed up or the wrong cylinder will be firing.
 

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Discussion Starter #6
:rotfl: OK..
Check the gaps on the plugs( .032) and maybe put alittle dialectric grease in the coil pack plug tower.Are they the right plugs?13.8-14.4v is normal alt output.Did you do one plug at a time?You cannot get the wiring harness mixed up or the wrong cylinder will be firing.
I replace all four plugs at the same time and all four coil packs at the same time. I got them from the dealership, so I'm assuming that it's the right one. Also the wire was plug back in correctly, black in the rear and white in the front. After that I reset the the engine light and it was fine for about 60 miles until the engine light came back up again. I was told that the only time that all four cylinder is misfiring is when you replace the fly wheel with a lighter fly wheel.

I want to check my grounds wire, but I don't know where each one is located at, can any body tell me where? Also what about the MAF sensor, should I replace that?
 

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Discussion Starter #8
Yes I do have an after market crank pulley, but I had it for about 2 years now, and everything was fine until now. Is that the problem?

Also any body knows where all the grounds wires at?
 

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Yes I do have an after market crank pulley, but I had it for about 2 years now, and everything was fine until now. Is that the problem?

Also any body knows where all the grounds wires at?
More than likely that's the problem buddy. I know it took 2 years to show up, but when you lighten either the pulley or the flywheel, it can cause the position sensor to think all 4 cyl's are misfiring.

Besides the timing being retarded, does the engine feel like it's running smooth?
 

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Discussion Starter #10
Most of the time it run pretty smooth, once in a while it spurted a little, with some awkward drop and rise in rpm of a couple hundreds. I figure that because it is running on limp mode due to the engine light.
 

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if you have the stock pulley... I'd swap it out, and reset the ECU (if you have a cobb AP) or unplug the negative batt cable for like 5 minutes
 

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if you have it... I'd try the stock pulley... the performance gain from the pulley is less than the drop in performance from the retarded timing.. So that's the first thing I'd try.

But hey.. it's up to you man. It seems like you've spent a lot of money to fix this problem so far.. and I'd put a week's paycheck that after all the stuff you've fixed, the pulley is probably the problem.
 

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Okay I'll swap it back, but I need to find one, I misplace mine some where.

Thanks
if you're going to buy one, call tristan at thekingofparts.com they specialize in both oem and aftermarket parts. One of the few dealerships that actually are mod friendly.
 

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Discussion Starter #16
Yeah, but it was time for a major tune up on the car anyway, and pretty much this is the last thing on my list. I'd replace everything from timing belts to radiator, so I hope this work.
 
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