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Old 04-11-2005, 05:23 PM   #1
Anub1s
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Default About to panic please help

I am having trouble with my car and I don't know what it is. I threw a lean code a while back and took it into the dealer to determine what was wrong with my car, they said that the Front o2 sensor is bad. So this morning i replaced that and took it for a drive. Now I am getting a Cylinder 3 misfire (P0303) Code. I checked the coil and it is good as is the spark plug.

What can cause this? I have the factor manual and I have been frantically looking to see what could be wrong and what I can check with what I know. I am shaking as I am typing this because I am so close to having a panic attack it's not even funny. I am screwed to no end if I can't figure this out.

Please help me with what you all know.
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Old 04-11-2005, 06:04 PM   #2
jigga
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i think some of the earlier cars had issues with misfires and the like iirc, and needed a reflash to deal with them...Might be the problem..

Do you have any mods?
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Old 04-11-2005, 06:05 PM   #3
MB38
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YOUR CAR IS GOING TO EXPLODE. GET AWAY FROM THE GARAGE RIGHT NOW.
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Old 04-11-2005, 06:10 PM   #4
Anub1s
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Mods:
Helix V.2 Header
HKS up-pipe
Invidia TBE
Perrin CEL fix
Had AccessPort stock map, un mated it from ECU thinking this was the problem, didn't fix it. I even tried a couple of other maps. Didn't work either.
GFB BOV

MY02 WRX I pulled the plug again on #3 cylinder and it had a little oil build up on it. I hope to god I do not have a blown piston ring, but that would not explain why at Higher RPM's the car is next to fine. Injectors maybe?
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Old 04-11-2005, 06:30 PM   #5
dug-e-fresh
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I've never seen oil on any of the plugs I have changed, except on my blown WRX motor.

If you REALLY have oil on the plug, do a compression test. STAT. Oil fouling will definitely throw a misfire code.

def
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Old 04-11-2005, 06:33 PM   #6
dug-e-fresh
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http://forums.nasioc.com/forums/showthread.php?t=749388

check out the pics. compare your plug.

def
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Old 04-11-2005, 06:35 PM   #7
Anub1s
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It wasn't actually on the electrode it was on the threads come to think of it. This is because of my leaky valve cover gasket, which is due to be replaced in the next week or so. There were some deposits on there from running extremely rich but like I said, the plug is not fouled it is fine.
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Old 04-13-2005, 04:53 PM   #8
Anub1s
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I towed the thing to the dealership yesterday and had them look over it and put it on the diagnostic machine again. No dice, they inspected for vacuum leaks and open circuits and fixed a couple of little minor things and it still doesn't run correctly. I have a stupid K&N Typhoon intake, that is going to be gone tomorrow replaced by the stocker. I will see if this works, although I doubt it. If not I will be taking out the fuel injectors and having them flow tested and rebalanced. I am choosing not to go with upgraded ones right now because I just want reliability for a while.

Has anyone here had problems with their injectors being stuck open or cracked? It would explain my misfires and why I run so rich at idle. Let me know the details, thanks!
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Old 04-14-2005, 11:02 PM   #9
slick50
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Interested in the outcome keep us posted
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Old 04-23-2005, 07:48 PM   #10
Anub1s
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Okay to update you, I got my car back from the dealership and basically they told me the would do nothing for me because my car was not stock *BS*. I took the injectors out to get them cleaned and flow tested, and took the intake manifold off so I could replace the gaskets and clean stuff and replace a couple of sensors that were there.

Well after a few days of having my car apart now, I started to put it back together. I got the injectors back from the cleaning place and he said they flow better than most Corvette and Porche injectors he's seen, good news yet bad news at the same time. I still don't know what is wrong, I bought a new Coolant Temp Sensor and put that in today as well.

So I get the injectors back in and those stupid green monster cover thingy's (sort of). And I go to get the new Intake Manifold Gaskets (yes it's been quite the adventure) And noticed that they gave me the wrong damn gaskets! They gave me the gaskets for the Tumble Generator/Head mating surface intead of the Intake Runners/Tumble Generator surface. I am so damn pissed off! Now I have to wait until wednesday when they get the new gaskets in....GOD!

Anyways here is a pic of my intake runnerless engine bay and the inlet to my turbo (because I could)







I'm taking requests for pictures if you need some while that is off, let me know
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Old 04-23-2005, 08:32 PM   #11
hotrod
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If the engine is mechanically sound (ie passes compression check) and you've eliminated the fuel injectors (did they flow test the injectors --- if they did put the richest injectors in the rear cylinders).

I'd focus on the ignition side. There is a known issue with the little snap clips on the wire loom to the coil packs breaking their lock tabs as they get older. Take a good look at the white and black clips that plug into the coil packs and check the condition of the locking tab that holds them in place. If the tab breaks the connector is loose in the coil pack and will throw a BAD miss --- in mine the two rear connectors on both sides gave up and would come off every time I went WOT due to vibration. You can work around this problem by looping a zip tie around the coil pack to hold the connector in place. You can't buy replacement connector ( at least not a few months ago) so you would have to replace the engine wire harness to get a permanent fix for this problem.

Next just replace all your plugs --- cheap and simple way to exclude them as the source of the missfire. Be sure to double check your gaps. For this occasion gap them in the middle of the recommended range -- that will elminate a miss caused by too narrow or too wide spark plug gaps.

Be sure all the plugs are properly torqued -- a loose or overtightened plug can give you misfires due to broken internal seals on the plug or loss of compression too.

Last swap around your coil packs and see if the miss follows one of the packs.

Hopefully that will narrow down the problem.

Larry
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Old 04-23-2005, 09:24 PM   #12
Anub1s
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Thanks Larry, but I have already tried every single thing you just listed and it's not the problem, which leads me to believe it is either the Coolant temp sensor, or a rear o2 sensor I have already replaced the front which did not fix it either. I did have them flow tested and all were within a close range of each other so I didn't care where I put them. I replaced all o-rings and grommets while at it so that won't be a problem any more.
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Old 04-23-2005, 09:36 PM   #13
ronf
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a good pics of the
1 PCV area
2 under the TMIC showing oil gally plug area
will be highly appreciated.
thanx
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