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Old 06-22-2001, 05:59 PM   #1
hillman
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Default Local NGK Source, P0302 #2 Misfire Code

File Under: Learn something every day.

I dropped the Legacy off at the dealer to have them tell me why it was idling rough and lighting the Check Engine lamp. They pulled a P0302 code, which indicates a #2 cylinder misfire.

According to them, the #2 spark plug is completely worn out after just 26,000 miles, and it is running on three cylinders.

I'm significantly shocked that a plug in that engine could be that far gone that quickly, and never even thought to check them. ( I assumed the oxygen sensor was the culprit. )

Anyway, I see no point in letting them put another set of junk plugs in. Does anyone know where I can get NGKs for an EJ25 locally? I usually order all my NGKs from Monarch in California, but I need them sooner than later this time.

Thanks in advance.
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Last edited by hillman; 06-22-2001 at 06:23 PM.
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Old 06-22-2001, 06:43 PM   #2
zzyzx
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NGKs are common. Get BKRE6-11 coppers. They're 6 bucks and change. You should be able to go to any chain auto store and pick them up. There are also spec'd in your owner's manual - so confirm it there.

- Steve
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Old 06-22-2001, 07:05 PM   #3
8Complex

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Thats BKR6E-11. Any Trak or whatever and you're good to go.
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Old 06-22-2001, 07:11 PM   #4
hillman
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NGK claims PFR5B-11 is the OEM replacement. Regardless, I have just called damn near every auto parts chain we have around here, and only a very few claim to carry any NGK plugs at all, much less this one.

I did find a place in Rolling Meadows which has the correct plug in stock, but they closed while I was on the phone with them. I'll have to go in the morning.

Thanks.
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Old 06-22-2001, 07:42 PM   #5
8Complex

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Actually, not sure on your motor, but in the manuals for mine it called for that BKR6E-11. Yours might be lower compression and require a BKR5E-11.

The PFR5B-11 number is just another way of reading their plug codes. http://www.ngksparkplugs.com/techinf...tnumberkey.pdf

Looks like the PFR5B-11's are equivalent to the BKR5E-11's that the MY98-99 RS's use.
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Old 06-23-2001, 02:58 AM   #6
HndaTch627
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Thumbs down

Gotta love Foreign Car Parts....they are 2 blocks from my house...Okay Pep boys have the BEST stock of NGK's, problem is finding a parts guy that has a clue.

Jeremy
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Old 06-23-2001, 12:28 PM   #7
hillman
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Foreign Car Parts was the place I was going to go this morning, but I found Fornparts in Downers Grove had both BKR6E-11 and PFR5B-11 in stock. The BKR are copper, and the PFR is platinum, apparently. ( $2.99 per for the BKR6E-11, btw )

At any rate, I replaced the plugs just now, and although I had to remove the intake piping and windshield fluid reservoir, it was easy enough.

Unfortunately, and as I expected, the problem does not appear to have been a worn-out plug, and new plugs did not fix the problem.

I'd be interested to hear any further specific suggestions wrt to the cause for a P0302 code ( #2 cylinder misfire ).
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Old 06-23-2001, 01:31 PM   #8
HndaTch627
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Well seein as how that Engine uses a DIS system a P0302 really could only caused by one other thing, now my question is if the engine stumbles or hesitates. Usually if you have a misfire you can feel it. OTher causes would be a faulty injector, an o2 Sensor getting touchy and sensing a false misfire code(have seen this), a bent/stuck valve or valve guide or valve seat. Most likely though i'd say injector or bad wire. Try swapping wires with a known good one and see what happens. Not to much else in that system to cause a misfire. If there is no problem with the wire i would suggest getting a NOID light to check for inkector pulse to your #2 fuel injector. ALso at this point you can take the resistance reading of the injector, you will have to get a manual in order to get the spec...but hey it's a cheaper way to start then just throwing parts at it. I really doubt a coil pack problem because on a DIS system you would feel it affect 2 cylinders(if i remember right, has been a while since i worked on them)...But in any case good luck on the diagnostics.

Jeremy
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Old 06-25-2001, 12:36 PM   #9
hillman
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( <strong>NB</strong>: The code was P0302. I made a typo in the subject, and subjects are not apparently editable. )

The engine stumbles and hesitates, although I think it is running on all 4 cylinders above 3500 rpm or so. My original guess was an oxygen sensor, too.

According to the original service advisor, they swapped the number 1 and 2 plugs, and the misfire switched cylinders. ( Or at least, the code did. ) If that is true, I have no idea what the problem is, since I replaced all 4 plugs on Saturday without fixing the problem.

It would seem that their test eliminated variables farther upstream from the plug, but apparently not.

Regardless, the Legacy is back at a dealer today, and I advised them to keep it as long as necessary, just give it back fixed properly. Hopefully, this won't be a problem I have to find, but thanks for the suggestions.

I'll let you all know what they find, since I think it could be applicable to any EJ25.
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Old 06-25-2001, 12:59 PM   #10
HndaTch627
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Lightbulb

I was just thinking about this a minute ago and if it was an injector malfunction the ECU should be able to pinpoint it.; I find it VERY hard to be that the spark plug was the problem, sounds to me like a burned/bent valve. But in any case hope the dealer takes care of ya.

Jeremy
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Old 06-25-2001, 02:11 PM   #11
hillman
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I just talked to Dan Wolf service, where the Legacy is now, and they apparently replaced the #2 injector and claim, "It is ready to go."

That makes sense, but not with respect to the test supposedly performed earlier by Roto.

If the problem is genuinely fixed now, my opinion of Roto's service will descend even farther. If so, either they are not capable of performing a simple test accurately, or they did not even try.

Thanks for the help.
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Old 06-25-2001, 02:46 PM   #12
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Very interesting! That is what my 98GT has been coding recently. Of course mine go's code crazy every once and a while! It will be very interesting to hear the outcome of that injector!

Steven
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Old 06-26-2001, 02:47 AM   #13
HndaTch627
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Arrow

See now most ECu's Should be able to pick up an injector malfunction. Weird that it was only Coding a P0302. Now if they would have looked at the O2 Volatge during that misfire they would have noticed a lean miss which would signal an injector fault. But in any case, i'll be curious to hear the outcome.

Jeremy

P.S. After u hit 3500 RPM you won't feel a misfire because your powerstrokes are so frequent. Idle would be the most noticeable
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Old 06-26-2001, 10:42 AM   #14
hillman
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Default

Dan Wolf service replaced the #2 injector and all seems to be well. The receipt noted the reason for replacement as "Ohms too high", which I thought was interesting.

Roto service claimed the only two officially listed causes for a P0302 code were bad plug and bad wire ( apparently thinking that a bad injector would send a different code, as you suspect ).

That doesn't seem to be the case, unless they just read the code wrong or screwed up in some other fashion.

I wasn't referring to feeling the misfire, but rather the power, or lack thereof. I could only feel the misfire at idle, but below ~3500 the car was clearly sluggish. Above that, it seemed normal.

Regardless, it seems to be fixed now; although I am left wondering if this was a defective injector or if I'm going to go through this three more times. Speaking of which, how can the code be read without a visit to the dealer?
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Old 06-26-2001, 01:13 PM   #15
HndaTch627
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Thumbs up

WEll i am glad they got it fixed for ya. JUst weird that the computer couldn't figure the problem out for itself. INjector's impedence really is the only way to test them without doign an injector balance test which 98% of techs frown on because they are rather inaccurate on stock injectors. But in any case glad they got it fixed, when u have air and spark the pnly thing left would be fuel

Jeremy
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Old 06-26-2001, 04:29 PM   #16
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Default Got mine

I got mine in Lombard on Main street just south of Roosavelt at a place called Shamrock Auto Parts. I just walked in one time to see what the place was like and they had them in stock.
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Old 06-27-2001, 12:04 AM   #17
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did you talk to your dealer? the parts guy at mine told me they stoped putting champs in and they run only NGK in the new cars they even had them in stock. For about 5 bucks not a bad deal.
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Old 06-27-2001, 02:40 AM   #18
HndaTch627
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Talking

Japanese cars should only get NGK or Denso Plugs, Except in 8's case where the NGK's Melted down....Hey 8 my boss' civic did something like that too, started missing today and pulle dthe plugs tonight, melted the electrode off #3...can u say lean?? whoops. In any case glad you got the car running and back and FIXED RIGHT!!

Jeremy
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Old 06-27-2001, 12:22 PM   #19
hillman
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Roto apparently uses NGKs. When they replaced one plug in my engine, they used an NGK.
( Which I have at home now, because I replaced all four. )

If anyone needs 1 NGK BKR6-E11, let me know.
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Old 12-21-2007, 11:59 PM   #20
06gto400
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is there any other things that would cause it to throw a PO302 code? cuz i took mine to the dealer today and it pulled that code but it said it was a speed sensor malfunction. and recently my speedometer and odometer stopped working? and i cant find any other code for it.
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Old 12-22-2007, 09:29 AM   #21
MotorCity
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Holy Old Post Bump. Batman.

Codes could have changed what year car?

Never mind.. I see 05' WRX
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Old 12-22-2007, 09:31 AM   #22
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I think he typo'd on the post.. The thread header say Code P3023....
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Old 12-22-2007, 02:38 PM   #23
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Quote:
Originally Posted by MotorCitySTI View Post
Codes could have changed what year car?
I don't think codes under 1000 ever change as long as it is a true OBD-2 system. I'm pretty much they're set as standards.
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