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Old 08-04-2008, 12:42 AM   #1
DieselClown
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Default first cylinder 1 misfire, after plugs, 1,3,4 misfire!

and a blinking CEL! I recently got one step colder NGK iridiums for my 05 WRX, vf39, supporting mods (to hopefully cure a cylinder 1 misfire) but literally 20 mins after the installation, the cEL came back. And about 2 days or driving, I pulled the code again and it was cylinder 1&3 this time. I then replaced cylinder one's coilpack to see if that was the original problem and no change at all. The misfire comes and goes randomly. I thought it was dirty wiring harness but I cleaned everything nicely.

a week later of no driving, then I get the code pulled again today and it's 1,3 & 4! Do you guys think that coincidentally, the one step colder plugs could have caused cylinder 2 and 4 to misfire as well? I honestly don't know what else to check. I'm thinking about just buy cheap NGK coppers (will that be ok with my vf39?) and seeing if thaqt fixes it. I wouldnt know how to check for bad wiring?

Please help. The car runs PERFECTLY and for some reason it started with the cylinder one misfire a few weeks ago. My friend datalogged the car and said there was nothing wrong mechanically, but he said it could be the gap. I bought the iridiums regapped at .028 from oakos. isn't that correct?

When i drive, i smell gas, so im not sure what that means.
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Last edited by DieselClown; 08-04-2008 at 12:48 AM.
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Old 08-04-2008, 12:58 AM   #2
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can somebody tell me what to possibly check for when taking out the plugs again? I remembered the first time this happened, when I swapped all 4 plugs...cylinder one's plug was noticeably more white. What does that mean?
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Old 08-04-2008, 07:19 AM   #3
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here's a pretty good page on reading plugs:
http://www.4secondsflat.com/Spark_plug_reading.html

as far as systemic misfires, it is unlikely to be the cause of all four plugs or coils. generally it's something more global, like AFR. do you have access to an OBD scanner? even better would be someone with a tactrix cable. i would be interested in your fuel trims, especially at idle. an exhaust leak, a front o2 sensor on the way out, a dirty maf sensor, an induction leak can all throw off the mixture enough to cause the car to miss.
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Old 08-04-2008, 02:46 PM   #4
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if your smelling gas, I believe its possible that your car isnt firing in those specific cylinders and its just kinda lurking through your system. Are you back firing a lot? along with hesitations and bucking?
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Old 08-04-2008, 02:56 PM   #5
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Quote:
Originally Posted by NewGwrx View Post
if your smelling gas, I believe its possible that your car isnt firing in those specific cylinders and its just kinda lurking through your system. Are you back firing a lot? along with hesitations and bucking?
what do these conditions indicate? My car does this. I changed the coils and the fuel pump and new plugs, It runs fine up to 12psi and 5000 rpm. If you floor it it hesitates at 5000rpm If you roll into throttle smoothly it will Go higher really well. I also changed my clutch and flywheel to a Sti 6speed unit in my 5 speed housing along with 4.444 conversion and front LSD , after my car was last tuned. Do you think the old tune could be my issue?

Last edited by frdawg; 08-04-2008 at 03:09 PM.
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Old 08-04-2008, 03:08 PM   #6
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thanks for the info. Im trying to see if somebody locally can help me scan my car again. I had a tatrix cable a long time ago, and if I find it, what software can i use? Enginuity?
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Old 08-04-2008, 03:11 PM   #7
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also, I have no excessive backfiring as far as I can tell. The hesitations are strongest at idle and lower rpms. It used to be random, but now it's constantly hesitating and I feel like I can walk faster than my car.
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Old 08-05-2008, 01:29 PM   #8
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I'm pretty close to being in the same boat as you are. Cylinder 1 and 3 seem to be the ones that like to miss on mine. I do backfire alot while giving it gas right after start up though. Just thinking about trying to find the source of my misfires makes me want to curl up in a ball. There are so many possibilities.

Keep us updated so that I can know if anything seems to help yours out. Could it be the 1 step colders? That's what I have too.
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Old 08-05-2008, 08:37 PM   #9
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thanks...i was thinking it could be the one step colder plugs too. Are they too much for a vf39?
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Old 08-06-2008, 06:33 AM   #10
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that depends on your driving habits mostly, and your tune to a lesser extent.
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Old 08-07-2008, 05:45 PM   #11
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I fixed mine. I had replacedtwo coils based off misfires on 1/4 cyl turns out 2/4 were really bad. Switched coils. And voilą

Last edited by frdawg; 08-08-2008 at 06:05 PM.
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Old 08-09-2008, 08:49 PM   #12
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thanks again all. I'm going to try swapping out coils to see if that works. So the .28 gap is correct on the NGK iridiums? I shouldn't touch that right?
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Old 08-11-2008, 03:34 AM   #13
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Just curious, did you actually measure the gaps or just assumed they were correct out of the box?

Always check the gaps regardless. Who knows who threw those boxes around before they got to you.
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Old 08-11-2008, 11:01 AM   #14
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yes, that gap is fine. I think anywhere from 28 to 31 is okay.
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Old 08-11-2008, 11:52 AM   #15
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Quote:
Originally Posted by Magnum626 View Post
Just curious, did you actually measure the gaps or just assumed they were correct out of the box?

Always check the gaps regardless. Who knows who threw those boxes around before they got to you.
i double-checked them before and they each measured around .28. do you think having the one step colder plugs made the other 2 cylinders misfire? Before i swapped plugs, only cyl 1 misfired and then only randomly. after i swapped them, 1,3,4 misfired.
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Old 08-12-2008, 11:23 AM   #16
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What plugs were they when cyl 1 misfired (heat range and type [copper, plats, iridium])? (Gap is .028-.031", not .28-.31")... Since you're running a vf39 I assume you swapped injectors, did you check to make sure they're not leaking, were they purchased new or were they tested?
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Old 08-12-2008, 12:34 PM   #17
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Even with the .028 gap it may need to be adjusted closer to the .031. As I had problems with the gap even at the the quote correct gap.
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Old 08-12-2008, 12:47 PM   #18
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they were the stock plugs when only cyl1 misfired. I thought it might have been the coilpacks, but when I swapped out all 4 plugs, the car was fine and the CEL cleared. Then about 20 mins later, it misfired again. the injectors are sti pinks which were new when i bought them. how do I check it they are leaking?
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Old 08-12-2008, 01:09 PM   #19
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I meant literally check if there is a fuel leak near, specifically around the o-rings since you said you smelled gas. If they're new though I doubt they would have an issue, unless the o-rings were torn. I would try to go back to the stock heat range - try out coppers because a few people (myself included) have had problems with iridiums and misfiring.
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Old 08-12-2008, 01:09 PM   #20
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misfires can also be caused by a bad tune, particularly fuel-related in the idle region.
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Old 08-12-2008, 01:38 PM   #21
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If a cylinder was not firing, the ECU would inject extra fuel to make up for the unburned O2 it's seeing at the O2 sensor. Things end up running so rich that the extra fuel causes more misfire events... that may explain your fuel smell. Also, it may sound weird, but if you're getting codes for cylinders 1, 3, and 4... then I would take a look at cylinder 2 first.

- Examine the condition of the plugs for clues
- Compression test (why is everyone so hesitant to do this?)
- test/check the ignition coils
- test/check the fuel injectors
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Old 08-12-2008, 02:23 PM   #22
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sorry but how do you do a compression test?
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Old 08-12-2008, 02:42 PM   #23
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i can get a hold of a scanner! Can somebody tell me what to look for?
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Old 08-12-2008, 07:25 PM   #24
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ok,...got the following freeze frame data.

shot term fuel trim 0.0
coolant temp 135
Lt fuel trim 7.8
Map 9.4
IGN ADV 16.0
IAT 113 degrees
MAF lb/min .506
ABSLT TPS 16.1

I'm not really sure what all this means!
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Old 08-13-2008, 02:17 AM   #25
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Compression test.

BTW, motoracer can do it for you also.

http://forums.nasioc.com/forums/show...mpression+test

Ahh just realized the pics are gone.
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