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06-26-2005, 12:14 PM | #1 |
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SWIC
Location: Tucson, AZ
Vehicle:2018 Jeep Wrangler |
how do my plugs look? 2004 wrx, 45K miles, Cobb Stage II for 35K
Here is a picture I took of my stock plugs when I pulled them yesterday. How bad does the detonation look? I swapped 'em for a set of NGK BKR7E coppers (one step colder). Hopefully next time they'll look a little better. This is the first time I've changed spark plugs before, so I don't have much to compare them to.
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06-26-2005, 12:42 PM | #2 |
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Join Date: Mar 2005
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NESIC
Location: Bristol, CT
Vehicle:2007 350Z Silver |
I'm looking thru my newbie tuning book which has pictures of how to read plugs and it looks like your running to hot. The book recommends...
Check for correct plug heat range over-advanced ignition timing lean fuel mixture intake manifold vacuum leaks sticking valves insufficient engine cooling |
06-26-2005, 02:06 PM | #3 |
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Join Date: Apr 2005
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SCIC
Location: San Diego
Vehicle:2003 2.5L bugeye now with 6 spd 20g! |
one things for sure, they were due for change a while ago.
I see some brown so they were fine at one time but all that chalk on them means that the plugs where over heated. you should try some one step colder plugs. |
06-26-2005, 02:14 PM | #4 |
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Location: Scottsdale AZ.
Vehicle:RIP I'll always be The Ver8 Magistrate |
Looks like aluminum from detonation.
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06-26-2005, 03:03 PM | #5 |
Scooby Specialist
Member#: 84912
Join Date: Apr 2005
Chapter/Region:
SCIC
Location: San Diego
Vehicle:2003 2.5L bugeye now with 6 spd 20g! |
doesnt have to be aluminum. I've seen plenty of plugs like that before. I would rethink keeping the COBB though, I just keep seeing bad things with it.
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06-26-2005, 04:58 PM | #6 | |
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Member#: 37719
Join Date: Jun 2003
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MWSOC
Vehicle:2003 WRX |
Quote:
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06-26-2005, 05:02 PM | #7 |
Scooby Specialist
Member#: 84912
Join Date: Apr 2005
Chapter/Region:
SCIC
Location: San Diego
Vehicle:2003 2.5L bugeye now with 6 spd 20g! |
haha, funny.
im not going to say anything negative about the cobb cause I dont have one, but several friends run it and reliabilty is an issue. |
06-26-2005, 07:21 PM | #8 |
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Vehicle:04 WRX Ver. 8 swap /87 FJ60 /Hewes Redfisher |
mmmm. looks like sugar coated Hershey kisses! EYUMMY!!
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06-26-2005, 08:26 PM | #9 |
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Vehicle:2011 Forester 2.5X Dark Gray Metallic |
according to my trusty ol chilton's subaru book, those plugs have just been in the engine way too long. the spark plug gap looks fine though so i dont think you have a detonation problem.
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06-27-2005, 12:13 AM | #10 |
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....old and need a step colder plug
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06-27-2005, 08:37 AM | #11 |
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Join Date: Mar 2003
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Location: Tucson, AZ
Vehicle:2018 Jeep Wrangler |
Thanks for the advice.
Uncle Scotty -- I could have sworn reading earlier posts from you recommending against changing the stock plugs before 60K, saying something like "if it ain't broke, don't fix it." I thought changing them at 45K was even a bit early. Every time I've seen someone ask when they should change their plugs, they get pointed to Unabomber's FAQ or the Subaru maintenance schedule, all which say they stock plugs on a wrx should be changed at 60K. I know that a stage II tune will make things a little hotter, but in all of my daily browsing of this forum I haven't seen anything to suggest changing the plugs early. Hopefully others can learn from this situation. |
06-27-2005, 03:44 PM | #12 |
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Join Date: Mar 2005
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Vehicle:2007 350Z Silver |
I read somewhere that when you reach 300 crank HP, go one step colder.
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06-28-2005, 08:57 PM | #13 |
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Vehicle:OK buy Nates beans westcoastroasting.com |
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