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Old 04-29-2013, 10:14 PM   #1
HelloMrBrahms
Scooby Newbie
 
Member#: 320094
Join Date: May 2012
Chapter/Region: SCIC
Location: aliso viejo
Vehicle:
07 sti
UGM

Default holy knock batman - 07 sti

I've run datalogs many times before and everything looked very much fine, knock was -1 or -1.5 MAX and only for 100 rpm or so ... so fast forward a few months, I got my 60k service at forman performance in orange county [for those of you who know].

I also got my spark plugs replaced with the 60k. he asked if I wanted the standard plus or 1 step colder plugs. I told him standard would be fine, but he recommended 1 step colder ... I questioned it since I only have stage 2 - [cobb sf intake, tomei ti exhaust and accessport on the base stage 2 91 ACN map].

after the service, everything seem like it ran great ... until very recently, my car seems like it sputters around 5-6k rpms when I'm on it hard ... it felt wrong, so I did a datalog and holy ****, the knock is crazy ...


anyone have suggestions ??

pic:

http://img855.imageshack.us/img855/3249/knockj.png
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Old 04-30-2013, 12:38 AM   #2
ProfessWRX
Scooby Specialist
 
Member#: 323379
Join Date: Jun 2012
Vehicle:
06 WRX

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Quote:
Originally Posted by HelloMrBrahms View Post
I've run datalogs many times before and everything looked very much fine, knock was -1 or -1.5 MAX and only for 100 rpm or so ... so fast forward a few months, I got my 60k service at forman performance in orange county [for those of you who know].

I also got my spark plugs replaced with the 60k. he asked if I wanted the standard plus or 1 step colder plugs. I told him standard would be fine, but he recommended 1 step colder ... I questioned it since I only have stage 2 - [cobb sf intake, tomei ti exhaust and accessport on the base stage 2 91 ACN map].

after the service, everything seem like it ran great ... until very recently, my car seems like it sputters around 5-6k rpms when I'm on it hard ... it felt wrong, so I did a datalog and holy ****, the knock is crazy ...

anyone have suggestions ??

pic:

http://img855.imageshack.us/img855/3249/knockj.png
Personally I'd check your plugs. If they look ok I'd reset the pcm and do a very short run in that rpm range. Then shut the car down asap. You can see if the car is actually knocking by reading the plugs immediately after.

If it's false knock sometimes you can get it to knock in idle. But reading the plugs is important. That kind of kr will decimate your engine. But usually that kind of knock is one of two things. An already blown motor or false knock.

Not sure what the max retard is in your tune but that's close.

Just be careful whatever you do.
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Old 05-01-2013, 06:01 PM   #3
Bamofo
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Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:
07 STI Limited
TurboMike Tuned 2.35

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Turn on per cylinder misfire and the stuff you had in the picture and drive around. I've seen people break the clips on the coil packs causing it to misfire... Also might have cracked a plug.. Easy enough to do... Then take a picture.. If it's one cylinder at least you know where to start looking.
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Old 05-05-2013, 08:33 PM   #4
BlazeRex
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Member#: 268354
Join Date: Dec 2010
Chapter/Region: NESIC
Location: Massachusetts
Vehicle:
02 WRX 05 LGT
Slow Automatics

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True, When the coil clips break, they can make the car misfire intermittently due to the poor connection.
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