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Old 02-24-2018, 11:40 PM   #1
Joshfish9182
Scooby Newbie
 
Member#: 454564
Join Date: Sep 2016
Chapter/Region: NESIC
Location: Massachusetts
Vehicle:
2004 Impreza WRX
Urban Grey Metallic

Default BAD knock and IAM drop for seemingly no reason (with logs)

Was out logging some pulls and just as I was about to pull into my driveway I looked over and saw my IAM was 10 and min was 8. It seems like it happened for absolutely no reason, as I logged basically the same conditions a couple minutes before (WOT 5th gear starting at 2k RPM) and nothing showed up.

No Knock:
https://docs.google.com/spreadsheets...it?usp=sharing

Knock:
https://docs.google.com/spreadsheets...it?usp=sharing

I searched for a little bit but couldn't find much other than the usual try some octane booster, check for vacuum leaks, check your '84 dodge coronet's distributor cap, etc. The car is mechanically sound, 04 WRX with 136k, up to date on service, running great. Catless UP+DP, Silicone Turbo inlet+IC hoses, Walbro 255, 8mm Phenolic Spacers, tuned to 16PSI, grounding mod couple extra turns on the WG arm and 5, maybe 6 stickers. Before these pulls I filled up from the busiest gas station in town (Mobil), had Shell in there before, always use 93.

On Thursday, basically the same thing happened. Reflashed before leaving, IAM up to 16 then down to 15 after a spirited merge, so I stopped and changed timing a bit, go going again and this time it went down to 10 I believe during a 5th gear pull but I'm not too sure. That time I figured it was either bad gas or spark plugs, so I changed the spark plugs(OE) and put in octane booster and it seemed to be fixed. Chances I got bad gas 2x in a row? Thanks for the read and any input is helpful, have a good one!
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Old 02-25-2018, 07:22 PM   #2
03WRX-WRB
Scooby Specialist
 
Member#: 167879
Join Date: Dec 2007
Chapter/Region: South East
Location: Lancaster, sc
Vehicle:
2013 Xv Crosstrek
Tangerine orange pearl

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Quote:
Originally Posted by Joshfish9182 View Post
Was out logging some pulls and just as I was about to pull into my driveway I looked over and saw my IAM was 10 and min was 8. It seems like it happened for absolutely no reason, as I logged basically the same conditions a couple minutes before (WOT 5th gear starting at 2k RPM) and nothing showed up.

No Knock:
https://docs.google.com/spreadsheets...it?usp=sharing

Knock:
https://docs.google.com/spreadsheets...it?usp=sharing

I searched for a little bit but couldn't find much other than the usual try some octane booster, check for vacuum leaks, check your '84 dodge coronet's distributor cap, etc. The car is mechanically sound, 04 WRX with 136k, up to date on service, running great. Catless UP+DP, Silicone Turbo inlet+IC hoses, Walbro 255, 8mm Phenolic Spacers, tuned to 16PSI, grounding mod couple extra turns on the WG arm and 5, maybe 6 stickers. Before these pulls I filled up from the busiest gas station in town (Mobil), had Shell in there before, always use 93.

On Thursday, basically the same thing happened. Reflashed before leaving, IAM up to 16 then down to 15 after a spirited merge, so I stopped and changed timing a bit, go going again and this time it went down to 10 I believe during a 5th gear pull but I'm not too sure. That time I figured it was either bad gas or spark plugs, so I changed the spark plugs(OE) and put in octane booster and it seemed to be fixed. Chances I got bad gas 2x in a row? Thanks for the read and any input is helpful, have a good one!
Do you have wideband o2? You didn't log any timing or wideband input to see if you're running lean or to rich. It would help to see those numbers. Also target fuel. Could you send me a copy of your rom? I can look at it tomorrow.
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