|
|
|
|
Thread Tools | Display Modes |
10-28-2020, 10:16 PM | #1 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
Closed Deck/Speed Density - Misfire
Hello my friends. Hoping you guys might have some ideas or direction.
Brand new closed deck, 1400+ miles. Just switched to speed density and new tune of course. I am now getting misfire codes...(never had these codes before this SD setup) Latest being P0000 P0300 P0302. Previously, had misfire codes as well as exhaust cam codes. I reset the first time and drove car with no additional codes. Care drove strong. 2 days later, I received the codes listed above. I reset again and drove and car drove strong. Both times was shortly after startup. I noticed that cold startup on both occasions was really rough and then smoothed out. Codes came on during the short low speed drive out of development. Both times, I pulled over a short time after to reset and never saw the codes during those drives. Any thoughts??? Thanks All!
* Registered users of the site do not see these ads.
|
10-28-2020, 11:10 PM | #2 |
Scooby Specialist
Member#: 191967
Join Date: Oct 2008
Location: Vancouver
Vehicle:2005 EVO VIII open source tuning subaru |
What cams and are you still running avcs?
|
10-29-2020, 12:32 AM | #3 |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
|
10-29-2020, 10:20 AM | #4 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
What else has changed? Bigger injectors? Were the injectors cleaned while the engine was apart?
New spark plugs? What are they gapped to? Speed density isn't > MAF based necessarily. When I switched to SD, I noticed misfires as well. |
10-29-2020, 10:55 AM | #5 | |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
Quote:
Nothing. New plugs with new block. Same injectors ive been using with previous block (about a year old) You noticed misfires? So you still "notice" them or was it resolved? |
|
10-29-2020, 11:17 AM | #6 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
so what I would do is if you can go back to the stock tune run that for a while if the misfires are tune dependant than you know whats causing it. if not i would look into the coils
|
10-29-2020, 11:24 AM | #7 | |
Scooby Newbie
Member#: 479543
Join Date: Dec 2017
Vehicle:2015 WRX STI |
Quote:
So go back to MAF tune? As stated, no misfires before SD setup. SD=bad coils??? FYI - For now this appears to be a cold start issue. Idle hunt is terrible during warm up. Codes appear shortly after. Not sure if this helps those who might know or have experienced this issue. |
|
10-29-2020, 12:29 PM | #8 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
My cold starts on e85 are pretty bad. 1 of every 4 times I start it, the car stumbles for about 30s but eventually picks back up fine. What IAT / MAP sensor did you end up going with? Barring that, I'd ask your tuner what's going on. |
|
Thread Tools | |
Display Modes | |
|
|