Mattsuchyna Posted March 1, 2019 Share Posted March 1, 2019 I know many people have the issue where their accessport for their Subaru Legacy GT reboots it flickers when you go WOT and you can’t do a full datalog. Cobb will tell you it’s your ground or your alternator that is bad. After a couple years a research I finally figured out the issue. The issue is the spark plugs used. I was on the phone with NGK for awhile trying to figure it out and we started talking about the resistors in them. Subaru stock plugs NGK 7913 or SILFR6A and have a 5k Ohm resistor in it which can cause a noise interference for the accessport causing it to shut off. After talking to NGK we found a set of plugs that matched every spec on the stock plugs but the only difference was they have a 10k Ohm resistor. The plug is NGK 4212 or ILFR6G-E. I put them in my car for the past week and have went WOT multiple times with no issues and the accessport screen did not flicker or reboot. These plugs have fixed the issue with the accessport Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 1, 2019 Author Share Posted March 1, 2019 Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Deaus Posted March 1, 2019 Share Posted March 1, 2019 Interesting, Thanks for the post. Im sure this will stop people from pulling their hair out trying to figure it out. Link to comment Share on other sites More sharing options...
Code Posted March 1, 2019 Share Posted March 1, 2019 I’ve tried everything to fix my logging issue. I will try this when I return to the garage next month. "Striving to better, oft we mar what's well." - Bill Shakespeare - car modder Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 2, 2019 Author Share Posted March 2, 2019 I’ve tried everything to fix my logging issue. I will try this when I return to the garage next month. Let me know how it goes for you! Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Max Capacity Posted March 2, 2019 Share Posted March 2, 2019 (edited) If this works well. it should be added to JmP's sticky at the top of the 4th Gen forum about various parts. Nice that you thought to call NGK. They have a great customer service and tech dept. I've talked t back in the day. Edited March 2, 2019 by Max Capacity 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
08SpecB_DE Posted March 9, 2019 Share Posted March 9, 2019 I thought it was my foot bumping into the obd connector! I do know it gets fuzzy with the slightest tap. Link to comment Share on other sites More sharing options...
hadvw Posted March 9, 2019 Share Posted March 9, 2019 Would this also fix logging with RomRaider/VAG-COM cutting out under WOT? Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 11, 2019 Author Share Posted March 11, 2019 Would this also fix logging with RomRaider/VAG-COM cutting out under WOT? I believe so because when I was getting an open source tune mine would cut out under boost. It’s an issue with the resistors interfering with the obd2 wires and causing it to send the wrong amount of power. It should fix the issue! And the best way to change the spark plugs is taking out the motor mounts and jacking the motor up about 2 inches and it makes it so much easier! Best of luck with it all Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 11, 2019 Author Share Posted March 11, 2019 I thought it was my foot bumping into the obd connector! I do know it gets fuzzy with the slightest tap. That’s what I was always told my issue was but my cord is where my foot isn’t but Cobb kept saying it was my foot Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
rhino6303 Posted March 11, 2019 Share Posted March 11, 2019 Good find. I wonder if there is an equivalent plug that is in the 7 heat range. Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 13, 2019 Author Share Posted March 13, 2019 Good find. I wonder if there is an equivalent plug that is in the 7 heat range. They don’t have it in a 7 for one step colder. Just talked to ngk and they only have them in 5k Ohm plugs Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
hadvw Posted March 13, 2019 Share Posted March 13, 2019 Ordered! Thanks! Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 14, 2019 Author Share Posted March 14, 2019 Ordered! Thanks! Let me know how it all works out for you! Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
m sprank Posted March 14, 2019 Share Posted March 14, 2019 Someone should measure spark strength against factory. Also consider the effects of the coil pack seeing twice the resistance. I suspect coil issues could result. Twice the resistance makes me go, hmmm... I would lose sleep just throwing them in. Link to comment Share on other sites More sharing options...
bergs Posted March 14, 2019 Share Posted March 14, 2019 Good find. I wonder if there is an equivalent plug that is in the 7 heat range. I installed LFR7AIX and have not yet seen an issue on my AP. Granted, I haven't done any real pulls other than through 1st and 2nd gear as my engine has only a couple hundred miles on it. Still, I wanted to report no issues seen at WOT using those particular plugs. Link to comment Share on other sites More sharing options...
rhino6303 Posted March 14, 2019 Share Posted March 14, 2019 I installed LFR7AIX and have not yet seen an issue on my AP. Granted, I haven't done any real pulls other than through 1st and 2nd gear as my engine has only a couple hundred miles on it. Still, I wanted to report no issues seen at WOT using those particular plugs.Thanks. I use SILFRA7 (5245) and don't have issues either but if I ever did it would be nice to have an option. Link to comment Share on other sites More sharing options...
Mattsuchyna Posted March 15, 2019 Author Share Posted March 15, 2019 Someone should measure spark strength against factory. Also consider the effects of the coil pack seeing twice the resistance. I suspect coil issues could result. Twice the resistance makes me go, hmmm... I would lose sleep just throwing them in. I talked to ngk for awhile on the phone and they said there will be no issue with the spark because of the difference in the resistance. The spark is the same it just makes less “noise” with the resistors. I’ve had them in my car for awhile now and no issues. I wouldn’t lose any sleep over it. It doesn’t make any difference with the different resistors excepting fixing the resetting issues. The spark strength is almost exactly the same. Ngk said there was no difference Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
m sprank Posted March 15, 2019 Share Posted March 15, 2019 I talked to ngk for awhile on the phone and they said there will be no issue with the spark because of the difference in the resistance. The spark is the same it just makes less “noise” with the resistors. I’ve had them in my car for awhile now and no issues. I wouldn’t lose any sleep over it. It doesn’t make any difference with the different resistors excepting fixing the resetting issues. The spark strength is almost exactly the same. Ngk said there was no difference Sent from my iPhone using Tapatalk I dont give an F what some customer service lacky said to sell a set of plugs. I would test myself. Just my 2 cents. Link to comment Share on other sites More sharing options...
ashwinearl Posted February 19, 2020 Share Posted February 19, 2020 (edited) I have the Accessport V2 and have had the flicker problem at WOT with stock plugs . In my current setup, I am trying these NGK 4212 plugs. The AP screen is still flickering black/white at WOT, but in looking at the logs, it looks like the data is still there. In the past, it would just stop logging. Edited February 20, 2020 by ashwinearl Link to comment Share on other sites More sharing options...
bergs Posted February 24, 2020 Share Posted February 24, 2020 I've put roughly 20,000 miles on my car since I last posted in this thread and am pleased to report there have been zero issues with my AP and the NGK LFR7AIX plugs that are currently installed. Link to comment Share on other sites More sharing options...
NORULZleggy Posted February 24, 2020 Share Posted February 24, 2020 Here is an easy fix, just stop keeping your AP hooked all THE DAMN TIME. Drive me nuts to see people running around with it hooked up. Out of all my cars I can tell you I have only used the AP 10 times over way to many years. most were to have the car dyno tuned or up load a map. I have very nice gauges to tell me what's up. I also have a nice big OBD2 scanner that does live data on screen. My Ap stays in the glove box always. Link to comment Share on other sites More sharing options...
bergs Posted February 25, 2020 Share Posted February 25, 2020 For a guy like me, I don't have all the time in the world to immerse myself in what appropriate sensor readings look like so it's a whole lot easier for me to monitor certain values and ask a question on the forum or perhaps capture a few logs to post to the forum so more experienced people can provide feedback...like in the case of my failed front O2 sensor. I am personally not a big fan of gauges so the AP is the perfect balance of what I need in order to load tunes, monitor sensor performance and post logs if need be. That all said, no, I do not leave it plugged in all the time everywhere. Link to comment Share on other sites More sharing options...
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