I recently tuned my sho and saw the knock reading was quite back and it was pulling alot of timing. I thought it was a fuel issue so i changed to a few different gas types. I originally was running 94 octane with 10% ethanol and found i get the worst knock on this gas. both stock and tuned i tried a few 91s and it got a little better but never went away. I went back to stock after this and saw knock go down considerably (1.5-4) instead of (5-6.5). Recently tried the 94 octane stock and see spikes of 6.5 at WOT. I had to go on a long roadtrip and noticed i was having spark blowout on the plugs so i got them replaced at my destination. Im not sure what else to do. Im starting to think its a ton of carbon build up.
Knock with stock tune at WOT.
- Thread starter curry67
- Start date
ecoboostsho
New member
How many miles are on your car? Have fixed your knock sensor wires (there is a how to)? What are you using to measure the knock?
I got it done at ford dealer as it was kinda of a pinch. I'm dropping car off at dealer Tuesday for drivers side blend door, massaging seats, old dark stain on top of ptu. My ac has been acting up but it's not all the time so they probably won't even diagnose that. My battery is also not looking to good and probably needs to be replaced.
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no I'll have to check that out. Never could see the knock before. I'm using a sct x4 with Torrie config file for dataloging. 94000 km so I guess 60 k miles almost . Had all the driveline fluids replaced about 15 k ago. Always used 91+. Did buy the car used though.ecoboostsho said:
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Hope someone can chime in with the differences in datalogging between the SCT X3 and X4, but here is a basic writeup on how to do it with the X3:
http://www.mustangevolution.com/mustang-articles/how-to-data-log-your-vehicle-with-an-sct-x-cal3/
http://www.ecoboostperformanceforum.com/index.php?topic=788.0
A howto for the X4 written by Bama Performance:
https://support.bamaperformance.com/hc/en-us/articles/202545589-How-to-Datalog-with-the-Bama-SCT-X4-SF4
More useful info on their site, if you want to dig deeper.
Fuel trims are commonly abbreviated as STFT (shorttermfueltrim) and LTFT (longtermfueltrim). Bank1 will be STFT1 and bank2 will be STFT2 for instance.
You should get comfy with logging with the X4, but if you can't, I think Forscan on iDevice or Torque Pro on Android is a great way to go. Very easy to use. You WILL need a WiFi OBD adapter with the iDevice (such as the VGATE) or WiFi/Bluetooth adapter with the Android (such as VGATE, OBDLink MX, etc).
Plug gaps need to be changed to 0.030 or 0.028, whatever Torrie recommends. Otherwise you will likely be running too lean for the tune, creating conditions for a knock. You might get away using 94 octane fuel with stock plug gap & 87 tune, but not a 93 tune + stock gap + 94 fuel. Basically you are using higheroctane fuel to fudge for improper plug gap, at best a temporary measure.
http://www.mustangevolution.com/mustang-articles/how-to-data-log-your-vehicle-with-an-sct-x-cal3/
http://www.ecoboostperformanceforum.com/index.php?topic=788.0
A howto for the X4 written by Bama Performance:
https://support.bamaperformance.com/hc/en-us/articles/202545589-How-to-Datalog-with-the-Bama-SCT-X4-SF4
More useful info on their site, if you want to dig deeper.
Fuel trims are commonly abbreviated as STFT (shorttermfueltrim) and LTFT (longtermfueltrim). Bank1 will be STFT1 and bank2 will be STFT2 for instance.
You should get comfy with logging with the X4, but if you can't, I think Forscan on iDevice or Torque Pro on Android is a great way to go. Very easy to use. You WILL need a WiFi OBD adapter with the iDevice (such as the VGATE) or WiFi/Bluetooth adapter with the Android (such as VGATE, OBDLink MX, etc).
Plug gaps need to be changed to 0.030 or 0.028, whatever Torrie recommends. Otherwise you will likely be running too lean for the tune, creating conditions for a knock. You might get away using 94 octane fuel with stock plug gap & 87 tune, but not a 93 tune + stock gap + 94 fuel. Basically you are using higheroctane fuel to fudge for improper plug gap, at best a temporary measure.
glock-coma
New member
I was having kr issues until I started blending a little e85 in with 93. I would definitely check you knock wiring, its right below the tstat housing and is easily cut on the edge of the engine block.
6.5 on wot is no Bueno
6.5 on wot is no Bueno
Agree on the wiring!glock-coma said:
Since adding EtOH to the fuel increases effective octane I think you have to view it as a temporary workaround measure only. I'd recommend fix the problem.... Then if if you want to use an ethanol blend you can tune to take advantage of the higher octane by adding more timing, tune or ECM.
Not sure from the pic. Also, remember that the KR sensor is a microphone, so other loose objects could possibly fool the sensor.... That said it is a quick fix and here's a link to the post with pics:
http://www.ecoboostperformanceforum.com/index.php/topic,554.msg3496.html#msg3496
http://www.ecoboostperformanceforum.com/index.php/topic,554.msg3496.html#msg3496
glock-coma
New member
That looks like them. 4 wires total. 2 for each knock sensor.curry67 said:
are these the wires?
2010 RCM non PP
K&N panel filter with aux hose
RX OCC with CSS
sp534 @ 30
unleashed tune 12.90@106
glock-coma
New member
The black hose with the yellow tape is a vacuum hose I believe. The white and black wires are the ones your looking for. You can see them in the pic. they're covered about 2" down in a rubber sleeve. The exposed part is what your worried about.
I reading about the design of the knock sensor input circuitry,a short to battery,short to ground,or open circuit all result is a low knock signal voltage output,this output voltage is compared to a noise signal threshold (function of engine rpm and load)to determine knock sensor circuit high,circuit low or performance faults,some PCM/ECM modules use a driver circuit that will periodically and actively test the knock sensors lines for short circuit faults,in these modules supplemental codes can be set for the short circuit condition ,some PCM/ECM modules use standalone knock IC,in these modules the knock signal processing chip SPI bus is checked for proper communication between the main processor and the chip used as the interface the knock sensor,would also check for any codes set and monitor the high (knock retard)with obd scanner as SHOdded mentioned above,personaly have the MX obd bluetooth adapter along with torque pro which really comes in handy to monitor your vehicles functions,the above is a brief description of the sensors primary function,due apologize for the lengthy post on this topic just sometimes get in the mood to read and learn more about our vehicles aspects and all and before taking it to our local friendly dealer which most of us hate. Z