[CSARGUNNER]

Alright guys, this is a weird one for me. I've had this issue for a while. I have a DSX E-85 kit installed (came with the car from the previous owner). When I got WOT and at high RPMs, the alcohol content % goes from 64% to 100% randomly. Normal driving it is fine, just happens when at high RPMs. I swapped out the sensor with a new one and that didn't fixt the issue. I checked the connection with that single white wire going into the ECM and that is not loose, I checked the connector that splits off going to the coil pack and that's not loose. I let the car idle while making a scan and I would gently move and wiggle the wires and connections to see if that you cause the alcohol content % to fluxgate and its rock solid. I am at a loss for what this could be. Anyone have any thoughts?

 

[07GTS]

is the sensor in the return line or the feed line ? ive seen those issues when its in the return line and most of the fuel gets used up during a wot or high rpm usage less fuel is returning to be sampled by the sensor

 

[CSARGUNNER]

is the sensor in the return line or the feed line ? ive seen those issues when its in the return line and most of the fuel gets used up during a wot or high rpm usage less fuel is returning to be sampled by the sensor

it’s on the feed line. I have a returnless system.

 

[07GTS]

is it altering the commanded AFR when this happens ? it uses HZ so unless its getting interference from something, does it get its power/earth from the coil pack ? could try a separate power/earth as a test first encase the coils are causing a slight drop thats affecting it and try use a earth that the ecu uses

 

[BlueCoupeV]

Post your tune if you can, if anything is out of whack with power enrichment etc, we will be able to find it for you.

 

[5ft24]

Move the sensor wire as far away from anything ignition or injector wiring related. Noise on that wire will make the percent read like yours. Sensor puts out a frequency between 50 and 150hz. 50 is zero percent, 150 is 100%. Basically any ignition noise or noise from injector wiring gets on the line and it reads max.

 

[Lt1z]

Move the sensor wire as far away from anything ignition or injector wiring related. Noise on that wire will make the percent read like yours. Sensor puts out a frequency between 50 and 150hz. 50 is zero percent, 150 is 100%. Basically any ignition noise or noise from injector wiring gets on the line and it reads max.

I doubt this is the issue

 

[5ft24]

I doubt this is the issue

Ok sparky... Pull your hair out until you find it then