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Weird ethanol content reading

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16 replies to this topic

#1
BOOSTIN-B

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So, Visconti FF kit about 4 months old.

Car starts sometimes and the ethanol reading says super low , in the mid 20's when the content is in the high 60's or low 70's

After about 1 minute it gets the correct E content and all is well from then on.
Anyone had this issue. Doesn't happen all the time just very random.

Thanks

#2
NickTO

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Try jiggle the fuel line hose barbs on either side of the sensor with your fingers (not hard) and see if that makes the reading jump.

 

Otherwise make sure connectors are seated properly.


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#3
ThatOtherGTR

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Is this only when the car is heatsoaked and has been shut off for a little while? Possibly the ethanol in the return is boiling if it gets too hot?

Mine does this. It's a gotboost kit. It has only done it for the last few months. I am on cobb and it possible it is also a code issue or sensor issue.

#4
NickTO

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Is this only when the car is heatsoaked and has been shut off for a little while? Possibly the ethanol in the return is boiling if it gets too hot?

Mine does this. It's a gotboost kit. It has only done it for the last few months. I am on cobb and it possible it is also a code issue or sensor issue.

 

If you get heatsoaked and the ethanol reaches near flash point, the GotBoost kit would blink the LED rapidly while the temp is high.  Do you get that happening?


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#5
BOOSTIN-B

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This is cold or hot. Doesn't have a pattern there.

It super hard to try to move the lines because when you get in the car you don't know if it's going to do it or not and by the time it's done it you can't get under the hood fast enough.

Seem like a sensor failure to me. Hopefully Visconti will chime in on this

#6
Ian201

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If your running EcuTek you can also check the content on the coolant temp gauge before starting and compare. 



#7
7racer

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interesting...


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#8
BOOSTIN-B

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On Cobb.

#9
haul s

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How about letting the fuel pump run for a few seconds before starting the car to flush the lines and sensor with fresh fuel?

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#10
ThatOtherGTR

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If you get heatsoaked and the ethanol reaches near flash point, the GotBoost kit would blink the LED rapidly while the temp is high. Do you get that happening?

Not that I can recall. Maybe once or twice, but not every time it happens. But fuel pressure is fine according to cobb. I don't have an issue with pressure dropping after I shut off, at least not for a long while. I just assumed it was because of that. It's always in the 25-50 minute time frame after shutdown. Immediate restart never fails and over an hour after shutoff never fails.

Though I do see the ethanol content fluctuate sometimes when it happens. But it seems to do it sometimes on a perfect start also. This led me to adjust some of the new cobb features to keep ethanol content stable while cranking. And it still fluctuates occasionally according to cobb.

Edited by ThatOtherGTR, 27 November 2015 - 05:58 PM.


#11
ThatOtherGTR

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This is cold or hot. Doesn't have a pattern there.

It super hard to try to move the lines because when you get in the car you don't know if it's going to do it or not and by the time it's done it you can't get under the hood fast enough.

Seem like a sensor failure to me. Hopefully Visconti will chime in on this


Do you have your fuel pumps hardwired? What pump setup, etc.?

#12
ThatOtherGTR

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Also, sometimes I know it's going to do it (25-50 minutes time frame after shutdown), so I attempt to prime the pumps first...and I get nothing. Not always, but occasionally I don't hear anything when I prime the pumps. Almost as if cobb glitches out on the priming part. The pumps are good and the wiring is all good and solid.

#13
BOOSTIN-B

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Fuel pumps are hard wired Dual 450 walbros
My fuel pressure reads normal during this period as well

#14
haseeb

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So what was the actual problem ??
Happening same with my car as well ..

#15
mikeydiker

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If your running EcuTek you can also check the content on the coolant temp gauge before starting and compare.


How do you do that?

#16
Tim

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This should help ya

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post-273-0-31146100-1438786356.jpg

#17
240Z TwinTurbo

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If the flow through the ethanol sensor is low then it will provide a low reading.  You can place it after the fuel rail and before the fuel pressure regulator to see if this corrects the issue.  I placed mine away from the heat as some have suggested being over the exhaust affects the sensor performance.

 

 

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