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Bad UEGO, bad fuel or something more?

CAPT_BLOTTO

CAPT_BLOTTO

#Crush It
Joined
Jul 19, 2005
Location
Kansas City
77 240 with b230 E85 big turbo LS coils running microsquirt.

I've finished up a wiring project and spent some time checking all my inputs and outputs before starting the car after it has been sitting for months. Car was running fine before it sat. Got the car started, barely, and the AFR is saying it's full lean. Car doesn't sound the best and I can only get it to idle while holding the throttle open. When I let off the throttle it starts popping out the exhaust. The flex sensor is also fluctuating a lot I will look at the ground wire. There might be multiple things going on but I attached the log file of a cold start to get some help on what might be causing it. It has an AEM wideband with the LSU 4.9 wideband. Is there a way to tell if its actually bad?
 

Attachments

First get it to idle without the O2. It should be pretty close if your injector data is correct.

I would not run the flex fuel input until you have it idling first.
 
mopar318 said:
First get it to idle without the O2. It should be pretty close if your injector data is correct.

I would not run the flex fuel input until you have it idling first.
Click to expand...
It doesn't have O2 correction when its warming up.

The tank has some E85 in it because it was running the flex fuel before without issues.
 
I forget the details, but relying on a flex fuel sensor sensor to adjust fueling with MicroSquirt is risky. I think it has a code issue where the % ethanol can glitch, causing the the mixture to go really lean.
 
bobxyz said:
I forget the details, but relying on a flex fuel sensor sensor to adjust fueling with MicroSquirt is risky. I think it has a code issue where the % ethanol can glitch, causing the the mixture to go really lean.
Click to expand...
Is there something else? Or a redundant check or something?
 
Try reading through this thread - nothing was fixed for MS2/MicroSquirt, but the issue has been improved in recent MS3 code.
Q

Thread 'Megasquirt flex fuel tuning E85 with ethanol sensor.'

I am trying to work through a decent flex fuel tune on my daily driver 240. I have done plenty of E85 tunes on red blocks over the years. But on my daily driver car I wanted to experiment with true flex fuel automatic tuning. I bought the sensor and plumbed it into the return fuel line near the fuel rail and wired it up. I get realistic readings from the %ethanol gauge in Tunerstudio. Everything seems to be working OK. I was getting 12% reading on my standard pump gas 91 octane. I have heard and read the signs at gas stations in Colorado that standard fuel blends contain about 10% ethanol...
 
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