90gmcsierraL59
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The gauges, associated wiring and sensor stuff.
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All my u-joints have electrical tape wrapped around them for this reason. Makes it easy.Nice, I used a long extension and a u-joint with masking tape to hold it at the exact angle it needed to be.
The LS engine prior to ~2006 used an actual ethanol sensor installed in the fuel rail. The PCM has tables in it to adjust the AFR and timing depending on the detected ethanol content of the fuel. Most 87 octane in the US is ~10% ethanol, which drops the Stoich fuel ratio from 14.7 to ~14.1:1. Because ethanol burns at a different speed and is more resistant to detonation, it can handle more timing. If the PCM thinks there is more ethanol percentage than it actually has, the engine will knock like the police serving a warrant and it will pull a ton of timing out. My 2011 flex fuel suburban uses a virtual ethanol percentage calculation and somehow it got all screwed up. The PCM was thinking I had ~60% ethanol in 87 octane regular gas and it was making it run terrible. I ended up just disabling the flex fuel in the tune because we only have a single E87 station in the entire state and it is a 1-1/2 hour drive away from me.We are doing an 87 octane tune. We have the whole engine harness for the engine. I assume from what you are saying we would have to buy another sensor to switch back and forth? I thought that these engines run on either?