Use of O2 R/L tables in 6E MAF systems After re-reading the stickies on the 730 O2 constants and RBob's ECM Proportional Control from '02 (awesome write up dude!) I am still plagued by a delima on my 6E MAF system. To bring you up to speed here... You can look at my sig but it's an aluminum headed L98 with a mild cam (212/218) HSR intake etc. I am using TunerPro v5 and have an Innovate WBO2 gauge with the WB output in my data logs. I am working with the expectation that my WB readings are correct at idle. Stoich AFR is set @ 14.7 and I am running 10% alcohol fuel. I have been adjusting my O2 R/L mean, upper and lower tables to bring my idle AFR to ~14.7 to 15. Currently my mean O2 R/L is 635 at idle with upper/lower +/-35. 14.7 on the WB gauge is where my engine pulls the most vacuum @ 16hg. Idle speed is 650. I have been able to get the idle AFR perfect when up to full temp and BLM's are 128ish. After idling for about 4-5 minutes the BLM's start to drop to 118 and AFR jumps up to <16. It seems to stablize there but vac drops to 15hg and it runs less smoothly. My question is "Why does the ecm start pulling fuel after idling for a while?" I suspect it is somewhere in my other settings like the reduction gains or filters but can't seem to get a handle on it. My gut call is that something is getting into a runaway situation mathmatically. Any suggestions on what to adjust will be greatly appreciated. BTW I have deleted my EGR and AIR and have made the necessary changes in the bin. |
Re: Use of O2 R/L tables in 6E MAF systems Check the O2 signal, that is what the ECM will follow. I like to graph it along with RPM to get a better idea of what it is doing. When an O2 sensor cools off it tends to report lean, which forces the BLM high. A silicone poisoned sensor reports rich driving the BLM down. With the headers need to use a heated O2 sensor. If the tip of the sensor has a white almost fluffy substance on it that is silicone. RBob. |
Re: Use of O2 R/L tables in 6E MAF systems
Originally Posted by RBob
(Post 5384674)
Check the O2 signal, that is what the ECM will follow. I like to graph it along with RPM to get a better idea of what it is doing. When an O2 sensor cools off it tends to report lean, which forces the BLM high. A silicone poisoned sensor reports rich driving the BLM down. With the headers need to use a heated O2 sensor. If the tip of the sensor has a white almost fluffy substance on it that is silicone. RBob. |
Re: Use of O2 R/L tables in 6E MAF systems Antman, ever figure out what was the problem here? |
Re: Use of O2 R/L tables in 6E MAF systems
Originally Posted by Keoman
(Post 5899745)
Antman, ever figure out what was the problem here? |
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