? about 2000RPM lean surge
? about 2000RPM lean surge I've got my VE pretty much mapped out, but I'm noticing a lean surge right at 2000 RPMs in 1/2/3 gear under light load (35-40kPa or 24-27 g/sec). WB shows 21 AFR at this point. BTW, this is CLSD. So far I've been pushing the VE up in these cells, but I don't think this is the right way to approach it.
Oh, and I moved the RPM limits for the FTCs so FTC 6 covers 1401-2500.
Any ideas?
Oh, and I moved the RPM limits for the FTCs so FTC 6 covers 1401-2500.
Any ideas?
Did some more sleuthing, the lean surge happens in open and closed loop, with the MAF on or tuned out.
Is there anything mechanical that occurs around 2K RPM, engine wise?
Is there anything mechanical that occurs around 2K RPM, engine wise?
Nothing mechanical that I know of, but I have the same bucking at 1600-1800. Low rpm, low load bucking. Seems to be par for the course. Sometimes it will buck sometimes it wont. I cant figure out the rhyme or reason to it, so I cant figure out how to tune it out. So far my open loop MAF tune has lessened the bucking as much as possible, but its still there a bit. I dont know why youre seeing 21 a/f are you sure youre not going into DFCO? Thats the only time I go that lean.
Originally Posted by Joel_SS
Did you ever figure this out? I am getting the same problem right around 2k. I am pretty sure I have an intake leak though..
If you look at the pic of my O2s (a few posts up), it's only on the passenger side. I've changed the intake gaskets and still have it. Not sure what else would let air in to one side of the engine only. Guess I'll look at injector O-rings next.
I've seen another vette with the same issue, so I'm wondering if there's anything mechanical or otherwise that would cause this.
Are you by any chance dealing with a lazy O2 or using the LC1 to simulate a NBO2? You're getting some huge swings in your trims and/or some lazy activity from Bank 2. Bank 1 looks somewhat normal...
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Originally Posted by SSpdDmon
Are you by any chance dealing with a lazy O2 or using the LC1 to simulate a NBO2? You're getting some huge swings in your trims and/or some lazy activity from Bank 2. Bank 1 looks somewhat normal...
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