Quote:
Originally Posted by itschris
You seem confident, so I'd trust your timing.
I'm still stuck on the vacuum leak theory. When in injection mode 1 (PI), LTFT + STFT hits 23ish. The car switches over to injection mode 2 (DI), LTFT and STFT is zeroed and climbs back to 22ish. Since those values are the same and open loop runs lean, I think the fuel side of the afr is likely correct and there's just too much air. If something was off with your fueling I think I'd expect to see a mismatch between fuel trims for each injection mode.
I would probably retest for leaks with brake clean. I haven't tried propane but that stuff is pretty dense. I imagine you'd have to literally touch the hose/nozzle to the leak to see any effect. Failing that, I'd test for leaks with smoke. Mostly to rule out the chance that you're forgetting to check somewhere.
Edit: I missed your post saying it runs with the MAF unplugged. I would double check your upstream O2 sensor is seated, and if it is try a new one
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I am 100% certain it is not a vacuum leak now. I did a smoke test twice and i could not hear air escaping or see any smoke. I did, however, pull one of the evap lines under the intake manifold to simulate if the smoke would actually be visible from a hard-to-reach area. yes, i could see the smoke coming out from under the intake.
I will look at the upstream o2 sensor tomorrow.
Quote:
Originally Posted by Dzmitry
The car definitely sounds like it's running good ones it is running on its own. The odd sounds you're hearing sound quite normal. Pressures can only be determined or specified by your engine builder (IAG). But as mentioned, it seems fine and nothing to worry about at the temps you describe. I would only worry if pressures were VERY different at such a temp, like below 10 psi or above 60 or something maybe. Even still, you would want to verify with IAG what the correct pressure specifications are. They should have this information or at least provide you with some guide.
I have no experience with the level of skill involved in the work you're doing, but with how hard you've been working to find a vacuum leak, I'm still wondering if there's something wrong on the fueling side. Fuel pump has some issues?? Any sensors on the fueling side? The MAF seems to be reading good values, but your STFT is bumpy. At least when it stabilizes. Obviously, prior to that it's not even getting readings, which at this point I have come to admit that it should not be that way (at least not for anywhere near that long).
This definitely seems to be where the issue lies, almost guaranteed. I mean the car struggles and can't idle while the logs are showing no data for STFT/LTFT, while everything else is in order. Then when you stabilize the vehicle and things are running, STFT could still be better and hops around a bit, probably more than it should.
I think if you had a vacuum leak, your problem would be slightly different, and we would see crazier MAF readings or crappy AFR even when you do get it idling on its own. If the AFR was bad enough that it wouldn't want to idle on the initial start, why would it all of a sudden fix itself a bit and start idling pretty decent after you stabilize it? A vacuum leak usually indicates consistent AFR problems. Or if the car can't idle from the start, I don't see how it would adjust itself enough to idle later.
Just the thoughts flowing through my mind...
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I couldn't get a hold of IAG until recently. They said that a safe zone for oil pressure would be 10psi per 1k rpm and mentioned my 19-20psi at operating temps are fine.
So the issue does remain. I am starting to think it is my fueling system as well. I forgot to mention that my car sat for 4 months with E85 til I drained most of it out and flushed it with 91. Not only that, but I am running 100 octane right now though.
I went forward in reving the engine rpm at idle around 2k-3k to help with ring seating against the cylinder walls.
https://datazap.me/u/jrhudson/some-b...-8-10-25-34-35
1st one is from start up. My LTFT was around ~ 14-20%. It does still seem high. Engine sounds normal except for this weird knocking sound. I hear only on the high pressure fuel pump side. I don't hear it on the passenger side(RH). or is this normal and it's just i haven't heard this engine in 6 months.
Fuel system status 4 is when the HPFP is on, correct?
No oil leaks( so far)
I remember during the data logging when i fired up the car that cylinder 3 and 4 were misfiring, but only at start up. It wouldn't misfire for those cylinders every time, but sometimes cylinder 2 would misfire at startup. Every time a cylinder would misfire, it would only be once on the log, though. Maybe a weak spark/coil packs could cause this?
But I'm leaning toward the fuel pump issue since the AEM 340 pump I have has been sitting in that old fuel. I might switch to the walbro unit if my AEM one is mucked up from the old E85. I have purchased a new fuel filter I'll pull out the fuel assembly tomorrow and i also got a fuel injector tester/cleaner for the stock port injectors im using that were sitting for more than a year.
Quote:
Originally Posted by itschris
Fuel trims still seem high to me at around +20 combined. If you're positive there's no leaks it'll be sorted out when you get tuned.
I don't think it's a normal characteristic of a new build, but you could double check and ask in the datalog thread.
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No you're right. even when i put apply some revs around 2-3k the LTFT would get a little better but still above +/- 10%.
Everything is seemingly fine mechanically wise. Other than the knocking sound from the video above. but I am waiting on my turbo kit. I wasn't planning on doing any real driving until i get my turbo kit installed as well. but i would like it to start up fine and no be running lean like it is.