April 13th, 2020

#7105: Could that be it?

Jeep did it to me again today. After an entire week of behaving nicely, it acted up again when I was on my way in this morning.

Came home for lunch, and went back to work with it still doing it-- I wanted to diagnose it when I got home after work--but when I got back to work I opened the hood and had a gander and started trying to see if anything was perhaps leaking. Accidentally pulled the PCV valve hose off the manifold and slapped a fingertip over the fitting to keep the engine from racing...and it settled down to a nice idle! With my fingertip completely covering the hose barb end, so that no air got through, the Jeep idled just like it's supposed to.

Well, what do you know? I thought. When did I ever replace the PCV valve, anyway?

Try never. 204,000 miles on it. Yeah.

So I went inside and got back to work, but during a lull I ordered a PCV valve from O'Reilly's and set it for in-store pickup. Went to O'Reilly's to pick it up, having decided to also get the front elbow fitting in case it was clogged, and...found the same part for $6 that I'd paid $13 for.

Bought both of them. Came home and dug in.

Mind you--the Jeep was misbehaving every time I came to a stop, trying to die, etc. I did not touch the computer connectors or the power cables at the battery.

The pipe from the PCV valve to the intake manifold seemed kind of restricted, but the really interesting thing was how the rubber hose bit that held it in the manifold had a split, running about a third of the way up from the bottom. I cleaned the pipe out with MAF cleaner.

The PCV valve--when I tried to blow through it--seemed overly restrictive. But when I blew through the new one (the cheap one) it was just as restrictive. I did an A-B test, one in one hand, one in the other, and they seemed the same, so I put the new one in and left the old one in my toolbox against future need.

Then I cut off the old rubber hose bit--which was brittle with age--and put a brand new piece of hose in its place.

Started the engine and it ran normally.

Without touching the computer.

Now, one of the causes of a bad idle, the web sites said, was a vacuum leak. But to me "vacuum leak" means "HIGH idle" not "crappy low idle" so I disregarded that advice--but it seems to fit pretty well, looked at from this angle.

Especially because of something ELSE that's been going on.

You see, I didn't connect this with anything, and I should have: over the past few months when I let off the gas the engine dropped immediately to idle. Even coasting along at 55 MPH, it would go down to maybe 1500 RPM. And every time it happened, it seemed a little odd to me, like it was just being too quiet.

But with the new PCV valve and that bit of hose? Let your foot off the gas and it no longer does that. I noticed it doing that with my finger over the vacuum port, too. Goose the throttle, let it go, and it would ease down to idle rather than drop suddenly. (Prevents backfiring.)

So, here's the current theory:

Very slight leak at the PCV valve port allowed more air in than the PCV valve did. Normal speed, this isn't a problem, just runs a little bit lean, but at idle the MAP sensor was saying one thing while the IAC valve did another. Computer, seeing too much pressure in the manifold (not enough vacuum), closes the IAC. And when the IAC closes, vacuum increases, and it pulls the pipe down against the seat, only now the engine is idling at 350 RPM. Vacuum is correct so computer assumes that this is the right idle setting.

Resetting the computer puts it into "learn" mode, and so it uses standard values for everything until it gets a handle on what the fine adjustments should be. Once it's learned what those fine adjustments should be, we're back at 350 RPM again.

That's my theory. Here's hoping that's actually what was wrong with the thing, because I'm getting sick of dicking around with it.

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But if it was a vacuum leak where the PVC goes into the intake manifold, then it was an awfully serendipitous discovery--not that I'm complaining.

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Anyway, lets get on with the rest of it so I can play WoW.

"Believe all women" has been replaced by "believe all women who accuse Republicans but not the ones who accuse Democrats".

After you've read that, scroll down. Funny stuff, including a Bernie Sanders supporter who took her student loan money and donated it to Sanders' campaign. "Bernie PROMISED he'd beat the Fucking Cheeto and erase student loan debts." Now she's in trouble because she's not going to be able to pay for her next semester of college, and she'll end up "broke and homeless". Of course she blames "You fucking nationalist greedy fucks" for this.

Um...who put the gun to your head, sweetie, and forced you to write that check to Bernie Sanders? I think you did that all by yourself, and it just demonstrates why the age limit for the franchise should never have been lowered beneath the threshold originally set by the Founding Fathers.

It's pretty funny, actually.

Meanwhile the New York Times "found no pattern of misconduct" by Joe Biden other than the well-known pattern of misconduct that got him nicknamed "Gropey Joe" in some sectors.

And then the mainstream media wonder why an increasing number of people simply do not listen to them any longer.

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This is actually not the first time this has happened, though. Last time Americans tried to change how anime and manga were produced, the Japanese said "LOL GET FUCKED--don't read/watch it if you don't like it."

The thing is, the manga industry in Japan is huge. The total fortunes of DC and Marvel wouldn't begin to touch just one of the major manga publications--and there are tons of them. A lot more than two. Manga is big, big business in Japan; it's not just a niche thing like it is here.

How big? Try ten billion dollars a year. Compare that to the American comics industry which is about one billion dollars, and guess what? That includes translations of manga!

Okay? The Japanese comics industry is ten times the size of the American comics industry. MORE than ten times the size. The Japanese people don't give a rat's ass what American SJW/NPC asshats think about their product, and I have a feeling that this attempt to make the Japanese do what they want is going to fail about the same way it failed the last time they tried it.

Funimation may be able to get some changes made to some things--but I'd bet money that the Japanese won't tolerate too much of that horseshit.

The fans certainly will not. If Funimation is going to bowdlerize anime for American release, it'll mean more piracy as people download the fansubs. If Funimation actually gets the original production to be changed, Japanese fans will riot.

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So this clock is so precise you can tell how high it's been lifted. Relativity: the closer you get to a gravitational singularity, the slower time goes. So at Earth's surface, time runs at rate X. A certain distance above Earth's surface, time runs at rate X+Y (where Y is a very small number). This clock is so precise, it can tell the difference between X and X+Y where the distance it's been lifted is one centimeter.

Dang.

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I like this argument that going to war against the US is very very bad for China. But countering that is the postulate that war is never really declared by rational actors, but people who are acting irrationally to one extent or another.

And the commies are anything but rational, IMHO.

Still, he makes a compelling case.

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As for me, somehow I got through Monday, and I only have four more days this week. Whee!