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Cleaning throttle bodies

I cleaned my tbs off the manifold when I installed the m370. Had no issues after.

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Old 06-20-2013, 01:31 AM   #16 (permalink)
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I cleaned my tbs off the manifold when I installed the m370. Had no issues after.
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Old 06-20-2013, 02:57 AM   #17 (permalink)
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Originally Posted by 370Z JT View Post
I cleaned my tbs off the manifold when I installed the m370. Had no issues after.
You took them completely off the car?
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Old 06-20-2013, 03:15 PM   #18 (permalink)
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He had to, yes. The M370 doesn't come with new throttle bodies. You take them off the old manifold and put them on the new. I went back and forth like 4 times
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Old 06-21-2013, 12:37 AM   #19 (permalink)
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Has anyone deleted the hose on the intake tube? How dirty does that hose get vs the hose going from the PCV to the manifold?
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Old 06-21-2013, 08:26 AM   #20 (permalink)
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You mean the baffled hoses that go from the valve covers to the intake tubes just a bit before the throttle bodies? Those are the fresh-air breathers for the crank-case, you need them to exist in some form or other.
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Old 06-22-2013, 12:07 AM   #21 (permalink)
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So is everyone in agreement that the relearn has to be done after cleaning these?
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Old 06-22-2013, 02:19 AM   #22 (permalink)
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I doubt it *needs* to be done. The air volume and flow rate is only being changed by a tiny percentage by cleaning them. It doesn't hurt, though.
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Old 06-22-2013, 09:20 AM   #23 (permalink)
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It needs to be done if you disconnected the wires that are connected to it.
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Old 06-23-2013, 01:27 AM   #24 (permalink)
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Did this today. Car has 20k miles on it and the throttle bodies were filthy. Did the resets and everything seems to be ok.
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Old 06-23-2013, 06:57 PM   #25 (permalink)
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Did this today. Car has 20k miles on it and the throttle bodies were filthy. Did the resets and everything seems to be ok.
Really. How dirty is the hose going to the intake tubes? I take you don't have a catch can.
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Old 06-23-2013, 07:14 PM   #26 (permalink)
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No catch cans. The tubes going from the intakes weren't dirty at all.
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Old 06-23-2013, 08:00 PM   #27 (permalink)
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No catch cans. The tubes going from the intakes weren't dirty at all.
Hmm. So those tubes must suck since theyre attached to the manifold in a away but so are the TB. Surprised blow by backs up that much to dirty the TB. If you get a CC you won't have to deal with that anymore.
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Old 06-24-2013, 01:52 PM   #28 (permalink)
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The PCV tubes that go from the head covers to the intake tubes (just in front of the TBs) are fresh air breathers that normally flow into the crankcase, not out into the intake tract. There can be odd reverse pressure conditions and/or backfires through them, but they also have some baffling to reduce that. Most of the fouling comes straight up out of the intake manifold itself.
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Old 06-24-2013, 04:51 PM   #29 (permalink)
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The PCV tubes that go from the head covers to the intake tubes (just in front of the TBs) are fresh air breathers that normally flow into the crankcase, not out into the intake tract. There can be odd reverse pressure conditions and/or backfires through them, but they also have some baffling to reduce that. Most of the fouling comes straight up out of the intake manifold itself.
Well they cant be pcv tubes since those are the hoses attached to the pcv going to the manifold. I at least wouldn't call them that. Anywho how would they flow into the crank case when the hose is attached to the intake tube? The intake tube is a giant vacuum cleaner sucking air out of those hoses. The intake sucks, it doesn't blow. Only way to over come the intakes vacuum is to have those lines going to the manifold which they do through all the hose work, valve covers, PCV etc. The manifold sucks air through the crank through all those lines. It's just more powerful than the TB's suction.

Hmmm I'd have to doubt that a little. Blow by coming up from the piston rings, out the valves, and into the manifold seems a little far fetched with a system that brings air in, not out. Since I've seen so much oil in the PCV hoses I'm going to say most of the fouling comes from them, not straight up and out the manifold.
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Old 06-24-2013, 08:45 PM   #30 (permalink)
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They are, in fact, PCV-related. The PCV system has two lines (per side of the engine in our case). There's a vacuum line that goes from the intake manifold to the crankcase, which puts negative pressure on the crankcase and sucks out crankcase fumes via engine vacuum. That's the one you typically put a catch can on to get most of the nasty stuff. Then there's another line which is fresh air delivery to replace what that line sucks out. It's the fatter, baffled stock hose that attaches to the side of the main air intake tube.
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Last edited by wstar; 06-24-2013 at 09:33 PM.
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