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Old 09-28-2012, 04:45 PM   #1 (permalink)
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Default Vacuum Tree location?

Hey guys,
I just got a P0171 and 0174 codes yesturday. I took it in to a shop to have the problem pin pointed and they told me it was a vacuum leak at the vacuum tree behind the manifold. I am wondering where it is exactly? Could someone post a picture? They also suggested that I get an intake service done because the throttle plates are dirty. Any one ever hear of that before? Thanks for your help in advance!!

Forgot to mention. I have a 2004 V6 3.0L. Completely stock
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Old 10-01-2012, 03:03 PM   #2 (permalink)
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Remove your IM plenum, replace the gaskets, replace your pcv valve and the hose that feeds it, and clean your TB plate while you have it off. Don't forget to take your battery out first.

While you have it exposed, consider the egr mod in the v6 3.0 stickies.

I did it, and my ride runs like a f*ckin top now.
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Old 11-05-2012, 03:18 AM   #3 (permalink)
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Already did the PCV valve and the hose that feeds that. Haven't done the gaskets and TB plate yet though. I will check out the sticky for sure. When I tore everything apart I found that there is a plastic Y split that comes off the EGR valve and then goes to the air box or somewhere near it and then also goes up to the plenum. Those hoses where completely dried out. Replaced those and haven't got the CEL in a while however I feel a slight jerking every once in a while. I will do the other things that you mentioned. Thanks for the repsonse. I know this response is almost a month later but I have been super busy. Thanks again
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Old 11-05-2012, 02:15 PM   #4 (permalink)
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you went to one dumb ass shop. we don't have a "vacuum tree"

Have any of you replaced this vacuum line?
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Old 11-09-2012, 09:16 PM   #5 (permalink)
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Totally agree I made a mistake in where that Y split is at. It actually comes from the Fuel Pressure Regulator and goes into the air box and up to the plenum. I replaced the Plenum gaskets and cleaned the throttle body. I put the blue gaskets in the plenum that I got from checker orielly's. I think it was a mistake because they stick up about an 1/8 of an inch more than the stock ones. Well, while tightening the plenum I cracked one of the bolt holes... I am now hoping it didn't crack all the way through creating vacuum leak. Car is running like shit. I a getting a lean bank 2 now!!??! I am going to put the old gaskets back in and see if it works. (Cross Fingers) Hope I don't need to replace the plenum!!!

I also did the EGR mod. I can't see that causing a lean bank 2 error that I am getting now.
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Old 11-12-2012, 05:18 AM   #6 (permalink)
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Finaly got it all figured out. Car is running pretty good now. It runs quite a bit different after doing the EGR mod. It seems like it wants to take off all the time??!! I'm not sure if that is how it is supposed to be but I'm not getting a CEL.
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Old 11-12-2012, 11:10 AM   #7 (permalink)
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Take off? like the idle jumps?
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Old 11-12-2012, 08:12 PM   #8 (permalink)
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No..When driving it feels like it wants to keep going faster. I am thinking it may be my throttle body? When I step on the gas everything is fine. If I stop completely the car all of a sudden drops from about 1100 RPM down to about 700. The 700 has been normal for me. When I put the car in drive and my foot off the brake, the RPM's go up to 1500 and bounces back and fourth between 1500 and 1750 with my foot off the gas.
I had taken the throttle body apart and removed the valve plate in the middle. I am not sure that I put it back in the same way. Is it supposed to be closed completely or should there be a small gap between the top and bottom. My gas mileage seems to be a little worse also. I won't know for a little while for sure though. I am not getting any codes or the CEL either.
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Old 11-13-2012, 12:13 PM   #9 (permalink)
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there should be small gap(otherwise the car would die at idle).

sounds like you still have a small air leak.
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Old 11-20-2012, 12:04 AM   #10 (permalink)
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I took everything all the way apart again and during the process I noticed oil in the intake. I replaced the PCV about 6 months ago for that reason and now just did it again. Also ended up replacing the plenum orings/gaskets again. After it was all back together I did the throttle body calibration by turning the key to the on position for about 70 seconds, turned it back off for 30 seconds then started it and let it run for 5 minutes. Now it is fixed. Not sure exactly which one of those things fixed it but either way its running great now. Thanks for the ideas/suggestions guys. Really appreciate it.
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