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-   -   Different scanner. New code (http://www.bimmerfest.com/forums/showthread.php?t=578609)

540indiana 11-01-2011 09:46 AM

Different scanner. New code
 
I had been wondering if different parts stores used different scanners. Autozone is less than a 1/8th of a mile from my house so I would just go there to pull codes. So today I decided to drive down the street to Advance auto parts to get a battery price for my wifes car and asked them if they could pull the codes for me.

They did use a different scanner and the little sob popped up a new code for me

P0340 along with the 171 and 174.

I believe I have found the culprit to the 171/174 issue. The vacuum jet pump behind the motor.

As for the CPS, Could this likely be the intermitent power and torque loss I am experiencing?

edjack 11-01-2011 10:17 AM

You have two CPSs; the right bank CPS is probably failing intermittently, and, if true, will cause a loss of power, at very least, and a stumbling engine, at most. Replace with a BMW-branded CPS.

The two lean codes could be caused by intake leaks, downstream of the MAF. The gasket between the throttle body and the intake manifold has been known to fail.

Don't know what a "vacuum jet pump" is.

540indiana 11-01-2011 10:34 AM

Ed, I apologize It is called a "Sucking Jet Pump" (Part #1) and I am also suspicious of #4 in the diagram.

http://s412.photobucket.com/albums/p...loemvacuum.png

I tried the intake spray trick around the TB and no change in the motor. Unless it is leaking at the bottom of the gasket. I am just going to get a smoke test done and stop with all the guessing.

bluebee 11-01-2011 11:58 AM

Quote:

Originally Posted by 540indiana (Post 6414155)
I believe I have found the culprit to the 171/174 issue. The vacuum jet pump behind the motor.

Quote:

Originally Posted by edjack (Post 6414212)
Don't know what a "vacuum jet pump" is.

Quote:

Originally Posted by 540indiana (Post 6414249)
It is called a "Sucking Jet Pump" (Part #1)

Here is the diagram of my sucking jet pump:
Engine => Vacuum control => Vacuum control - engine

And, here's a picture of mine:
http://www.bimmerfest.com/forums/att...1&d=1319781947

It has three hoses. One is shown removed here on my M54 which goes from the F connector to the sucking jet pump.
http://www.bimmerfest.com/forums/att...1&d=1319781945

If you have a simple layperson's explanation for how the sucking jet pump works, I'd be interested in the story.

PS: To the OP: What exactly was the problem you identified?

540indiana 11-01-2011 01:36 PM

Quote:

Originally Posted by bluebee (Post 6414420)
Here is the diagram of my sucking jet pump:
Engine => Vacuum control => Vacuum control - engine

And, here's a picture of mine:
http://www.bimmerfest.com/forums/att...1&d=1319781947

It has three hoses. One is shown removed here on my M54 which goes from the F connector to the sucking jet pump.
http://www.bimmerfest.com/forums/att...1&d=1319781945

If you have a simple layperson's explanation for how the sucking jet pump works, I'd be interested in the story.

PS: To the OP: What exactly was the problem you identified?

Blue, it has not yet been confirmed but I can hear air right at the jet pump and the line I noted in the diagram. Just by giving it a small turn I can hear the noise go away. That is what I am hoping.


As for the function Check out post #4

http://forums.bimmerforums.com/forum....php?t=1346918

edjack 11-01-2011 01:39 PM

Do report back when you resolve this.

540indiana 11-01-2011 01:40 PM

Quote:

Originally Posted by edjack (Post 6414663)
Do report back when you resolve this.

Yes sir :thumbup:

rdl 11-01-2011 06:05 PM

1 Attachment(s)
Quote:

Originally Posted by bluebee (Post 6414420)
Here is the diagram of my sucking jet pump:
If you have a simple layperson's explanation for how the sucking jet pump works, I'd be interested in the story.

PS: To the OP: What exactly was the problem you identified?

I haven't opened mine up (i.e. broken it apart) to confirm but it's almost certainly the same principal as described in attached file, page 12.

Fudman 11-01-2011 07:04 PM

RDL: A very informative .pdf! I've seen BB's posts regarding the sucking jet pump and I had no clue as to what a sucking jet pump was or did. It certainly had a strange name.

It is not a pump at all. It is simply a brake booster that uses intake manifold pressure to boost the master cylinder. When the car is started, the pressure on the intake manifold side of the jet pump is less than the intake boot side, so air flows from the intake boot into the intake manifold. The pump uses the Venturi principle to constrict the flow of air which increases the velocity of the airflow. This in turn creates a vacuum on the brake booster inlet side, which improves braking power. It's just a clever way to scavenge pressure differential to achieve an improvement to braking with no electrical component or parasitic loss.

540indiana 11-01-2011 07:57 PM

I would love to get my hands on a M62 pdf like that

rdl 11-01-2011 08:25 PM

2 Attachment(s)
Quote:

Originally Posted by 540indiana (Post 6415389)
I would love to get my hands on a M62 pdf like that

Like these?

540indiana 11-01-2011 08:31 PM

Quote:

Originally Posted by rdl (Post 6415449)
Like these?

You are DA MAN!!!!:thumbup:

540indiana 11-01-2011 08:33 PM

I would love to have a magical genie to fix my car????

bluebee 11-02-2011 11:26 AM

1 Attachment(s)
Just for those who don't know, there are scores of engine-detail PDFs in the bestlinks ... (many of which are from RDL himself).

I see the M62 is covered ... e.g.,
- BMW Engines All About The M60 And M62.pdf
- BMW_M62_Engine_X5_details.pdf
- BMW Legends_ S62 V8.pdf
etc.

I'll see if the other PDF is there (if not, I'll add it).

Note: This is just a sub selection in one post ...
http://www.bimmerfest.com/forums/att...1&d=1320254469

bluebee 11-08-2011 05:32 PM

Quote:

Originally Posted by 540indiana (Post 6414249)
It is called a "Sucking Jet Pump" (Part #1)

BTW, a reader reported his SJP broke, essentially in half, in this thread today:
- How does the BMW E39 sucking jet pump (aka suction jet pump) work & how does it fail?

http://www.bimmerfest.com/forums/att...1&d=1320797883


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