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General E46 Forum
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Old 11-29-2012, 01:39 PM   #1
fernando629
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Join Date: Jun 2012
Location: El Salvador
Posts: 52
My Ride: 325Xi 2001
Help me figure out multiplicative adaptation issue

Hi guys, first car is 2001 325xi, with 77K miles.

I've changed:
Fuel filter
All vacuum hoses
Both intake boots
Air Filter
CCV
Air filter box oring
CAM position sensor exhaust side

Cleaned:
ICV
Throttle body
Valve at SAP, replaced gasket
Resealed DISA

I've been battling codes P0171 and P0174, that seem to have gone away since I replaced my fuel filter. Before I replaced the fuel filter, I would reset my adaptations and the multiplicative adaptations would max out at 12% (both banks) within a day or two, SES would follow.

After replacing my fuel filter, the multiplicative adaptations take more than two weeks to max out at 12% (both banks). I ran with those values for about 2 days, but no longer get codes P0171 or P0174. SES no loger comes one either.


So, I'm not sure if what I looking at is still a vacuum leak, bad MAF, bad O2 sensors or if my pump is failing. I tested preassure at the rail about 2 months ago and it was above 50psi (don't remember the exact number).

Also, I'm getting codes: (from INPA)

65 Cam shaft position sensor (intake side)
Car has shut off about 3 times and this code has shown, error not present when pulled

18 Air mass sensor (is this code for the MAF or also for the CPS sensor?)
Error not present when pulled

What do you guys think?

Last edited by fernando629; 11-29-2012 at 02:09 PM.
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Old 11-29-2012, 05:23 PM   #2
fernando629
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My Ride: 325Xi 2001
No ideas
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Old 11-29-2012, 05:44 PM   #3
E30Gelardi
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Join Date: Apr 2012
Location: Ny
Posts: 11
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Could it be a Vanos issue causing your timing to be off?

Did you smoke test the intake system for leaks to ensure no vacuum leak.

What about a slight exhaust leak tricking the o2 sensors?
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Old 11-29-2012, 05:46 PM   #4
Caden
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Join Date: Feb 2012
Location: Texas
Posts: 328
My Ride: '01 325i
It is possible that your pump is on the way out. That's how it was for my car and then a couple weeks later bam, my pump is dead. When and if you decide to order it, the best place would be bmaparts.com coupon code specE30. I think it's 5 percent off or something. Anyways, good luck man.
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Old 11-29-2012, 05:47 PM   #5
fernando629
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Location: El Salvador
Posts: 52
My Ride: 325Xi 2001
I did a smoke test and found no leaks....makes me think faulty MAF, values at idle are always at around 8

Not sure about the vanos, but don't feel any lack in power
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Old 11-29-2012, 05:49 PM   #6
fernando629
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Quote:
Originally Posted by Caden View Post
It is possible that your pump is on the way out. That's how it was for my car and then a couple weeks later bam, my pump is dead. When and if you decide to order it, the best place would be bmaparts.com coupon code specE30. I think it's 5 percent off or something. Anyways, good luck man.
Thanks will order the pump as PM, just want to make sure if it's something else I order all at once.
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Old 11-29-2012, 07:06 PM   #7
fernando629
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Quote:
Originally Posted by fernando629 View Post
Also, I'm getting codes: (from INPA)

65 Cam shaft position sensor (intake side)
Car has shut off about 3 times and this code has shown, error not present when pulled

18 Air mass sensor (is this code for the MAF or also for the CPS sensor?)
Error not present when pulled
Just got home and hooked up INPA again, I cleared these codes last night and they are back on today.

DIS shows these codes:

65= 41 DME: Signal, camshaft sensor, inlet
No signal (P0344 or P0340)
Fault currently not present

18= 08 DME: Signal, air-mass flow sensor
Short circuit to negative or open circuit (P0102)
Fault currently not present

these aren't related are they?
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Old 11-29-2012, 07:17 PM   #8
jfoj
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My Ride: '06 330CiC, '03 M5
Codes not related.

Cam sensors do go bad.

Suggest you try to check your MAF connection terminals to make sure they are tight. Have heard about loose MAF terminals on the E46 from time to time.

You may need to remove the terminals from the connector to slightly tighten them with pliers, but be VERY careful and do not mix up terminals in the connector.
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Old 11-29-2012, 07:35 PM   #9
fernando629
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Join Date: Jun 2012
Location: El Salvador
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My Ride: 325Xi 2001
Quote:
Originally Posted by jfoj View Post
Codes not related.

Cam sensors do go bad.

Suggest you try to check your MAF connection terminals to make sure they are tight. Have heard about loose MAF terminals on the E46 from time to time.

You may need to remove the terminals from the connector to slightly tighten them with pliers, but be VERY careful and do not mix up terminals in the connector.
Thanks jfoj, will try as you suggested. I will also order the CPS intake side, wierd how it started giving me issues after I replaced the CPS exhaust side (due to codes as well). Guess people are right when they say change them in pairs
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