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Discussion Starter #1
Good day and thank you in advance for your time and effort!


VEHICLE:
BMW X5 2001 (E53) (S/N: lm65545)

STORY:
Off and on this winter I have received a P0492. I thought it was just the cold. Then recently it started to stutter and stall. When I restarted it would be okay for a moment then start the stuttering again. When I went in for the codes it gave P0335 (crankshaft sensor fault), P0492 (Secondary Air) and all cylinders misfired. So, I decided to replace the vacuum tubing (everything down from the Secondary Air Injection Control Valve) for the P0492 problem hoping that would help the P0335, as my research showed that might take care of both. Nope. After driving, following the vacuum tube replacement, it ran well for a mile or so then started to stutter and stall again, requiring that I drive very conservatively and limp into the parts store who read new codes.

CODES:

  • P1602 (Control Module Self Test, Control Module Defective)
  • P0335 (Crankshaft Position Sensor A Circuit Malfunction)
  • P0492 (Secondary Air Injection System Insufficient Flow Bank 2)
  • P0727 (Engine Speed Input Circuit No Signal)
  • P0102 (Mass or Volume Air Flow "A" Circuit Low Input)
  • P0340 (Camshaft Position Sensor Circuit Malfunction (Bank 1))
WHAT DO YOU THINK?

[FONT=&quot]Thank you for your help!

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Hey there,

When mine did this (stall and putter along), I found I had a broken DISA. Easy to replace (about 15 minutes). The flap that opens and closes is vacuum controlled, but the actual flap had broken and stuck almost fully closed. No air = stalls.

Hope this helps!

Search:

FIXED Rough Idle - New DISA - Pic of old broken one

(has pic)
 

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Discussion Starter #3
Hey there,

When mine did this (stall and putter along), I found I had a broken DISA. Easy to replace (about 15 minutes). The flap that opens and closes is vacuum controlled, but the actual flap had broken and stuck almost fully closed. No air = stalls.

Hope this helps!

Search:

FIXED Rough Idle - New DISA - Pic of old broken one

(has pic)

Hello Rickster,
Thank you for your response, I appreciate your insights as this solution had not come up in my lengthy research, but is a valid concern. I will pop it off to see about failure.

Everyone else and all my research has pointed toward that crankshaft sensor. I almost ordered one.

Thank you again,
Liotb
 

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Bt the way, before ordering a new disa, remove the disa and do a check to see if it works. I ordered a replacement before checking, but realized the vacuum on existing disa worked fine, but really just needed a new O-ring. The old one was 15 years old so I went ahead and changed disa and it almost immediately started running fine.
 
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