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  #1  
Old 03-06-2004, 03:40 PM
The Other Tom The Other Tom is offline
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Location: South Carolina
 
Join Date: Sep 2002
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Mein Auto: 2008 335i
What does secondary air sys. flow too low mean ?

My wife has a 2001 325i. The check engine light keeps coming on and the dealer has not been able to diagnose it. (OK, by the time I get it to the dealer, the light has gone out).
I finally broke down and bought a Peake code reader, which says F5 (secondary air system flow too low, cyl #1-3), and F6 (secondary air system flow too low, cyl# 4-6). Does anybody know what this really means ? Possibly bad air pump ?
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2001 325i retired
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1998 Z3 2.8L retired
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  #2  
Old 03-06-2004, 06:33 PM
RoyE46 RoyE46 is offline
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Location: Seattle
 
Join Date: Jan 2004
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Mein Auto: 98 328i
The secondary air pump seems to usually fail because the exhaust check valve went first. This lets wet and corrosive exhaust into the air pump, which then fails. So if you replace the pump, do the valve too.
  #3  
Old 03-08-2004, 04:55 AM
The Other Tom The Other Tom is offline
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Quote:
Originally Posted by RoyE46
The secondary air pump seems to usually fail because the exhaust check valve went first. This lets wet and corrosive exhaust into the air pump, which then fails. So if you replace the pump, do the valve too.
Thanks, Roy. Anybody else have any ideas ?
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2008 335i
2001 325i retired
2000 M Roadster Imola Red retired
1998 Z3 2.8L retired
  #4  
Old 03-08-2004, 08:33 AM
vm vm is offline
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Location: Pittsburgh, PA
 
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Mein Auto: 330i
Quote:
Originally Posted by The Other Tom
Thanks, Roy. Anybody else have any ideas ?
Same thing happened to me and it was what Roy said. You can check the pump easily after a cold start just go close to it and hear if it sounds like a high pitch subtle whine (good) or make all kinds of weird noises (bad). It goes off by itself after about a minute. Solve the problem quickly because a rich mixture can clog the cat converters.
  #5  
Old 03-11-2004, 09:03 AM
Alex Alex is offline
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Location: on 130R
 
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Mein Auto: E46
Wink

This happened to me too. Dealer said the secondary air pump and valve need to be replaced and it's being done as I'm writing this. Took 3 weeks for the parts to get here, though. I don't know if it's related but my fuel economy went really down, dealer did not know if this is related to the faulty part.
  #6  
Old 03-11-2004, 08:19 PM
The Other Tom The Other Tom is offline
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Location: South Carolina
 
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Mein Auto: 2008 335i
Thanks for all the replies. I took my car in today and the service advisor said it was a bad diverter valve. They replaced it. He said they tested the air pump and it was ok No check engine light...yet.
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2008 335i
2001 325i retired
2000 M Roadster Imola Red retired
1998 Z3 2.8L retired
 

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