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Intake manifold noise

  #1  
Old 02-23-2011, 08:48 AM
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Default Intake manifold noise

1999 S80 2.9

Just changed O2 sensors and reset fuel trim and cleaned the throttle body less thana month ago. I am currently experiencing a "clicking" or "tapping noise" that seems to be coming from the intake manifold area. Car revs harder than usual on cold start (used to rev up to about 1500 and now does it to 2000 and settles down to 1000 instead of 500-700 until it warms up and then it drops down to 500). Is this a vacuum hose/gasket leak in my intake manifold? Failing ETM? Piston slap? Or something far worse?

Thanks.
 
  #2  
Old 02-23-2011, 11:28 AM
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Check the intake plumbing under the throttle body. Clicking noise is typically your injectors.

Throwing a CEL or any codes?
 
  #3  
Old 02-23-2011, 11:34 AM
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No codes. Just really noisy. Fuel injectors are pretty new. I'll check the plumbing around throttle body.
 
  #4  
Old 02-23-2011, 06:58 PM
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On way home Check Engine light came back on. Now throwing codes p0141 and p0161. All four sensor are brand new. Will clearing them with ElmScan OBD not do the trick or could my Cat be bad on top of everything else? This car is going to kill me....
 
  #5  
Old 02-23-2011, 06:59 PM
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Plumbing for throttle body appears to be in working order.
 
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Old 02-23-2011, 07:09 PM
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Originally Posted by schwatd View Post
On way home Check Engine light came back on. Now throwing codes p0141 and p0161. All four sensor are brand new. Will clearing them with ElmScan OBD not do the trick or could my Cat be bad on top of everything else? This car is going to kill me....
p0141 Rear heated oxygen sensor (HO2S), preheating Faulty signal. Permanent fault

p0161 Rear heated oxygen sensor (HO2S) preheating, bank 2 Faulty signal. Permanent fault
 
  #7  
Old 02-23-2011, 07:21 PM
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Originally Posted by 75ohm View Post
p0141 Rear heated oxygen sensor (HO2S), preheating Faulty signal. Permanent fault

p0161 Rear heated oxygen sensor (HO2S) preheating, bank 2 Faulty signal. Permanent fault

Brand new sensors. Installed this weekend. What else could cause it to throw this code?
 
  #8  
Old 02-23-2011, 07:46 PM
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What did you do to "reset fuel trim"?
 
  #9  
Old 02-23-2011, 08:09 PM
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Unplugged battery after clearing codes. Is there something else?
 
  #10  
Old 02-23-2011, 08:22 PM
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How many miles on this vehicle?
 
  #11  
Old 02-23-2011, 08:29 PM
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Originally Posted by 75ohm View Post
How many miles on this vehicle?
176k. Right out of school. Need it to last a little longer. If it is just the Cat I will live with it. No emission tests here.
 
  #12  
Old 02-24-2011, 08:13 AM
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Curious about the timing... VVT specifically.
 
  #13  
Old 02-24-2011, 08:26 AM
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Originally Posted by 75ohm View Post
Curious about the timing... VVT specifically.
What do you want to know?
 
  #14  
Old 02-24-2011, 08:32 AM
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Any timing belt work or anything going on with the VVT? If you are hearing clacking/tapping and you are throwing o2 codes, and you've got some rev issues you may have something going on with a valve... don't mean to alarm...

How many miles on the current timing belt?

Can you do a compression test?
 
  #15  
Old 02-24-2011, 08:46 AM
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Originally Posted by 75ohm View Post
Any timing belt work or anything going on with the VVT? If you are hearing clacking/tapping and you are throwing o2 codes, and you've got some rev issues you may have something going on with a valve... don't mean to alarm...

How many miles on the current timing belt?

Can you do a compression test?
Pulled a CVVT solenoid code once but it went away and hasn't been back. Not sure about the miles on the timing belt. There is no sticker for work done but the mechanic thought the belt was in good shape. I was afraid it might be a stuck valve lifter or something of the sort.
 
  #16  
Old 02-24-2011, 08:56 AM
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I truly do appreciate your help, 75.
 
  #17  
Old 02-24-2011, 11:59 AM
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By rough approximation, to me, it could be related to the issue... timing, exhaust gases, etc.
 
  #18  
Old 02-25-2011, 09:38 AM
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It kind fo sounds like this engine:

http://www.youtube.com/watch?v=pxRx31f6BXQ

I guess it sould be a coil or wiring. The coils are all fairly new.
 
  #19  
Old 02-25-2011, 09:45 AM
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Originally Posted by schwatd View Post
I truly do appreciate your help, 75.
No worries, that's what we're here for!
 
  #20  
Old 02-25-2011, 09:52 AM
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Originally Posted by schwatd View Post
It kind fo sounds like this engine:

http://www.youtube.com/watch?v=pxRx31f6BXQ

I guess it sould be a coil or wiring. The coils are all fairly new.
If you had a coil or wiring issue you'd throw a CEL and pull a misfire on the OBD...

If not coil, and more timing/fuel mapping, you could possibly get that noise.

How's the tension on the timing belt?
 

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