Notices
Series I Tech Garage The place to discuss anything technical about the RX-8 that doesn't fit into any of the categories below.

Cel #p0506

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 11-18-2007 | 06:48 PM
  #1  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Cel #p0506

About 2 weeks ago a CEL popped up. With Jedi54 recently purchased software we diagnosed the 8 with CEL #P0506 (below normal idle speed). The CEL would go on and off and I couldn't identify a pattern.

A week after (car was running fine so I didn't see an immediate need to drop it off at the dealer) the diagnosis I had the dealer look at it. They said that they couldn't properly diagnose the vehicle due to the aftermarket intake (Racing Beat with ram air duct) and that I would need to reinstall the stock to properly identify the cause of this CEL however, they did pull up the code which matched what Jedi54 had on his software.

Well I decided to do some research and discovered the following causes that may have triggered CEL #P0506

1) MAF
2) IAC
3) Intake Leak
4) Exhaust Resistriction

I decided to tackle the MAF being that it's simple and probably needs it. I purchased some CRC MAF cleaner at my local auto parts store and cleaned the IAT and MAF resistors. So far the CEL hasn't reared it's ugly head. I'll keep you informed. See MAF pics below.

Before - IAT Sensor

[IMG][/IMG]

After - IAT Sensor (sorry about poor pic, couldn't get the focus to work)

[IMG][/IMG]

Before - MAF Resistors

[IMG][/IMG]
Old 11-18-2007 | 08:44 PM
  #2  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
I'm curious to see if this helps the CEL.
Old 11-18-2007 | 10:43 PM
  #3  
nycgps's Avatar
Out of NYC
iTrader: (1)
 
Joined: Jun 2005
Posts: 19,881
Likes: 32
From: Planet Earth
Thats some *freaking* dirty IAT sensor !!!!!!!!!

wow .... this is actually the first time Im seeing such dirty sensor

I havent clean mine for couple K miles but still clean (no dirty that I can see).
Old 11-19-2007 | 12:49 PM
  #4  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
I know you'd mentioned you usually got the CEL in the mornings, any luck this morning?
Old 11-19-2007 | 12:55 PM
  #5  
tajabaho1's Avatar
Destroying Threads
 
Joined: Mar 2007
Posts: 2,296
Likes: 2
From: (swartsnegga state)
god damn, thanks man, I'm gonna check my MAF today too, it might be this problem also, see if it goes away
Old 11-19-2007 | 01:05 PM
  #6  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
random thought: odd how P0506 isn't listed in the RX-8 service Manual. :
Old 11-19-2007 | 06:52 PM
  #7  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Originally Posted by Jedi54
I know you'd mentioned you usually got the CEL in the mornings, any luck this morning?
CEL popped back up I'll have you clear the code later this week Jedi. If that doesn't work i'll have to install the stock box and have the dealer fix it.
Old 11-19-2007 | 06:53 PM
  #8  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Originally Posted by nycgps
Thats some *freaking* dirty IAT sensor !!!!!!!!!

wow .... this is actually the first time Im seeing such dirty sensor

I havent clean mine for couple K miles but still clean (no dirty that I can see).
First time cleaning the MAF sensor and I have 43k miles.
Old 11-19-2007 | 08:41 PM
  #9  
Charles R. Hill's Avatar
Owner of BHR
iTrader: (7)
 
Joined: Nov 2003
Posts: 4,101
Likes: 45
Take your accordion hose/intake duct off and try cleaning the TB. If the MAF was that dirty how about the TB?
Old 11-19-2007 | 09:48 PM
  #10  
nycgps's Avatar
Out of NYC
iTrader: (1)
 
Joined: Jun 2005
Posts: 19,881
Likes: 32
From: Planet Earth
I think you should check your air filteration. There is NO WAY it could be that dirty. Unless you havent clean it for the life of your car.
Old 11-19-2007 | 09:57 PM
  #11  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
we cleaned Newcastle's Ram Air intake about 6-7 months ago. Maybe ALL the ashes during the recent fires in CA messed things up a bit
Old 11-19-2007 | 10:10 PM
  #12  
tajabaho1's Avatar
Destroying Threads
 
Joined: Mar 2007
Posts: 2,296
Likes: 2
From: (swartsnegga state)
well I'll tell u this much my MAF sensor was also as dirty as his, and I cleaned it and now the problem seems to be better too
Old 11-19-2007 | 11:34 PM
  #13  
nycgps's Avatar
Out of NYC
iTrader: (1)
 
Joined: Jun 2005
Posts: 19,881
Likes: 32
From: Planet Earth
really ...

Well, if thats the case, you guys know about the dust. shouldnt you guys clean it more often ? both filter and whatever.
Old 11-20-2007 | 09:28 AM
  #14  
Razz1's Avatar
Mu ha.. ha...
 
Joined: Aug 2004
Posts: 14,361
Likes: 3
From: Cali
Do not take it to the dealer. Just disconnect the battery for a few minutes and rest the PCM.

Re-tighten the MAF tube and all connections.

Check that Red plug under the throttle body. It may be causing an air leak.

They have een known to get loose.

Most likey that's the problem. Use silcone to secure it on.
Old 11-20-2007 | 10:17 AM
  #15  
max5roadster's Avatar
INDY RX8 CLUB - Officer
 
Joined: Jan 2005
Posts: 321
Likes: 1
From: Nashville,IN
Pretty sure the brown node that you see in the first 2 pics is not the MAF Sensor, but the intake temp sensor. IIRC, the MAF sensor is the wire section you show in the 3rd pic. It didn't look too bad in that pic.
Old 11-20-2007 | 01:51 PM
  #16  
nycgps's Avatar
Out of NYC
iTrader: (1)
 
Joined: Jun 2005
Posts: 19,881
Likes: 32
From: Planet Earth
most of us know that.

but the point is, if his temp sensor has dirt like that, imagine how does it look like on those 2 wires inside the unit ...
Old 11-20-2007 | 03:53 PM
  #17  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
Originally Posted by Razz1
Do not take it to the dealer. Just disconnect the battery for a few minutes and rest the PCM..
No need for that, I used my Scanaylzer to reset the code a few weeks ago, now it's back.

Re-tighten the MAF tube and all connections.
I'm assuming this got done when he put it back on??


Check that Red plug under the throttle body. It may be causing an air leak.
Good suggestion Razz, that damn thing does get loose after a while. (it's for those who have the RB intake, which Newcastle does)
Old 11-20-2007 | 05:19 PM
  #18  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
Originally Posted by Charles R. Hill
Take your accordion hose/intake duct off and try cleaning the TB. If the MAF was that dirty how about the TB?
I'll look into this, thanks Ray
Old 11-20-2007 | 06:32 PM
  #19  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Originally Posted by Charles R. Hill
Take your accordion hose/intake duct off and try cleaning the TB. If the MAF was that dirty how about the TB?
Great suggestion! I'll work on that this week.
Old 11-20-2007 | 06:38 PM
  #20  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Originally Posted by Jedi54
I'm assuming this got done when he put it back on??
Of course.



Originally Posted by Jedi54
Good suggestion Razz, that damn thing does get loose after a while. (it's for those who have the RB intake, which Newcastle does)

I checked that out already and it's very secure.
Old 11-20-2007 | 06:39 PM
  #21  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
we need to clear your CEL again to make sure we can properly troubleshoot this.
I should start charging locals for pulling / clearing codes. (j/k)
Old 11-24-2007 | 09:54 PM
  #22  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Update: I cleaned the throttle body and air filter (it did have a thick black ring encompassing the butterfly valve which was a PITA to clean). Unfortunatly it didn't fix the CEL. I'll be removing the RB and installing the stock intake so the dealer will correct the issue. I'll keep you folks updated.
Old 11-24-2007 | 10:23 PM
  #23  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
good luck with the dealership! Hopefully with the stock intake going back in they'll have no more excuses and will actually fix this
Old 12-06-2007 | 08:19 PM
  #24  
newcastle's Avatar
Thread Starter
Carbon Fiber Roof
iTrader: (3)
 
Joined: Sep 2004
Posts: 442
Likes: 0
From: Menifee, CA
Update: Dealer said I had a bad TB. Got a new TB under warranty however, the they said that the RB CAI may have generated the problem. If this problem were to occur again with the RB then they will not cover it under warranty. Personally i'm perplexed as to how the RB CAI can cause TB failure. In order to mitigate future headaches/pissing matches I have decided to simply install the stock intake. Car idles much smoother and runs great now.
Old 12-06-2007 | 08:26 PM
  #25  
Jedi54's Avatar
Administrator
iTrader: (7)
 
Joined: Mar 2004
Posts: 22,444
Likes: 2,797
From: The Dark Side
you're not going to leave the stock intake in there for long, are you????
There's NO way the RB CAI damaged your TB.


You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Cel #p0506



All times are GMT -5. The time now is 05:52 PM.