CEL fix?
Thread Starter
Instructor
Joined: Oct 2011
Posts: 216
Likes: 46
From: Shelton, WA
CEL fix?
http://www.ebay.com/itm/Stainless-St...#ht_500wt_1387
So far 2 days and no CEL! I put the above extension in at the aft O2 sensor locations and so far all good with no CEL. Hopefully the joy will last!
So far 2 days and no CEL! I put the above extension in at the aft O2 sensor locations and so far all good with no CEL. Hopefully the joy will last!
Thread Starter
Instructor
Joined: Oct 2011
Posts: 216
Likes: 46
From: Shelton, WA
Sorry for the lack of detail. I bought the car about a month ago and the second day after bringing it home I had the CEL come on and found codes associated with the cats the intakes and a few others. Since this is my first P-car and the exhaust is "custom with high flow cats", no after market warranty applied, so I was a bit frustrated. After some research and great work by two local shops…. all is clear.
The elbows were my idea since implementing them was similar to my previous car's setup and it's a pretty simple trick to fake out the aft O2 sensors.
The elbows were my idea since implementing them was similar to my previous car's setup and it's a pretty simple trick to fake out the aft O2 sensors.
Race Director
Joined: Sep 2006
Posts: 19,031
Likes: 266
From: Bentonville, AR
Sorry for the lack of detail. I bought the car about a month ago and the second day after bringing it home I had the CEL come on and found codes associated with the cats the intakes and a few others. Since this is my first P-car and the exhaust is "custom with high flow cats", no after market warranty applied, so I was a bit frustrated. After some research and great work by two local shops
. all is clear.
The elbows were my idea since implementing them was similar to my previous car's setup and it's a pretty simple trick to fake out the aft O2 sensors.
The elbows were my idea since implementing them was similar to my previous car's setup and it's a pretty simple trick to fake out the aft O2 sensors.
The DME will attempt to supply fuel to the engine (within limits) that result in the proper readings and behavior of the #2 O2 sensors.
While there is no CEL and error code associated with the #2 sensors, how sure are you the engine is being fueled optimally?
The Turbo engine is fitted with wideband #1 O2 sensors because fueling control is more precise with these. This is of course because the Turbo engine (any turbo-charged engine, really) is more sensitive to imprecise fueling.
Sincerely,
Macster.
Rennlist Member
Joined: Nov 2010
Posts: 2,740
Likes: 17
From: SE Florida
Macster, thecel codes he is refering to is PO420 and O430, which indicates catalyist effeciency. When a bypass pipe or high flow cats replace the factory, the sensor is basically saying you have a bad cat. So it's not measuring O2 for fueling. This sensor measure catalyst which provides a means to meet emission standards!
Burning Brakes
Joined: Apr 2007
Posts: 905
Likes: 2
From: N. California
Macster, thecel codes he is refering to is PO420 and O430, which indicates catalyist effeciency. When a bypass pipe or high flow cats replace the factory, the sensor is basically saying you have a bad cat. So it's not measuring O2 for fueling. This sensor measure catalyst which provides a means to meet emission standards!
(The pre-cat O2 is used for fuel, hence cat codes or cat function doesnt matter.)
As long as you know that AFR is right and the engine is running well, using a bung extender to fool the post cat is OK I guess.
Me, I invested in high quality cats.
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Race Director
Joined: Sep 2006
Posts: 19,031
Likes: 266
From: Bentonville, AR
Macster, thecel codes he is refering to is PO420 and O430, which indicates catalyist effeciency. When a bypass pipe or high flow cats replace the factory, the sensor is basically saying you have a bad cat. So it's not measuring O2 for fueling. This sensor measure catalyst which provides a means to meet emission standards!
If these adapters bias the readings of the sensors the engine controller will adjust fueling to compensate.
Auto makers are tasked with providing clean running engines so the engine controller will attempt to tailor the air/fuel mixture, probably leaning the mixture out to provide more oxygen for the converters to store, in order to bring the #2 sensor readings back into their nominal readings.
So the mixture can affected even though it is the #2 sensors that are being 'fooled'.
Were I in the OP's shoes, after installing these sensor spoofers, I'd want to have the engine's AFR checked to ensure the engine was receiving optimal fueling.
Sincerely,
Macster.
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Thread Starter
Instructor
Joined: Oct 2011
Posts: 216
Likes: 46
From: Shelton, WA
The AFR was rich (found that out the second day after bringing the car home) and that has been fixed as well. The plan now is to really optimize the setup for the best performance.
Last edited by Nikon FM; Nov 11, 2011 at 11:02 PM.
