paggaz wrote:Thanks for that Bruce! Now have a much better understanding of it. Also will be getting it tuned by Kido next wednesday
You're welcome.
You'll be as happy as a pig in pooh following your tune.
paggaz wrote:Thanks for that Bruce! Now have a much better understanding of it. Also will be getting it tuned by Kido next wednesday
mynameisdaniel wrote:Dad was talking to a mechanic (works at one of the best Subaru mechanics in Aus, knows his stuff) and he said they've had a lot of problems with people melting pistons after replacing the dump pipe (may have been an earlier problem that is fixed in later designs). Not a problem while accelerating but on long trips at constant speed there were problems, something to do with how the accelerator worked and the car ending up running a little lean... My car is notably richer with the dump so was wondering if anyone had heard something similar...
mynameisdaniel wrote:Dad was talking to a mechanic (works at one of the best Subaru mechanics in Aus, knows his stuff) and he said they've had a lot of problems with people melting pistons after replacing the dump pipe (may have been an earlier problem that is fixed in later designs). Not a problem while accelerating but on long trips at constant speed there were problems, something to do with how the accelerator worked and the car ending up running a little lean... My car is notably richer with the dump so was wondering if anyone had heard something similar...
bass_straitener wrote:Stock the Subaru Liberty has 2 cats in the dump.
Stock the Subaru Liberty has 2 O2 sensors
Most aftermarket dumps replace the restrictive cats with a single high flow cat.
The ECU uses a formula to calculate quality of air in the exhaust between the O2 sensor in the up pipe and after it's passed the first cat in the dump.
When there are 500 error conditions when checked against expectant value you will get a CEL.
The CEL DTC P0420 (Catalytic converter inefficieny) is normally due to the replacement cat not being efficient enough to meet EPA and Subaru ECU standards.
The most common fix is to disable the DTC code in the ECU so a CEL is not thrown when the condition occurs.
If tuned correctly you can leave the code enabled and it may trigger once in a while and can be cleared. Or simply disable.
The bung in the dump pipe collector is often used for installation of a secondary wideband O2 sensor for tuning and logging.
Will be interesting to see if you get a CEL, based on where you've got the second O2 sensor installed. Or if your getting tuned soon your best bet is to have the P0420 code disabled.
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