AC Compressor Bypass

What's a good sign that the cats are bad And how long do you think before the car stops running? I only have 111xxx miles on it so I'm kinda Surprised if the cats are bad... Not to sure if previous owner replaced the coils or plugs I bought it with 106xxx on it
 
The cats can be seriously damaged in only a few miles. If yours are failing, it's not due to age or mileage. It's due to the being run with misfires that let raw fuel (gasoline) hit the cats and overheat and melt them. (They could fail at 100 miles or less with a badly misfiring engine, or they could last for 500,000 miles with an engine that never misfired.) If you've fixed the misfires, then it may be possible for you to continue to run indefinitely with them with the only symptom of a problem being that the check engine light is on. On the other hand, if they are already badly damaged, the engine will loose more and more power till it can't run at all due to the exhaust restriction from the melted cats.
 
The cats can be seriously damaged in only a few miles. If yours are failing, it's not due to age or mileage. It's due to the being run with misfires that let raw fuel (gasoline) hit the cats and overheat and melt them. (They could fail at 100 miles or less with a badly misfiring engine, or they could last for 500,000 miles with an engine that never misfired.) If you've fixed the misfires, then it may be possible for you to continue to run indefinitely with them with the only symptom of a problem being that the check engine light is on. On the other hand, if they are already badly damaged, the engine will loose more and more power till it can't run at all due to the exhaust restriction from the melted cats.

Thank you for the info man! I'm taking care of problem after problem and am down to the newest one. I haven't fixed my cats yet and am left with the dreaded P0420/030 codes As well as the P0775. Just got a new hissing sound under my car. Most notieable underneath on the driver and passenger sides. Haven't been able to pinpoint the sound just yet but it appears to fade away when I have my vehicle in gear and goes away when driving (from what I can tell while driving with the door open) seems to come back when I put the car in park. Any insight to offer for a diagnosis until I can get it into the shop? I was guessing an exhaust leak but a second and / or third opinion can't hurt!
 
You'll want to correct that solenoid assembly/wiring/PCM problem as soon as possible, before more damage is done.
The hissing could be exhaust, or it could be the transmission (might be the sound of fluid spraying inside a broken or worn servo).
 
You'll want to correct that solenoid assembly/wiring/PCM problem as soon as possible, before more damage is done.
The hissing could be exhaust, or it could be the transmission (might be the sound of fluid spraying inside a broken or worn servo).

If it were to be transmission fluid spraying wouldn't there be signs of fluid on the pavent? I've checked for fluid leaks and all I get is the occasional droplets of what looks and smells like water droplets from the AC at the front of car. I want to take care of the PCM and am aware that the P0775 is most likely servo bore damage but am taking care of the cheaper fixes first before they become more expensive issues.. I have a good welding man who's gonna weld some new cats in But If there was an exhaust leak would I be better off buying the whole assembly? Kinda surprised this vehicle could have so many issues within the first 5 months of ownership... I bought it with the intent of being able to fix the tranny as it was the only problem with this L, did you have these type of expenses With your Ls? It's such a great car and don't want to give up on her just yet.. there anything else I should keep an eye on?
 
If it were to be transmission fluid spraying wouldn't there be signs of fluid on the pavent? ...

No, spraying internally, inside the servo bore cover, where it just drains back into the pan. Note that the P0775 should be an electrical fault, and should be a separate issue from any servo bore problems.

... Kinda surprised this vehicle could have so many issues within the first 5 months of ownership... I bought it with the intent of being able to fix the tranny as it was the only problem with this L, did you have these type of expenses With your Ls? It's such a great car and don't want to give up on her just yet.. there anything else I should keep an eye on?

This may very well be why the previous owner sold it. When I get rid of either of mine, it will be because I feel that several expensive faults are developing. I believe that both of mine have and are doing quite well. I have a 2004 (about 170K) and a 2006 (about 130K), both since new. Off the top of my head... Three AC compressors, two DCCVs, 16 coils and plugs at least, one solenoid assembly, two front hubs, need to replace one motor mount, should replace one damper, most of the cooling system parts on both, four rear toe links, four rear sway bar end links, one ash tray, one seat bottom cover (need three more), one heated/cooled seat fan repair, oil changes and filters, two head-units, repairs from being T-boned, fixed message center buttons x2, replaced overhead console on one, fixed parking brake and AdvanceTrac buttons x3, brake pads and rotors x5 (or so), tires x?, one remote, subs x4, a few bulbs in the rear, but none in the front so far, one mirror motor not working, ...
 
there anything else I should keep an eye on?

You should plan to expect to replace all of the plastic cooling components and the coils and plugs, if you have not done so already - costs vary depending on whether you can do the work yourself or not. All of the cooling components, except maybe the radiator can be done DIY. Same for coils and plugs, but the coils aren't cheap (don't buy aftermarket or ebay coils).
 

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