Turbo going lean after 20 mins of driving

Bad O2 sensor maybe. You would think it would happen faster than 20 mins... but anything is possible. If you have access to another one you could give it a shot.... Or you may have a bad MAP sensor and its not reading boost correctly. Make sure it's seated good. If it is seated good you may need to try a new MAP sensor.

First thing I might do is unplug all 3 of my ECU plugs for about 10 minutes then plug them back in and drive it. May have some bad juju in it. I'm a believer in letting the bad or stale electrons out by unplugging stuff for a little bit.

It may not throw a code if either of those are just reading a little bit off. I would just unplug the ECU plugs for a few minutes and let any data the ECU has learned go away. Then plug them back in a go for a normal drive for a while. I would let it relearn some of its tables.

MAP sensor is above the throttle body and below the fuel injector rail. before you go to the effort of checking it just clear the ecu and see how that works.

The MAP sensor won't be available at a parts store most likely. Try the O2 sensor first and make sure you coat the threads with anti seize. Don't get any on the tip of the O2 sensor. Just the threads. It's a Cadillac O2 and it's 49.00 if you get the corrext one. There is a thread on here with the exact part number. I'll see if I can find it.

O2 sensor replacement. Exact duplicate Bosch part

16746 bosch

That would be ok when cruising. 14.7 is perfect. So 15 would be good. And the 11 and 12 would be ok under throttle. I like the 11 range. But 12 is good.

So it sounds like it made a definite difference??

The climbing part wouldn't be good. Not sure what you have going on. If the map sensor is seated it should be ok. But if you don't mind ordering one to have as a spare you might order one to try and have it as a spare. Maybe someone will chime in with another suggestion.

I had a map sensor go out on my Hahn and had to have @Noel Hughes get me another. When mine went out there was a LOUD backfire (causing me to crap in my pants) then NO boost at all.

Quote from jaycanter

@Bill Martin I don't have a back fire it like somebody shut of the ignition until i let off the gas. Guess I'll be trying to find map sensor. Hopefully cycle will have in stock.

Mine only did the one backfire then ran just as you describe until I got it home - easy 2 minute repair - getting a sensor took 10 days - good luck

Quote from rabtech

Bad O2 sensor maybe. You would think it would happen faster than 20 mins... but anything is possible. If you have access to another one you could give it a shot.... Or you may have a bad MAP sensor and its not reading boost correctly. Make sure it's seated good. If it is seated good you may need to try a new MAP sensor.

First thing I might do is unplug all 3 of my ECU plugs for about 10 minutes then plug them back in and drive it. May have some bad juju in it. I'm a believer in letting the bad or stale electrons out by unplugging stuff for a little bit.

What he said. That always clears up my error codes.

Just make sure you get the 2 bar map sensor (assuming you have the 2 bar tune)

Quote from jaycanter

@Bill Martin thanks for Cycle Springs heads up. I have been waiting over a week for Hahn to get me the color of the powder coat. So hopefully i can find elsewhere. I did find a Borg Warner local but not sure if want to test different model according to counter guys.
@funinthesun it should be 2 bar since i ordered the 2x system.

I dunno - that is DEFINITELY not the sensor I replaced - ask Fernando at Cycle Springs - he will tell you right quick what ya need.