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My car is 2010 Base Model Auto
I installed TPS Headers & xpipe, Granatelli MAF, Corsa intake, 240 amp alternator and big 3 wire upgrade.
After install on first start- the starter failed to disengage. The car ran like garbage. Had the O2 sensor codes and a P0117 and no temperature reading. When flashing codes the temp would read then go away and say hot engine dont run ac- high speed fan is one. Finally got starter to disengage after unhooking the big 3 upgrade.
My question is knowing I need to get it tuned but I am wondering if I crossed the O2 sensors and that can contribute to the running issue. I am assuming the temp reading code will go away with tune.
Any help advise is appreciated
Be sure the tuner adjusts the O2 sensor timing parameters in your tune. Since the O2 sensor has moved much further away from the cylinders, that part of the tune needs to be updated. I didn't know this at first, and my car ran like a** for a long time as a result. I thought it was cam surge, but it was the tuning of the O2 sensors.
Be sure the tuner adjusts the O2 sensor timing parameters in your tune. Since the O2 sensor has moved much further away from the cylinders, that part of the tune needs to be updated. I didn't know this at first, and my car ran like a** for a long time as a result. I thought it was cam surge, but it was the tuning of the O2 sensors.
Are you referring to the O2 ready and not ready timers? What did you set them to? thanks
I agree about the MAF. I found the issue with P0117- the connection to my temp sensor driver side was not making contact. Tuner appt set for this month with Chris Henry Motorsports.
These are the relevant tables, found in my tune under Engine/Fuel/Oxygen Sensors.
If you look at the shared tunes on HP Tuners, there are a *lot* of tunes with these changes in them. I think this is a common fix for surging caused by the location of O2 sensors further downstream from the engine when long tubes are installed. Every tune I've seen has the *same* numbers in the 'proportional vs. mode' table and the 'limits' table. I think you will be very very close just dropping those numbers right into your tune. This seems to be the magic recipe for a lot of people.
Ok, good to know. I just took a look at my tune. The first 2 tables you posted are the same as mine was stock, which was unchanged. The 3rd table was all 2.00 stock, it's currently 1.75. But I don't know what that means, and it seems to be running fine, so maybe it's best I just leave it alone
Ok, good to know. I just took a look at my tune. The first 2 tables you posted are the same as mine was stock, which was unchanged. The 3rd table was all 2.00 stock, it's currently 1.75. But I don't know what that means, and it seems to be running fine, so maybe it's best I just leave it alone
I started with the tune that GM put in my GMPP controller, which was intended for the LS376/480 that I bought. The first two tables were a lot different than what I showed above. The third table was all 2.00.
However, the third table has the least effect. My understanding is that it limits how much the PCM is allowed to move the air fuel ratio around in the various modes... and modes essentially convert to airflow due to the first table. But my experience is that if the first two tables are right, the third doesn't matter as much, I've tried values from .05 to 2.00 with no noticeable difference in behavior.
Mike
Last edited by grubinski; Mar 27, 2021 at 11:31 PM.
Questions after header install
