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post #16 of 24 (permalink) Old 02-20-2019, 10:03 AM
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Originally Posted by TopDown13 View Post
So here's a new twist. I'm currently sitting on 3 obd readers. The CEL light came on today, and 2 of them say P2188, but the other says P0121 (throttle position sensor - TPS). I guess I'll try replacing the throttle body since the TPS is integrated with it since that's a lot cheaper than a HPFP.

I live in Irvine and would love an HP Tuners log. Anybody like Islay scotch?
If you didn't mind heading out to the Temecula area...LOL


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post #17 of 24 (permalink) Old 02-20-2019, 01:13 PM Thread Starter
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Temecula is easy. Maybe spend the night and check out a few wineries!
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post #18 of 24 (permalink) Old 02-20-2019, 02:58 PM
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We could set up a day for this. It will depend on what's going on with @skersfan though as I do need to upload his latest tune onto his car.


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post #19 of 24 (permalink) Old 02-20-2019, 05:20 PM Thread Starter
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Sounds good, Robo. A new throttle body should get here in a few days, so I'll install that first.

I set up a dashboard screen (see attached image) and took a short drive, mashing the pedal to the floor. The little red carets on the dials show that I hit 100% load, but the pedal maxed out at about 86%, the throttle at about 84%, and the relative throttle at almost 70%. Shouldn't the throttle open to almost 100% under 100% load? And why doesn't the pedal show 100% when floored?

Thanks again.
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post #20 of 24 (permalink) Old 02-20-2019, 07:23 PM
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IMSMC, TPS will only state up to 85%. For some reason this sticks in the back of my head.... Oh, and don't go starting the car right away after you put the new TPS in.... It has to "learn".... You might want to do research and figure out how to make it learn....
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post #21 of 24 (permalink) Old 02-20-2019, 08:21 PM Thread Starter
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Thanks! Good to know about the max TPS reading. I'm planning to follow the relearn instructions given here: https://www.solsticeforum.com/forum/...relearn-46089/
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post #22 of 24 (permalink) Old 02-20-2019, 09:11 PM Thread Starter
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Confirmation of The_Ghost's memory: in 2008, [email protected] wrote "late model GM's will only read 86-88% when the throttle is actually physically open 100%."
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post #23 of 24 (permalink) Old 02-21-2019, 12:46 PM
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Yep, Ghost is right. It will never read 100%...always mid 80s.
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post #24 of 24 (permalink) Old 02-24-2019, 07:30 PM Thread Starter
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So I installed a new throttle body and TB seal then followed the idle re-learn process outlined in https://www.solsticeforum.com/forum/...relearn-46089/ , removing and reinserting the fuses, etc.

I was feeling hopeful because the AFR was behaving itself (lambda close to 1.0) for the 8 minutes I let the engine idle in my driveway. I then went on a 40-mile drive, spirited and docile, highway and stop & go traffic. For the first 25 miles, AFR was OK. But then the gremlin returned, and lambda fell to 0.7-0.85 at idle. Ugh.

It appears a trip to Temecula is in order...LOL.
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