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12-02-2025, 10:21 PM
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#15 |
  Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019
Location: Arizona
Posts: 859
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I know a performance shops should know....but have you tried a "bigger name" performance shop? I know RPM motorsports is in NC. I love their videos so id think they would have seen this before. May take more tuning/reading graphs to figure it out.
Past that, I hope it gets figured out for you and post a reply when it does im really curious. |
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12-03-2025, 05:43 PM
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#16 | |
 Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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Quote:
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12-03-2025, 05:47 PM
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#17 |
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Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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Will most likely have to try another shop as you said. I will definitely update once it's figured out.
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12-22-2025, 08:43 PM
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#18 |
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Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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Been trying to do my own testing in the meantime, and was wondering if someone could give me their thoughts on this. I logged some hard driving with my scan tool and noticed that when at WOT the pedal position is hitting 100%, but the absolute max the throttle is seeing is 75% for a second but most of the time it was sitting at 65 like in this screenshot. The bypass solenoid is also at 95% the entire time I am driving the car. When I test the solenoid with my scan tool, it opens and closes correctly and even closes when I rev in neutral. Seems like both the throttle and bypass are being restricted by the car for some reason? IATs are all good.
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12-22-2025, 09:23 PM
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#19 |
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Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019
Location: Arizona
Posts: 859
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Hmm, wonder if the TPS is going bad.
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12-26-2025, 10:06 PM
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#20 |
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Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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When I do the actuator test on the throttle, it is able to open from 1-100%, so I think the car is locked into limiting torque or something i just don't know why, and it's not throwing codes for some damn reason.
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12-26-2025, 10:45 PM
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#21 |
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Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019
Location: Arizona
Posts: 859
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Man, I really wish I (or anyone on here) had the answer for you. This is really weird. You ever call RPM? I wonder if they would have some ideas for you .
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12-26-2025, 11:46 PM
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#22 |
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Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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Trying to get into contact with a tuner rn, obviously the holidays are slowing that abit haha.
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12-27-2025, 12:40 AM
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#23 | |
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Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019
Location: Arizona
Posts: 859
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I cant remember if it was brought up, but any chance of just really bad belt slippage? Maybe a pulley is more worn that it looks? |
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12-27-2025, 07:46 PM
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#24 |
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Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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The belt was replaced by the shop I initially had looking at it, not because they thought it was a problem, but because they damaged it when they took it off. They did check all of the pulleys and said they all look great and they see no signs of belt slip (car has 17k miles).
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01-08-2026, 02:54 PM
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#25 |
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Drives: 2019 Camaro ZL1 1LE Join Date: Jul 2023
Location: Charlotte NC
Posts: 13
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Car is going to RPM on the 26th, so fingers crossed they can fix it. I took it to a Chevy dealer in the meantime, they drove it and told me the car is fine, and the boost gauge on the dash just isn't very accurate from the factory, so that was completely useless lmao.
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01-08-2026, 05:58 PM
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#26 | |
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Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019
Location: Arizona
Posts: 859
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Quote:
I hope you didn't have to pay for that diagnosis from the dealer thats just laziness. |
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