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5 years of storage... no boost now. ?

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Old Sep 3, 2025 | 11:09 AM
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Default 5 years of storage... no boost now. ?

Car sat since the covid BS and recently got it back out. Upon starting it, it runs pig rich. A/F shows idle at 10:1 base fuel pressure was 60psi... I changed plugs, even turned fuel pressure down to 45 and still rich, makes no sense. Car runs and drives great, but as soon as you get into it, turbo starts spooling and instantly coughs and bangs... like the plugs are shot. instant flame out.
HP tuners 2 bar setup. 99 TransAm. Car always ran perfect. 370ci, 88mm, tuning laptop hasnt been used in 5 years, hoping it will take a charge. New battery installed in car, voltage is perfect.
Would sitting dead for 5 years do anything to the PCM?
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Old Sep 3, 2025 | 11:20 AM
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any chance there is a mouse nest in the intake plumbing to the turbo? or the bearings in the turbo may have gone south?
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Old Sep 3, 2025 | 11:41 AM
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Originally Posted by Scott Danforth
any chance there is a mouse nest in the intake plumbing to the turbo? or the bearings in the turbo may have gone south?
Turbo works fine. Still spinning long after the car is shut off. Ball bearing. Car tachs up fine. Can drive fine increasing RPMS is fine, but put a load and boost and falls flat on its face.. No intake plumbing, just screen on turbo. No mice. Tank was also drained, fresh filter, new fuel. Should all be golden.
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Old Sep 3, 2025 | 01:24 PM
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If there was any ethanol in your fuel, you likely have something gummed up, stuck injectors, or something fuel related.
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Old Sep 3, 2025 | 03:47 PM
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Haven't seen your username in a while.

02 sensor issue?
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Old Sep 3, 2025 | 04:52 PM
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Pull injectors and have them gone through for sure.
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Old Sep 3, 2025 | 09:32 PM
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Originally Posted by Pro Stock John
Haven't seen your username in a while.

02 sensor issue?
It doesnt have any. Except my wideband one for logging.

Originally Posted by slowride
Pull injectors and have them gone through for sure.
It drives around the block just fine, free revs in the driveway fine. Somewhat on the rich side, but wont make the slightest amount of boost. I'd think if an injector or two were messed up it would miss bad. Its smooth as butter.
I might rewrite the ecm tomorrow and log it... if the wideband sensor is still good. Just odd to almost completely die from a roll at 3500-4000 rpms and then hit it. No ethanol has been in it. Plugs were fouled black as night when i changed them. It ran fine for a few years prior. Very reliable.
Im sick of electronic crap, nothing is reliable in time.
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Old Sep 4, 2025 | 10:10 AM
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I understand, but you will never know for sure without testing. My friend cleans injectors at his shop and the only time we ever see issues is when the sit for really long periods of time, mostly due to ethanol, but even normal pump fuel isn't what it once was.. You can try to run some stabilizer or 2 stroke oil in the fuel to pickle them a bit, but without testing it's hard to say. Make sure you fuel pressure regulator is climbing 1 to 1 with boost and check on your wideband, I often see widebands fail.
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