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Chevrolet Express
Platform: GMT Van

Chevy Express Starts and dies

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Old Mar 3, 2024 | 10:24 PM
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No just tested fuel pressure when this happen have 55-60 when turn key on and stays about 55 when cranking
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Old Mar 3, 2024 | 10:24 PM
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Originally Posted by bradybargo
the converters have been cut so don’t have no O2 Sensor
The engine will never run properly without upstream O2

Originally Posted by bradybargo
why was I able to start and drive it one time
I dunno ... lucky I guess
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Old Mar 3, 2024 | 10:26 PM
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Yes I understand that, but I would assume it would start and spit and sputter cause of the O2. Being missing like I said pouring gas on filter it will run so what would you do next?
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Old Mar 3, 2024 | 10:29 PM
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Put the O2 sensors back. You don't have to have the downstream one, but you will have a permanent malfunction light.
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Old Mar 3, 2024 | 10:31 PM
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So you think the o2 sensor is causing a no start? I mean yes it controls the air and fuel mixture but it does not shut the fuel off
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Old Mar 3, 2024 | 10:33 PM
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I know people running 5.7 with practically open headers straight pipe all the way back so I don’t believe o2 would cause a no start
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Old Mar 3, 2024 | 10:37 PM
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Originally Posted by bradybargo
So you think the o2 sensor is causing a no start?
You said it starts, then dies.

Originally Posted by bradybargo
I mean yes it controls the air and fuel mixture but it does not shut the fuel off
Fuel doesn't need to shut off to stall an engine. It needs proper mixture to run. If it's bad enough it misfires or stalls.
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Old Mar 3, 2024 | 10:38 PM
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Originally Posted by bradybargo
I know people running 5.7 with practically open headers straight pipe all the way back so I don’t believe o2 would cause a no start
They still need upstream O2 sensors for fuel injection.
Either that, or they swapped to carburettors.
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Old Mar 3, 2024 | 10:41 PM
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Also own a s10 with 4.3 and it also has no cats runs throws a code for them but starts and runs drove it for a year like that from junkyard that’s why I was saying I wouldn’t rely on the o2 causing a no start
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Old Mar 3, 2024 | 10:42 PM
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Back story about this van it has 70k miles on it and had water up to floor board
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