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First start up with CEL

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Old May 30, 2020 | 08:56 PM
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Default First start up with CEL
Started the motor for the first time after my swap and I've got a CEL on. It's an 04 5.3 out of a Denali. I hooked up a scanner and I have no codes. Why would I have a CEL with no codes?
I've also got a low oil pressure light on. I'm not sure what's going on with that either. I'm going to try a mechanical guage to see if there really is low pressure. I've read about the O ring for the pickup tube ( after I put the motor in the car of course). I have to look to see if I can remove the pan in the car.
Any ideas ?
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Old May 30, 2020 | 09:01 PM
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Originally Posted by Lightn95
Started the motor for the first time after my swap and I've got a CEL on. It's an 04 5.3 out of a Denali. I hooked up a scanner and I have no codes. Why would I have a CEL with no codes?
I've also got a low oil pressure light on. I'm not sure what's going on with that either. I'm going to try a mechanical guage to see if there really is low pressure. I've read about the O ring for the pickup tube ( after I put the motor in the car of course). I have to look to see if I can remove the pan in the car.
Any ideas ?
Did you try clearing the codes with the scanner anyway? Thats all I got.
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Old May 30, 2020 | 09:38 PM
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Originally Posted by Tyler Dietzenbach
Did you try clearing the codes with the scanner anyway? Thats all I got.
yup it's still there. The ECU was sent to a local tuner to clear the VATS and that kinda stuff also.
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Old May 30, 2020 | 09:42 PM
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Originally Posted by Lightn95
yup it's still there. The ECU was sent to a local tuner to clear the VATS and that kinda stuff also.
Well I'm lost on that one then. As for the low oil oil pressure, you're already on the right track. Mechanical gauge will be key in resolving that issue.
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Old May 30, 2020 | 09:48 PM
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Maybe try a different scanner.
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Old May 30, 2020 | 09:53 PM
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Originally Posted by Tyler Dietzenbach
Maybe try a different scanner.

that's a good idea
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Old May 31, 2020 | 03:09 PM
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Looks like CEL IS from Evap codes, not sure why the tuner didn't clear them.
still not sure about the low oil pressure light though. I'll see what the mechanical guage says.
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