L84 intermittent non-start
Thread Starter
Launching!
Joined: Dec 2013
Posts: 255
Likes: 58
From: Portugal
L84 intermittent non-start I have a L84 (Gen V minus DOD) transplanted into a 1971 LeMans. It is run by Swap Time tuned ECM from a 2014 Corvette. It refuses to fire occasionally, usually when warm - but will after a minute or two, The battery is mounted in the trunk and 6 months old. No codes seem to be thrown, at least the SES light is not lit.
Ideas?
Ideas?
Last edited by Scarebird; Oct 7, 2023 at 04:41 PM.
Thread Starter
Launching!
Joined: Dec 2013
Posts: 255
Likes: 58
From: Portugal
A quick scan with the BATF tool and Torque app show a few faults:
Cuurent: P0521 - Oil pressure sensor error
Current: P06DA - Powertrain (oil pressure control circuit)
Historic: P127C - Powertrain (high pressure fuel rail sensor)
All will not allow the engine to fire. This started couple months ago, now with increasing frequency.
Cuurent: P0521 - Oil pressure sensor error
Current: P06DA - Powertrain (oil pressure control circuit)
Historic: P127C - Powertrain (high pressure fuel rail sensor)
All will not allow the engine to fire. This started couple months ago, now with increasing frequency.
Thread Starter
Launching!
Joined: Dec 2013
Posts: 255
Likes: 58
From: Portugal
A discussion with Mitch at Swap Time revealed several possible issues:
1. Since the car has a trunk mounted battery the voltage may not be enough to run the PCM. I put in a decent battery but still..
2. He was concerned with the fuel pump - specifically the hose running in the tank. He notes these have a tendency to swell and cut flow down.
He feels the voltage issues is triggering false codes. Too bad the PCM does not have a code for low input voltage...
1. Since the car has a trunk mounted battery the voltage may not be enough to run the PCM. I put in a decent battery but still..
2. He was concerned with the fuel pump - specifically the hose running in the tank. He notes these have a tendency to swell and cut flow down.
He feels the voltage issues is triggering false codes. Too bad the PCM does not have a code for low input voltage...
