540 troubleshooting MAP vs. mechanical gauge
10-03-2019, 04:11 PM
#11
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Thread Starter
It is likely lean. But....do you have the correct MAP sensor? i.e. a 1 Bar sensor and not a 2 Bar?
If your motor is indicating lean try solve that issue first. I don't care if you think you have reversion, put some fuel into the lean spot and see what happens. Trust the wide band until proven otherwise.
If your motor is indicating lean try solve that issue first. I don't care if you think you have reversion, put some fuel into the lean spot and see what happens. Trust the wide band until proven otherwise.
Yes. 1 Bar MAP sensor. Tried a known good sensor from one of my other spare motors and have virtually identical MAP vacuum readings at idle. Also 2 different ECM’s and both display roughly the same MAP vacuum readings at idle. I don’t have the ability to tune either ECM as my understanding is that they are password protected.
10-03-2019, 04:30 PM
#12
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iTrader: (1)
Trash,
Yes. 1 Bar MAP sensor. Tried a known good sensor from one of my other spare motors and have virtually identical MAP vacuum readings at idle. Also 2 different ECM’s and both display roughly the same MAP vacuum readings at idle. I don’t have the ability to tune either ECM as my understanding is that they are password protected.
If no password, then just need MEFI Burn
10-03-2019, 07:58 PM
#17
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Thread Starter
10-03-2019, 08:00 PM
#18
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Thread Starter
10-03-2019, 08:04 PM
#19
10-03-2019, 08:10 PM
#20
Just some thoughts. If this thing just started to run lean, maybe it's an injector failure. Check your plugs and see if you have one white one, or pull the injector plugs one at a time while the motor is running to see if it makes a change.
