LPG idle misfire issues - Page 2

mcfe · Dec 1st, 2023, 18:27

Spark energy is affected by battery voltage and rpm. On my s60 p2, there is a dwell time table in the ecu code. It affects how long the coil is charged and how strong the spark is based on Voltage and RPM.

Jason t5 · Dec 5th, 2023, 09:00

I did wonder if it was a battery issue so I replaced it with a brand new one.. still having the same problem 😔

mcfe · Dec 6th, 2023, 10:11

I am guessing it drives fine on gasoline? To me it sounds like the car is adapting to the running of LPG and is detecting either too lean or too rich and is changing injection times WHICH ARE INTERCEPTED by the LPG computer, which affect your lpg system. That or the LPG system is doing some adapting of its own.

I would look at STFT LTFT values just to verify between LPG and Petrol in real time of course. You need to figure out why the car is misfiring e.g too much fuel and is causing it to choke or too little and is trying to burn just air. Perhaps the pressure of the LPG system is at fault.

This is just my theory of course so don't take it as fact I could be way way wrong here.

Dec 6th, 2023, 10:11	#13
mcfe New Member Last Online: Today 21:38 Join Date: Apr 2019 Location: NoTown	I am guessing it drives fine on gasoline? To me it sounds like the car is adapting to the running of LPG and is detecting either too lean or too rich and is changing injection times WHICH ARE INTERCEPTED by the LPG computer, which affect your lpg system. That or the LPG system is doing some adapting of its own. I would look at STFT LTFT values just to verify between LPG and Petrol in real time of course. You need to figure out why the car is misfiring e.g too much fuel and is causing it to choke or too little and is trying to burn just air. Perhaps the pressure of the LPG system is at fault. This is just my theory of course so don't take it as fact I could be way way wrong here. Last edited by mcfe; Dec 6th, 2023 at 10:20.

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Dec 1st, 2023, 18:27	#11
mcfe New Member Last Online: Today 21:38 Join Date: Apr 2019 Location: NoTown	Spark energy is affected by battery voltage and rpm. On my s60 p2, there is a dwell time table in the ecu code. It affects how long the coil is charged and how strong the spark is based on Voltage and RPM.

Dec 5th, 2023, 09:00	#12
Jason t5 New Member Last Online: Dec 5th, 2023 09:00 Join Date: Feb 2023 Location: White British	I did wonder if it was a battery issue so I replaced it with a brand new one.. still having the same problem 😔

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