First, I am not a mechanic, and more than that, I sure don't know how LPG fuel systems work. So, the following may be far off the mark.
Can someone sniff this exhaust? Does it smell like antifreeze or does it smell like rich fuel?
If antifreeze, consider where the leak might be. Head gasket problem? Coolant system pressure check. Is there oil in the coolant or coolant in the oil? Pull the spark plugs & inspect the chamber if you have a camera. Is one cleaner than the others? Etc.
If fuel, is there a pressure reducer valve somewhere that might be leaking up when the car is shut off? Check pressures when the car is shut off & compare with specs.
Is this a throttle-by-wire car? Maybe the throttle plate is getting stuck - clean it with throttle body cleaner and swabs if it's sticking. Or/and, check the idle air control valve for stuck condition, if equipped.
Good luck, let us know if/when you solve it!
Can someone sniff this exhaust? Does it smell like antifreeze or does it smell like rich fuel?
If antifreeze, consider where the leak might be. Head gasket problem? Coolant system pressure check. Is there oil in the coolant or coolant in the oil? Pull the spark plugs & inspect the chamber if you have a camera. Is one cleaner than the others? Etc.
If fuel, is there a pressure reducer valve somewhere that might be leaking up when the car is shut off? Check pressures when the car is shut off & compare with specs.
Is this a throttle-by-wire car? Maybe the throttle plate is getting stuck - clean it with throttle body cleaner and swabs if it's sticking. Or/and, check the idle air control valve for stuck condition, if equipped.
Good luck, let us know if/when you solve it!
