I have a 2011 Chevy Spark LPG/Patrol BiFuel M300 from the Netherlands. I’m dealing with a P0172 code (Bank 1 runs rich) that’s traced back to the LPG system. I want to check everything in my engine that could cause the LPG system to overflood. Any tips on what I should look at? Here’s a look at the engine: IMG-20250121-WA0001-1 hosted at ImgBB — ImgBB
Make sure to check the air filter as well. A clogged filter can throw off the air-fuel mixture.
Have you looked at the fuel pressure regulator? If it’s faulty, it could cause an overpressure situation.
Don’t forget about the MAP sensor. If it’s malfunctioning, it can lead to incorrect fuel delivery.
Also, check for any vacuum leaks. They can cause a rich condition by affecting the air-fuel ratio.