Doosan G20E-5:
Trim Valves

This unit was running rough. So far we've replaced the plugs, coils, mixer, regulator and vapor hose. It runs great if trim valves are disconnected but as soon as you plug the trim valve connector in it has a horrible idle. If I bypass the valves and leave them plugged in it runs great but the check engine light comes on. Any tips or knowledge on why the trim valves would cause such a rough idle would be great! Both trim valves have been replaced.
  • Posted 17 Apr 2017 23:15
  • Discussion started by jeremy_u
  • Louisiana, United States
Showing items 1 - 1 of 1 results.
When you disconnect the trim valves the truck is designed to run rich so that's why it runs better-more fuel. I would check for a vacuum leak on the hoses. You can double check those FTV's with an ohm meter (26-28 ohms) and you should not be able to blow through them.
  • Posted 28 Apr 2017 06:05
  • Reply by sirthor1881
  • Georgia, United States

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