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Old 10-06-2015, 07:23 PM   #1
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Monaco Owners Club
Join Date: Oct 2012
Location: Glen Allen, Virginia
Posts: 187
L10 Injector Replacement

I've been bringing a 1991 40' Crown Royale Signature Series back from the dead. We picked the ride up for 7 grand and it was in great shape except for some delamination over the fridge (which we repaired already). The coach had new batteries and tires but the owner had let it sit for a year and a half with only 1/4 tank of fuel (we all know diesels love full tanks). On the trip home I was seeing some of the dreaded white smoke and the engine started missing at idle.

Long story short, changed fuel filters a couple of times and polished all of the water out of the tank but the miss remained. Instead of paying someone to diagnose and repair, I threw myself into this forum and a few others. Here are the steps that I used to repair:

  • I used a heat gun to take the temperature of exhausts ports at idle and found number six to be totally dead with no heat rise.
  • I removed the valve cover and unplugged each injector one at a time while the engine was running and verified that only cylinder six was not firing (the engine did not change when that cylinder was unplugged).
  • I then connected a light to the harness on #6 and saw the flashing when the engine was running (this told me that the ECM was trying to do it's job).
  • At this point I followed the procedure to remove the jake brake and pulled the injector.
The replacement injector was $279.65 with tax from Central Diesel in Richmond VA, 804-275-3900. They are awesome people to deal with and I highly recommend them. I installed it tonight in just and hour and a half and the coach is purring like a kitten again. Don't be afraid of injectors, they are just big ole spark plugs
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Old 10-06-2015, 07:47 PM   #2
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Monaco Owners Club
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Location: Buckeye AZ
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Great outcome. Thanks for the info.
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Old 10-06-2015, 09:12 PM   #3
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Location: Glendora Ca.
Posts: 1,439
Awesome!
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