Engine idles rougher when warm than when cold - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 07-15-2019, 10:50 AM Thread Starter
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Engine idles rougher when warm than when cold

Just wondering why my engine would idle rougher after it warms up? When I start the truck it has a perfect idle but after it reaches the operating temperature it shakes the inside of the cab just a little bit. It's not bad and it doesn't sound like it's missing but I just wish it was a bit smoother.
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post #2 of 6 Old 07-15-2019, 05:28 PM

 
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Sounds like you have a bad injector or two. Hot oil = thin oil. With bad/questionable orings the oil can leak by internally much easier and cause weak injector.
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post #3 of 6 Old 07-16-2019, 06:29 AM Thread Starter
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I was afraid of that, especially since it has a new CPS, IPR valve, and new ICP.
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post #4 of 6 Old 07-16-2019, 09:29 AM Thread Starter
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I'm guessing that even though the truck runs great when you give it a little throttle it could still be the injector? It runs great going down the road too, but it has started to put out a little more black smoke than normal when getting on it. The truck has 220,000 miles on it.

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post #5 of 6 Old 07-16-2019, 03:27 PM

 
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Quote:
Originally Posted by Buddylee View Post
I'm guessing that even though the truck runs great when you give it a little throttle it could still be the injector? It runs great going down the road too, but it has started to put out a little more black smoke than normal when getting on it. The truck has 220,000 miles on it.
It'll run fine going down the road as there really is very little load on the engine, and the PCM isnt calling for much ICP pressure to run the injectors. Add a 10k trailer and go up a hill for 5 miles and then you will see the difference.

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post #6 of 6 Old 07-17-2019, 05:24 AM Thread Starter
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That makes sense, thanks for the feedback
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