Rough running when cold
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Thread: Rough running when cold

  1. #1
    oreo382 is offline [OP]
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    Rough running when cold

    After I filled my tank with local Co-op diesel on May2 it has been running really rough until warmed up.It misses,stumbles when trying to accelerate and the engine vibrates at idle.The mileage has gone from 31 to 25mpg (all city). It seems to point to fuel but i'm wondering what issue would the fuel have? water? low cetane? winter blend? I usually use Petro Canada diesel and have had no problems up till this last fill.There is no check engine light.

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  3. #2
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    You could try opening the drain valve on the fuel filter to see if it's all water, but I can't imagine that is really getting in the fuel, as that is the purpose of the fuel separator.
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  4. #3
    oreo382 is offline [OP]
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    Update.A rep from Co-op emailed me and said they take fuel quality issues very seriously.They will get the stn. manager to test the tank for water and also check the pump filter.In addition he said if I still have that fuel in my tank (which I do) they can test that (probably depends on the station's findings).Overall i'm very impressed with the concern they have expresssed.He also let me in on a little info regarding diesel fuel,he stated that the fuel delivered to co-op is the same as that delivered for Shell and Petro Canada.So much for arguments which fuel is better.Anyway I hope this isn't some issue with some component on my car after complaining about fuel.I guess once I hear their findings I will be able to know that point.

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  6. #4
    4th Gear Snipesy's Avatar
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    Quote Originally Posted by MP81 View Post
    You could try opening the drain valve on the fuel filter to see if it's all water, but I can't imagine that is really getting in the fuel, as that is the purpose of the fuel separator.
    I’m not really sure how much water the separator gets each pass but I’m sure it’s nowhere near all of it.
    A hella surreal diesel Cruze.

  7. #5
    oreo382 is offline [OP]
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    Update.The rep said they found no water in their diesel tanks.Last evening I took my grandson to a soccer game out of town.1/2 hr. highway drive.Car coughed a bit next morning but nowhere near previous days.Maybe the thing is coked up,mostly city running this winter.Car was usually run for a good 1/2 to 1 hr. but there were quite a few 10 min. trips too.Time to get out and give it a good beating and see what happens.

  8. #6
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    Put some 911 in the tank.

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