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Old 11-07-2011, 12:16 PM
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Rough Idle ?

Just to clear things up this is on a 01 7.3 W/ 190,000 miles.

Recently I had a 203 degree t-stat installed w/ the dieselsite housing. This was done along with a full coolant flush & oil change. Coolant installed is the delo elc. Oil was changed to rotella 5W-40 full synthetic.

Before this was done the coolant was never changed, only added to. I ran royal purple 15W-40 and was satisfied. Just not satisfied with the price of the oil.

My first thoughts was the lighter weight oil. But from what I was told that should help smooth out the idle & give better fuel mileage. I rarely ever tow with the truck so I figured this oil would be perfect.

Now I'm wondering if the 203 degree t-stat is causing this.

Any suggestions?
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Old 11-09-2011, 04:18 AM
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Old 11-09-2011, 07:02 PM
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I wouldn't think that any of your new mods would be responsible for the rough idle. I also run the 203 thermo with no problems. Is it rough from right at a cold start up or even after its warm?
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Old 11-10-2011, 06:36 AM
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Quote:
Originally Posted by PolarBear View Post
I wouldn't think that any of your new mods would be responsible for the rough idle. I also run the 203 thermo with no problems. Is it rough from right at a cold start up or even after its warm?
It does it when it's warmed up as well. That's why I was thinking maybe it was the oil
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