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Old 06-16-2020, 03:04 AM   #6
TimS
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Join Date: Dec 2017
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You need to check the fuel pressure. I had the same issue which slowly got worse into the winter. I thought that it could be the idle valve and maybe it was gummed up and slow to adjust to the low cold idle. On a whim I finally checked the pressure and it was really high. Tried another WUR that I had and that fixed it.
I read here somewhere that some injection cleaner may help clean out the WUR. I would like to put it back on and run some cleaner through it.

High fuel pressure is leaner. The wur starts with a lower pressure and then as if warms up the pressures goes up.
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