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Old 09-16-2021, 07:01 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 45,314
 

2003 L-Series 3.0L Sedan
Default Re: Intermitent Starting

You didn't mention if this problem is a no start/dead silence or starter runs and cranks the engine but engine won't fire up. The former relates to battery, battery cables, their connections and starter. The latter may be related to the original coolant sensor failing.

Did you replace the original coolant sensor like you did on your '97? All original round nosed coolant sensors tend to fail by cracking its resin tipped nose with most running rich fuel mixtures all the time. Cold engine startups aren't noticed but warm engine starts may have too rich a mixture when leaner mixtures are needed for warm engine starts.
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