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Old 01-07-2020, 07:56 PM   #7
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,624
 

2003 L-Series 3.0L Sedan
Default Re: 365,000 plus just died

1-engine or xmission whine?

2-black smoke can be associated with rich fuel running but what are the chances of well worn injectors allowing more fuel or a well worn fuel pump still supplying operating pressures to create a rich running condition?

3-pressing the gas pedal down further for starting can be interpreted in two different ways, lean fuel mixtures or possibly richening fuel to startup. Every EFI system has one undeniable startup characteristic - the ability to startup in hot summer or freezing winter without touching the gas pedal. Once the gas pedal is needed to startup, something's wrong.

With 365k miles and no mention of maintenance done over the years, guessing is all anyone can do here.

4-what's fuel pressure?

5-spark plugs replaced at recommended intervals?

6-fuel filter replaced every 100k miles?

7-is this car still on its original exhaust system? If original, there may be a possibility of the catcon disintegrating internally, blocking off exhaust flow and creating the equivalent of engine constipation by severely restricting exhaust flow to prevent normal engine running. The simplest test for a blocked exhaust system; remove the upstream exhaust manifold mounted O2 sensor to allow an alternate exhaust hole and startup.

I don't think this is a timing chain issue.

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