Re: What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

The service guide for my '98 Ford Club Wagon says that my spark plugs should

>be replaced at 100,000 miles. >With 75,000 miles on the van now, I've got mysterious stalling problems when >approaching an intersection; i.e, when decelererating. > >I strongly suspect the engine is running lean. The leanness is not >overwhelming, however. There is some pinging, while on the freeway, >especially during the warmer times of the day, that was never evident >before. The timing is OK, according to the OBDII break out. > >Nevertheless, it would probably be a good idea to change the spark plugs. >After all, a few misfires, especially as low idle, might cause an engine to >stall. So I looked at my service guide, and sure enough, it says I'm early >if I only have 75K miles. But wait, there is a "severe duty schedule" that >says the plugs should be changed at 60,000 miles. > >This van gets a great deal of work on short-haul trips. I have heard that >this is hard on the engine lubricant. Would it wear spark plugs >prematurely? Why? Because they're "cold" much of the time? Does "cold >combustion" age spark plugs at an accelerated rate? > >I would especially appreciate any shared experiences on this matter. >

severe = IE delivery van, police car etc something someone who does not own it bags on everyday the average guy is light duty

hurc ast

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firefox7620
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