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There's really no set mileage. I've replaced mine twice in 240,000 miles. My original Ford factory ones were CAV (Engilish pieces of crap) that needed replacing at 74,000 miles with Stanadynes. The Stanadynes lasted until 206,000. I replaced them a few years ago to eliminate a rough idle. It's a good idea to have new ones pop and spray tested before installing. I did not and had a worse idle than before so I had to pull them, have them tested, all 8 were out of specs, sent them back, the new set checked out, been good ever since.
Last edited by LMJD; 11-03-2009 at 01:24 PM.
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