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jillhop's avatar
jillhop
Explorer
Dec 04, 2014

E350 ignition coils

I have a fairly new-to-me 1998 Coachman motorhome on a 1997 E350 chassis. At the time I purchased it this past July, it was not running well (check engine light on) and had two bad coils, which were replaced (then ran great!). My mechanic commented (sort of joking, but also sort of not) that I should keep a spare in the vehicle, as more were likely to go. Well, last week it started running rough, poor power on the freeway, and the check engine light is on--another bad coil!

My question is, should I just bite the bullet and have them ALL replaced at this point? Seems like it might be cheaper/more dependable in the long run--no pesky labor charges to figure out which coil has gone bad! My main concern is to have a reliable vehicle. While I'm not doing any trips over the winter, I am planning a long (10 days, 800 miles in each direction) trip in the early spring.

21 Replies

  • I've read before that as the spark plugs wear down and the gap gets bigger; it puts more load on the coils and that's what kills them.

    How old are your plugs? What's the gap set too?

    If you get new plugs; set the gap at the smallest spec so as they wear; they last longer then setting the gap closer to being out of spec.

    Check on here for various brands and check prices on the coils that are out there: https://www.rockauto.com/

    Also check Amazon and ebay for coil prices.

    I'd personally put new plugs in and a fresh set of coils and keep the old coils as spares.