1999 Navigator missing
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Joined: Nov 2008
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1999 Navigator missing
I have a 1999 Navigator that misses really bad when I reach 30-55 mph. I have read on this forum how to change the spark plugs.
Is there a way to find out if one of the coils is bad without driving the truck, because it does not miss until I reach 35 mph?
Is there a way to find out if one of the coils is bad without driving the truck, because it does not miss until I reach 35 mph?
Freshman User
Joined: May 2007
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For me, when I've had any vehicle miss including my 2000 Expy it was a coil pack. I've never had one miss becauase of a plug. I know it happens, but for me I would look at the coils. Easiest way, (still a pain in the butt), is to purchase one new coil. Start by putting it in one of the easy to reach coil spots. Drive it, if the problem continues take the coil you just took out and replace the next coil in line and drive it. Continue this until you've replaced a coil and the problem goes away.
The back coil on either side of the engine can be a pain to get to, but it can be done. That is why I start with the easy ones and elliminate them first. No point replacing the back one to find out later it was one of the easy ones.
The back coil on either side of the engine can be a pain to get to, but it can be done. That is why I start with the easy ones and elliminate them first. No point replacing the back one to find out later it was one of the easy ones.
Post Fiend
Joined: Aug 2002
Posts: 17,334
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From: PA
Go to Autozine or your local parts store that won't charge you to plug into their little computer to see if its throwing a code. They won't always throw a code (as in my case), so I just replaced all of my COPs and I got a rid of my miss.
New User
Joined: Jul 2008
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Where's the best place to get those coils at? Last time I went to Summit they had some for about $380???? I think they were made by Mallory.
Fleet Owner
Joined: Apr 2008
Posts: 24,322
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From: 0,0,1
You can get a set of 8 off eBay for $110 including shipping. Many of us here have installed these without issue.
http://cgi.ebay.com/ebaymotors/8-IGN...1%7C240%3A1318
http://cgi.ebay.com/ebaymotors/8-IGN...1%7C240%3A1318
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