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post #1 of 4 (permalink) Old 10-09-09, 08:18 PM Thread Starter
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03 navigator rough idle at stops

2003 navigator w/ 60k on it, lately when i get to a red light i feel a vibration in the vehicle, more so on cold days, but never during acceleration or any other time, just when in gear and stop... any ideas where to start??

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post #2 of 4 (permalink) Old 10-09-09, 09:22 PM
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Re: 03 navigator rough idle at stops

There's an extra load at idle and in gear so an engine miss will be felt easier. If you haven't replaced the spark plugs, this would be a good time to do it. There's a possibility that one of the coil packs is bad. It will eventually cause a check engine light and code.
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post #3 of 4 (permalink) Old 10-09-09, 11:54 PM Thread Starter
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Re: 03 navigator rough idle at stops

thank you for the reply, I will look into changing the plugs but how would a bad coil pack be detected? my friend suggested a vacuum leak? is that also a possibility? if so, how would one diagnose?
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post #4 of 4 (permalink) Old 10-10-09, 08:55 AM
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Re: 03 navigator rough idle at stops

A vacuum leak is rare on them. To check a coil pack, you can umplug one injector at a time and see which on doesn't make a change, then switch it with another one and se if it move to the new location. If it's in a hard to get to location, move it to an easier place. See if the miss moves with it. You can usually feel a miss just setting there and not in gear. Also look at the rubber boots to make sure they aren't cracked causing a spark jump. When you change the plugs, make sure you use anti-sieze and a torque wrench. too tight and the cyl. head exands and pulls them out. If you have 5.4, be very careful, the plugs sometimes brek and special tools are needed.
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