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Old 10-28-2004, 13:41   #1 (permalink)
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99 Navigator missing at idle .... ideas?

Hi .....

I recently purchased a 99 Navigator 4x4 with 74,000 miles from an original owner and love it. It has the 32 valve V8.

I have noticed it has a bit of and engine miss at idle. I ran some fuel injector cleaner through it with no benefit.

My guess is that the sparkplugs are original ...... so perhaps that is the first place to start? Should I use OEM plugs from Lincoln or is there a good after market brand?

Are there any other ignition or fuel delivery factors that I should look at while trying to eliminate the engine miss?

Thanks ...... Rob
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Old 11-28-2004, 09:33   #2 (permalink)
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Smile Re: 99 Navigator missing at idle .... ideas?

Quote:
Originally Posted by 99 Navi
Hi .....

I recently purchased a 99 Navigator 4x4 with 74,000 miles from an original owner and love it. It has the 32 valve V8.

I have noticed it has a bit of and engine miss at idle. I ran some fuel injector cleaner through it with no benefit.

My guess is that the sparkplugs are original ...... so perhaps that is the first place to start? Should I use OEM plugs from Lincoln or is there a good after market brand?

Are there any other ignition or fuel delivery factors that I should look at while trying to eliminate the engine miss?

Thanks ...... Rob
That's the first thing you need to do replace the spark plugs,make sure you use OEM s/plugs from motorcraft.
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Old 09-02-2005, 21:09   #3 (permalink)
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Re: 99 Navigator missing at idle .... ideas?

Bah to the oem plugs. Use any good brand name platinum plug. No need to pay for any of the "splitfire" "u-groove" or other high performance plugs as you don't need them and they serve no benefit to unmodified engines. (on a side not, "shitfire" plugs don't do anything beneficial anyway)

You can use autolite, motorcraft, denso, ngk, etc....

If you are going to do it yourself though, be ready for a project. There are some people that can do it without removal of the fuel rail, but most have to pull the rail to access at least the #6 plug
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Old 10-19-2005, 12:45   #4 (permalink)
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Re: 99 Navigator missing at idle .... ideas?

Quote:
Originally Posted by stang99x
Bah to the oem plugs. Use any good brand name platinum plug. No need to pay for any of the "splitfire" "u-groove" or other high performance plugs as you don't need them and they serve no benefit to unmodified engines. (on a side not, "shitfire" plugs don't do anything beneficial anyway)

You can use autolite, motorcraft, denso, ngk, etc....

If you are going to do it yourself though, be ready for a project. There are some people that can do it without removal of the fuel rail, but most have to pull the rail to access at least the #6 plug
If you use Autolite, you MUST use double platinum plugs. Ford Requires it. And it is a pain to get to the number 4 plug, but I did the entire tuneup without removing the fuel rail. Invest in 2", 4" and 6" extensions and a couple of universal joints to get the job done. The spark plugs are difficult!!!
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Old 12-09-2005, 13:47   #5 (permalink)
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Re: 99 Navigator missing at idle .... ideas?

Quote:
Originally Posted by 99 Navi
Hi .....

I recently purchased a 99 Navigator 4x4 with 74,000 miles from an original owner and love it. It has the 32 valve V8.

I have noticed it has a bit of and engine miss at idle. I ran some fuel injector cleaner through it with no benefit.

My guess is that the sparkplugs are original ...... so perhaps that is the first place to start? Should I use OEM plugs from Lincoln or is there a good after market brand?

Are there any other ignition or fuel delivery factors that I should look at while trying to eliminate the engine miss?

Thanks ...... Rob


I had the same problem at idle and when running, went to advance to put it on the machine, said spark plug #1 misfire, replaced plug ran ok for 30 minutes , went back next day same reading, I then replaced the wire going to that plug and it fixed the problem!
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