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Rough idle(after new spark plugs & wires)

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Old 11-26-2013, 04:02 AM   #1
Bosshogoutlaw
 
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Default Rough idle(after new spark plugs & wires)

So it getting cold out so i decide to get my friend to help me install my new spark plugs & wires on my 2005 v6 stang. I went with the NGK 7159 TR55-1GP Single Platinum Spark Plug & the taylor street thunder 8mm spark plug wires. Everything went well besides three things that concerns me. For one we didn't use any anti seize nor any dielectric grease on the spark plugs & wires because my friend said it ngk didn't call for it. After i left his house out i notice my car dropping in rpm from 750 to 500 rpm while stopped at the light but is sounds like its gonna shut off on me or something. Also Im hearing a weird bumping noise coming from the muffler. But while Im driving its fantastic. I notice a improvement in throttle response it just when im idling that really has me concerned. Oh & also we didn't space the new spark plugs either but where gonna do so tomorrow to .65. So plz ANY insight would be great
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Old 11-26-2013, 05:00 AM   #2
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Ford's don't like change in plugs, any mechanic can attest to that, that said NGK is a great performance plug. Hopefully gapping them and a little grease on the threads will fix your rough idle. The grease will help you get them out the next change. I'm searching for the right NGK plugs for my 3.7 motor soon.
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Old 11-26-2013, 05:37 AM   #3
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always put anti seize, also it is possible that some of the plugs were not tightened all the way
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Old 11-26-2013, 08:02 AM   #4
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I suggest going back to the OE COPs and see if the rough idle and "thump" (which could be a low idle miss) goes away. The OE COPs are pretty decent IMO and aftermarket COPs have had their share of issues.
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Old 11-26-2013, 08:45 AM   #5
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@Nuke.. no COP's on the 4.0
@OP Make sure you have the plugs/coil wired in the correct order.
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Old 11-26-2013, 10:02 AM   #6
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Id check all the sparks . Make sure the wires were used properly . I think they were different lengths for a reason . Check to make sure everything is snug tight . Change your fuel filter if need be . Then I'd look into your electrical. Right now I have a slight rattle at a stop sign in drive . It's either my tranny mounts or my trannys going out. Alternators are known to act funky especially the oe one . Might need a swap
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Old 11-26-2013, 10:32 AM   #7
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@GrayPony I took the wires out one by one so we wouldn't get them confused so that's not a issue

@JJHoover soon has i get a chance were going to check that later on today

@IvanRad I was contemplating the same thing early this morning while i was driving to work but i also was thinking that the car might have to relearn idle since the "Taylor Street Thunder" are a low resistance wire than the OE.
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Old 11-26-2013, 12:01 PM   #8
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Quote:
Originally Posted by GrayPony View Post
@Nuke.. no COP's on the 4.0...
I was wondering about that as I typed it. My wife has her 4.0 with her at work and I never really took notice before.

I'd still change back to the OE wires just to eliminate that from the list of possibilities. Although it seems like an unlikely coincidence, I'd clean the TB and check to see if the fuel filter has been replaced within the last 30k miles.
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Old 11-27-2013, 01:41 PM   #9
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I have NGK Iridiums and the Taylor 8mm wires and they have been great for me. Put them on at 65,000 miles, now have 72,000, idles perfectly smooth and response is great.

I would suggest you gap to the OE specs of .052-.056, personally i always go to the middle of the range so I gap .054 here. .065 is way big. And definitly use dielectric tune-up grease it will help with the conductivity.

Gapping them is always a must IMO even if they say pre-gapped from the manufacture. I always seem to have to adjust them slightly.

And yes use some anti-seize on the threads

After doing these things I would be supprised if it doesn't help your situation
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Old 11-28-2013, 12:32 AM   #10
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Its been raining for the past few day so I haven't been under the hood yet. But last night when I got off work I made the stang relearn idle...ac max while idling for five minutes ac off while idling for five min then I drove ten miles on the highway. I drove home park the car an got up the next morning with a check engine light on. I never been so happy to see it in my life lol. Took it to advance auto to diagnose an what do they find? Mis fire cylinder 4...FINALLY I can drive with peace at mind again
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Old 11-28-2013, 12:42 AM   #11
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Quote:
Originally Posted by DenIs2Fast4U View Post
I have NGK Iridiums and the Taylor 8mm wires and they have been great for me. Put them on at 65,000 miles, now have 72,000, idles perfectly smooth and response is great.

I would suggest you gap to the OE specs of .052-.056, personally i always go to the middle of the range so I gap .054 here. .065 is way big. And definitly use dielectric tune-up grease it will help with the conductivity.

Gapping them is always a must IMO even if they say pre-gapped from the manufacture. I always seem to have to adjust them slightly.

And yes use some anti-seize on the threads

After doing these things I would be supprised if it doesn't help your situation
Hey hopefully with my either changing out the spark plug or the wire(which ever bad) with gaping all the spark over again the adding anti seize with some dielectric grease will stop my low rough idling
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Old 11-28-2013, 08:21 AM   #12
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You don't "need" anti-seize or dielectric grease. While there are clearly good reasons to use both, you shouldn't have a problem with new plugs and wires because you didn't use them. Either one or more of your plugs is not properly gapped or not not fully seated or one or more of your wires are not fully seated or is just plain bad. If it were me, I'd start with replacing your new wires with the old (unless you knew them to be bad). If I had to guess, however, the easiest mistake to make when replacing plugs is to cross thread one and assume it's seated when it feels snug.
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Old 11-28-2013, 10:49 AM   #13
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Quote:
Originally Posted by Bosshogoutlaw View Post
Its been raining for the past few day so I haven't been under the hood yet. But last night when I got off work I made the stang relearn idle...ac max while idling for five minutes ac off while idling for five min then I drove ten miles on the highway. I drove home park the car an got up the next morning with a check engine light on. I never been so happy to see it in my life lol. Took it to advance auto to diagnose an what do they find? Mis fire cylinder 4...FINALLY I can drive with peace at mind again
Disconnect the battery (unless you did this for the wire/plug change)
and REALLY make your PCM relearn the idle strategies.
Adaptive learning is what its called, I believe.

btw, the coil pack sparks TWO cylinders at once the
the need for only 4 wires on the power connector instead
of 7 (one ground)

One cylinder sparks at TDC compression stroke
and another also sparks at TDC on the exhaust stroke.
Go figure.
Tachs and shift lights need to be set on 3 cylinders
instead of 6 for them to work correctly.
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Last edited by 157dB; 11-28-2013 at 10:54 AM.
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Old 12-02-2013, 09:43 PM   #14
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I'd like to get a new set of plug wires for my 4.0 (orig. factory still in at 75,000 mi), and I'm looking for same size/diameter wires so I can use factory wire looms. Same size but either blue or red. Any suggestions? And what is the MM size of my factory wires?
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Old 12-03-2013, 12:05 PM   #15
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Quote:
Originally Posted by 157dB View Post
Disconnect the battery (unless you did this for the wire/plug change)
and REALLY make your PCM relearn the idle strategies.
Adaptive learning is what its called, I believe.

btw, the coil pack sparks TWO cylinders at once the
the need for only 4 wires on the power connector instead
of 7 (one ground)

One cylinder sparks at TDC compression stroke
and another also sparks at TDC on the exhaust stroke.
Go figure.
Tachs and shift lights need to be set on 3 cylinders
instead of 6 for them to work correctly.
Wait so how does that work? Do i install #1-#3 new sparks & wires...firer it up then install #4-#6?
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Old 12-03-2013, 12:05 PM
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