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New plugs/wires - sluggish

 
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Old 23 Jun 2014, 07:51 pm
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Default New plugs/wires - sluggish

I had a slight miss in my convertible a month or so ago and I think it tripped a cyl 3 misfire code for a while. I replaced the plugs (platinum gaped at @ .050") with Champion copper core gapped at .040". I don't have a miss, but it seems like it might be a little more sluggish than it was. Should I have used platinum or maybe gaped a little more?
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Old 23 Jun 2014, 07:56 pm
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Default Re: New plugs/wires - sluggish

I just worked with Chrysler on my spark plugs - if your PT is an NA, not a turbo, then you should gap at 0.040. If it's a turbo, 0.050. Now I had mine gapped at 38 but it didn't idle smoothly, but ran great on the 1/4 mile race track. I don't race anymore so gapping at 050 is a perfect idle and at around 80 mph it's running very smoothly.

So, gap at 40 should be good to go unless it's a turbo.

Oh, what kind of spark plug wires do you have? If they are factory they are likely 7.5mm in thickness, and they do NOT take to heat very well. Over time they tend to get somewhat stiff, then they delay the flash to the spark plug. I highly suggest to everyone, go for the 8.5mm plug wires, they tend to allow a faster spark and last longer.
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Old 23 Jun 2014, 07:57 pm
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Default Re: New plugs/wires - sluggish

They say between .40 & .50 is best.
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Old 23 Jun 2014, 08:53 pm
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Default Re: New plugs/wires - sluggish

You change the wires also? I always think it best to replace both at the same time, and get a good brand of wire, not stock ones.
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Old 24 Jun 2014, 12:28 am
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Default Re: New plugs/wires - sluggish

Quote:
Originally Posted by Fifty4F100 View Post
I had a slight miss in my convertible a month or so ago and I think it tripped a cyl 3 misfire code for a while. I replaced the plugs (platinum gaped at @ .050") with Champion copper core gapped at .040". I don't have a miss, but it seems like it might be a little more sluggish than it was. Should I have used platinum or maybe gaped a little more?
If you are using a Champion single electrode spark plug for any 2.4 engine the start gap should be .035-.042. If you feel like finding optimum gapping then you would need to increase the gap by .010 until you get and ignition misfire which you will hear in the exhaust tone of a "burble" sound at the tali pipe at idle or a misfire at higher engine operating speeds.. At that point you will want to reduce the gap down by .010.

The only consideration with a Turbo Charged or Supercharged engines may be a consideration for a different heat range which can only be determined by careful and experienced spark plug readings or by monitoring the EGTs (exhaust gas temperature)

Spark plugs and spark plug wire would not cause an engine to run sluggish unless something was measurable incorrect in which case your would have gotten an engine light and a DTC (engine code).
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Old 24 Jun 2014, 10:10 pm
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Cool Re: New plugs/wires - sluggish

My turbos have been gapped at 0.038; both ran/now run great with no sluggishness.
Might be something else.
How did it run before?
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Old 26 Jun 2014, 06:09 pm
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Default Re: New plugs/wires - sluggish

Mine, they put new plugs in and gapped at 0.050 and now it's sluggish as hecK!!!
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Old 26 Jun 2014, 06:13 pm
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Default Re: New plugs/wires - sluggish

Maybe Quicksilverdon should have waited a bit before giving you a like?

I wouldn't worry it is easy enough to change. You may even remember the match cover method of measuring?

Quote:
Originally Posted by Lion7718 View Post
They say between .40 & .50 is best.
who is them?
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Last edited by NitroPT; 26 Jun 2014 at 06:15 pm.
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Old 26 Jun 2014, 06:14 pm
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Old 26 Jun 2014, 06:17 pm
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Default Re: New plugs/wires - sluggish

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