97 Sebring spark plugs???

1997 MITSUBISHI
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TOPHER441970
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I put Autolite double platinum plugs in my 1997 Sebring convertible, 2.5L V6, what a NOT so fun job that is... Are these plugs right for this car? I seem to be getting a bit of misfire at idle. The motor makes the car shake a tiny bit. you know what I mean. ;-) Being it's a Mitsubishi motor should I have used NGK plugs? I had an issue a while ago when I put Bosch platinum +4 plugs in my Cutlass Ciera and it ran crappy, then I put delco's in it and it was perfect. Any help would be great.
May 13, 2007 at 4:59 PM
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I prefer Autolites, but will use NGK in certain applications. But you should put the same as what you took out. That is plaitinum, double platinum, irridium, regular. Was there any oil present in any of the spark pug holes? How did the wires look? Did you use delectric grease on the wires?, IS there any routing problems with the wires?
May 13, 2007 at 5:49 PM
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TOPHER441970
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I replaced the wires at the same time as the plugs, routed them exactly the way the old ones were. No oil on the plugs when I pulled them, used dialectric grease, anti sieze, all that good stuff. It had platinums in it when I took the originals out. There was no brand mark, just the plug part number. And naturally I already threw the old ones out the day I did the plugs.

I put a new distributor in it also, I got the old one wet and killed it. That's why I changed the plugs to begin with, I was getting no spark.

I think I may go get another set of plugs (NGK) regular platinums and see what happens. It's the thought of pulling that plenum off again to replace the back 3 plugs that I dread....
May 13, 2007 at 7:11 PM
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I wonder if there may be any codes in the computer, or if the tremble is necessarily form spark, but maybe a carbon build up.
May 13, 2007 at 8:50 PM
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TOPHER441970
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I pulled a scan on the car with my obd-11 scanner and I got nothing at all. All clear. I did notice however that it does it less after it's driven a few miles??? Not gone, but better than when you first start it. I'm sure with an OBD 11 system a misfire will give you a code right? I pulled one on a car once (Hyundai sonata), and it told me which cylinders were misfiring.
May 13, 2007 at 9:00 PM
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A misfire would show up as a po300 or similiar, but didn't hurt to check. If the scanner has the capability of being a scope, you could scope the engine to see which cylinder is not quite up to snuff.
May 13, 2007 at 9:24 PM
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TOPHER441970
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I did the fun job of replacing those Autolites with NGK laser platinum plugs, and the car idles perfectly. I used the plugs the cars emission control label says to use NPR5G-11 plugs(NGK platinums).

Man.... Chrysler should have made a better design with the 2.5 motor. Having to take the plenum off to remove the 3 rear plugs is nuts. Dumb design.
May 20, 2007 at 6:31 PM
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Cool!! Congrats on the success. It's funny, Ya really don't want to condemn the plugs, but some motors are more particular.
May 21, 2007 at 7:26 PM