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11-13-2011
Wow...I hope not...I checked out the manual this afternoon and it says they recommend 91 but could run mid grade or regular unleaded rated at 87 but acceleration would be degraded. It does say not to use below 87. Would a compression test on #4 show the chip if its there?
11-13-2011
Running 87 in a 04+ is one of those "no station has 89+ available" kinda things. If it's available to you, run the highest octane possible.Originally Posted by ThomasJ2352
11-13-2011
Yes...cause if the piston chipped, it will most likely damage the valves and they wont seal. You should see a noticeable drop in pressure, if thats the case.
11-13-2011
Ok...just went out to do the compression test on #4...when I tried to remove the plug it was looseBeen changing plugs for 40 years and rarely forget to tighten one...cant remember the last time if ever. When I got it out a chunk of the tip was gone as was the center electrode...dropped a replacement plug in and its now back to being the rocket in acceleration but it still idles badly...now I'm getting multiple cylinder misfires...it doesn't feel like its misfiring on acceleration but it sure feels like it at idle.
Now maybe the clogged CAT? Any way to test it before plunking down $600 for a new one?
Any more ideas?
BTW, really appreciate your suggestions.
Tom
11-14-2011
Did it look like this?
This was mine...I figured it was a chipped piston, but after a borescope session, piston was fine. You didnt say if the compression was good.
11-14-2011
Your holding my plug! I was so anxious to try it with a new plug I forgot to give the compression a go...in retrospect I need to do that.
Regarding a CAT...I can only get it from a dealer here in Calif...not allowed to
buy a used one and auto-parts stores don't carry em for that new of a car.
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