Quote:
Originally Posted by Smallblock454
Hi JZeke,
My P1325 is intermittent. I couldn't track it down. I'm now on yearly oil and filter changes. The dtc came back twice in the last 4 years.
Did you check the camshaft positions with Piwis?
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I don't have a PIWIS, just a couple code readers but one of them does a great job reading cam positions, timing, deviations - everything that Durametric does. My deviations are ~1 degree on one bank and .6 on the other, and the cam timing on both sides (measured when hot) mirror each other perfectly.
So this season I ran a bottle of Techron full fuel system cleaner, which eliminated the passive P1325. Then I did an oil change with Mobil 1 FS 5W50 (Porsche's new recommendation for 986s amongst other older cars) and now it runs even smoother. I'm not sure what sort of debris was in the passage, but I want to believe that treating the fuel and then immediately changing the oil cleared it and the underlying cause.
But in terms of vibrations, I just had the headers replaced with a set of used ones from a car with 40k miles, and replaced the midpipes with straight pipes. The vibration change was radical! Seriously most of them are gone, with some remaining frequencies I think could be related to transmission mounts.