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Old 07-23-2008, 06:42 PM   #800 (permalink)
DoctorDex
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Join Date: Jul 2005
Location: Edmonton, AB
Drives: '91 VR4 - RIP
Trader Rating: (16)
DoctorDex is an unknown quantity at this point
Default Re: Lean Misfires at 2700-2800 rpm

I just got my oil analysis results back from blackstone. These results were sent away ~ 2 weeks before I destroyed my motor.

It appears the high levels of iron in my oil essentially fixed itself, therefore, this was not related to the missing. The only difference between then and now is that I recently switched to Amsoil 20W50 full synthetic racing oil. Interestingly, enough wear characteristics were improved across the board for all indicators (Amsoil 20W50 > Royal Purple 20W50 > Mobil1 10W30). The only negative in my report was that I had 2.3% fuel dilution in my oil, which effectively made the 20W50 into 10W40. I attribute this to the recent development of an extremely rich idle condition that occurs only when the car is _hot_. I have been unable to come up with an explanation of why it has been occurring and I am unsure as to whether or not it is related to the misfire problem, or if it is just another red herring. Hopefully I'll be able to come up with the cash for an AEM by spring, along with the money for a shortblock, heads and transaxle rebuild. Talk about a money pit.
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'91 VR4 - Rebuild in progress: Mods TBA.
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