I left another post about oil consumption but basically the V10 had zero oil on the dipstick after about 4500 miles. It was essentially 4 qts low-whether it was there to begin with I don't know. The weather royally sucked and it slipped my mind..the one time I don't check I get this surprise.

Anyway-will be monitoring oil this week. I also did a scan with a regular scanner and my Autoenginuity scanner

The PCV hose by all appearances has never been changed in 19 years-probably the PCV valve as well (it hadd 100k on it when I bought it and am now at 114k)
I bought the PCV valve and I ordered that hose assembly that has the coolant lines and the line into the plenum. It won't get here of 7-10 days.

On the scan:
It was showing misfires. It was subtle but once I saw the reading, I paid more attention and I could hear it from time to time. My scanners don't show the cylinders directly that misfired but it seemed some reading was a little different on 2 and 8-can't remember what it was.

Short term fuel trim bank one range was : had +12 , +13, +14 a few times over 3 minutes down to maybe a -6
Short term fuel trim bank two range was : had +9,10,11 down to a -6 over 3 minutes
To me, it was bouncing all over the place.

Long term fuel trim finshed at: Bank 1 -0.78 Bank 2 +4.69

MAF volts mostly around 1.1 -1.8 but some jumps to around 3.9 which coincided with acceleration
MAF rate(lb\min) was around 1.04 at idle at topped out at around 25 when I stomped on it

It did detect a vacuum leak in the evap system although my data stream file didn't captue it. I have gotten a number of P0455 codes(a large leak) over a year.
It will not trip a code but every so often but I guess there is a threshold for that. I've used 3 different new gas caps--once in a blue moon that light pops on but very very infrequently.

I'm hoping this all can be attributed to vacuum leaks. I don't know how to check the vapor cannister, purge valve and all that stuff. I don't even know where all the vacuum lines for the EVAP system are which I guess run from the gas tank to the evap cannister to wherever.

Any thoughts, tips or tricks are always appreciated

 

Change out your pcv and vacuum lines, which you are doing then go from there. Alot of those issue could be due to a vacuum leak (misses and A/F mixture).