Posted 14 November 2011 - 01:38 AM
I took a small day long trip with the car today, we drove up as high as we could (until we hit snow) on Mount Saint Helens in Washington state, the round trip was 340 miles, (we took a few side trips as well.
the car is running 100% better, I ran a can of seafoam through the gas tank, as well as a quart of marvel mystery oil in the crank case, and this was after letting the passenger side cylinders soak in oil for a couple of days last week.
The compression readings have been all over the place since we got the car running, but after doing a compression check tonight after I got back home from out tip, the numbers are looking much better.
The compression check I did a couple of weeks ago read as follows:
Drivers side back cylinder (closest to fire wall) 175 lbs
Drivers side front cylinder (closest to radiator) 115 lbs
Passenger side back cylinder (closest to fire wall) 125 lbs
Passenger side front cylinder (closest to radiator) 135 lbs
The new readings I got tonight read as follows:
Drivers side back cylinder (closest to fire wall) 130 lbs
Drivers side front cylinder (closest to radiator) 175 lbs
Passenger side back cylinder (closest to fire wall) 130 lbs
Passenger side front cylinder (closest to radiator) 130 lbs
I have no idea why that front cylinder when up to 175 from 115, and I have no idea why that back cylinder dropped from 175 to 130, but given the fluxuation, and now the 3 matching cylinders, and the better running engine in general, I’m inclined to believe that the compression is going to stabilize between the 4 cylinders over time.
I’m going to run the Marvel mystery oil in the crank case for a few more days to let it do a bit more cleaning before I change the oil.
Speaking of oil …I discovered something else while out on the trip, I’ve been chasing the wrong oil burning problem, on this trip, I drove a total of 340 miles, and burned ¼ of a quart of oil.
I found that while I thought the car was burning oil, (blow by past the rings) I was wrong, it’s been sucking the oil through the vacuum system and into the intake.
I found this after I soaked those passenger side cylinders last week, after the soaking, the car had considerably more power, and I found that in order to hold any given speed limit, I had to push very little on the throttle, before the soaking, in order to keep up with traffic, I had to have the throttle floored pretty much any time I was on the freeway, and I always smelled burnt oil, and assumed that it was blowing past the rings.
Since I’m no longer holding the throttle down to the floor to keep up with traffic, I’ve noticed that the burnt oil smell has gone away, and when I check the oil, the oil level hasn’t budged.
So today while out on our trip, I put my theory to the test, when I got to the mountains, I pulled over before I started the climb, and checked the oil, it was full, I then kept it floored as much as possible over about a 10 minute stretch, when I got to the top of the mountain pass, I pulled over and checked the oil again, I opened the hood and smelled burnt oil, and noticed I was down ¼ of a quart.
I finished the trip, without pushing the car, and when I got home, I checked the oil again, after 340 miles, and I’m still down ¼ of a quart, that’s the oil I lost going up the mountain when I had it floored.
So, instead of addressing a ring sealing issue, I need to be addressing a vacuum issue, I’m not sure where to start with the oil being sucked through the vacuum lines, but I’ll have to find a way to stop it.