This past march I obtained another Geo Metro. This one was a 93 with only 52,000 miles on it. Auto working air and 35mpg in town. Paid $1,100 for it. Car ran well, but uses a little oil and had some minor to moderate pinging once warmed up.
Iam just finishing up 1,500 mile with auto-rx in the oil. I have also run FP60 for 1,300 miles and regaine for 200 miles I had cleaned out a plugged EGR intake port and that helped with the pinging by about 50%. I also checked the timing to ensure that it was at factory specs. Being cheap, and not wanting to run premium gas, I decided to do a piston soak before going into my auto-rx rinse phase. This way all the solvents in the oil will be change out before the rinse phase.
So here is what I did. I poured about 1oz regaine into each cylinder. let it soak for 30 minutes then used a foam bruch (kind to cleand tape heads with) to swish the regaine around in the pistons. I tested the foam brush first with regaine to make sure it wouldn't desolve in the regaine inside the piston. I used a mytivac pump to pump the regaine out. Then I repeated twice and am going to let the 3rd batch soak over night. Then on Monday, I will rotate the crank 180 degrees and repeat the process. The pictures show how dark the fluid was the first time I pulled it out. By looking thru the spark plug hole, you could know see some clean metal on the piston tops. I was surprised at how dark the fluid was..
I will update on Monday.
Iam just finishing up 1,500 mile with auto-rx in the oil. I have also run FP60 for 1,300 miles and regaine for 200 miles I had cleaned out a plugged EGR intake port and that helped with the pinging by about 50%. I also checked the timing to ensure that it was at factory specs. Being cheap, and not wanting to run premium gas, I decided to do a piston soak before going into my auto-rx rinse phase. This way all the solvents in the oil will be change out before the rinse phase.
So here is what I did. I poured about 1oz regaine into each cylinder. let it soak for 30 minutes then used a foam bruch (kind to cleand tape heads with) to swish the regaine around in the pistons. I tested the foam brush first with regaine to make sure it wouldn't desolve in the regaine inside the piston. I used a mytivac pump to pump the regaine out. Then I repeated twice and am going to let the 3rd batch soak over night. Then on Monday, I will rotate the crank 180 degrees and repeat the process. The pictures show how dark the fluid was the first time I pulled it out. By looking thru the spark plug hole, you could know see some clean metal on the piston tops. I was surprised at how dark the fluid was..
I will update on Monday.
