Well, I did a compression check on my 1991 Sentra SE yesterday. My car has 180K miles on it. My results were the following:
205, 205, 195, 200.
The FSM states standard is 192, minimum is 164, and difference between cylinders is less than 14.
It appears I have some carbon buildup as my compression numbers are TOO high. I did a carbon soak about 30K ago. The high compression is probably why I get some pinging even on 92 octane gas and timing at 15 degrees.
Any suggestions for removing that carbon w/o taking the motor apart?
205, 205, 195, 200.
The FSM states standard is 192, minimum is 164, and difference between cylinders is less than 14.
It appears I have some carbon buildup as my compression numbers are TOO high. I did a carbon soak about 30K ago. The high compression is probably why I get some pinging even on 92 octane gas and timing at 15 degrees.
Any suggestions for removing that carbon w/o taking the motor apart?