Saturn check engine light question:

This Saturn check engine light came when the engine has a miss all the time and scanning for the fault code, I got P0301 misfire at cylinder #1. My daughter just bought this 1999 Saturn and has a 4 cylinder motor on it. When I did a quick tune up, these are what I found:

When I tested the engine for vacuum leaks, I did not find any and blocking the throttle body air intake passage, the engine quit which to me indicates no vacuum leak. What other tests can I use to fix this Saturn check engine light fault code?

Saturn check engine light ATS suggested fixes:

When testing this Saturn check engine light misfire code, you should also try the following:

Sometimes, to get an accurate status of the engine condition, you need to performed a cylinder leakage test for the engine. This test is more accurate than compression test and will give you an exact picture of the cylinders. A normal cylinder leakage test is around 10 to 30 percent. Any reading higher than this can indicate a faulty cylinder valve which otherwise cannot be detected during routine engine check ups.

ATS TIPS:

You can get a one on one online assistance on the above tests so you can do it properly. This is especially important when you need to know the various Saturn engine specifications which you need to conduct the test. Feel free to leave your other ATS questions on the comment box below.