Vehicle only running on two cylinders

1991 SUBARU LEGACY
229,000 MILES • 2.2L • 4 CYL
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SLOTCARKEN
  • MEMBER
  • 1 POST
When idling when it's running I take the air filter off it shuts off. runs at 1,500 rpm's and above. I have replaces the ECM and the coil pack terminal. it runs on 1 and 2 but not 3 and 4 I also.
Dec 15, 2019 at 5:54 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Hi,

Have you checked to see if there is spark and fuel to the affected cylinders? Also, have you checked for a timing belt issue?

First, check to see if cylinders 3 and 4 are getting ignition spark.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

If they are, remove the spark plugs and check condition. If they are wet, let me know.

Next, if they are wet and you do have spark to the plugs, check engine compression. Here are a couple links to help:

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

Do these things and let me know what you find.

Joe

Dec 15, 2019 at 11:26 AM
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