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john -aka eauto
john -aka eauto, ASE Certified Technician
Category: Subaru
Satisfied Customers: 15075
Experience:  15 years as a auto tech
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I have had a muffler shop look at the cat but with 12and 4

Customer Question

I have had a muffler shop look at the cat but with 12and 4 misfiring they don't see it as the cat.my engine light has gone off for a couple of hours and then comes back on. The light has been off now for a full day . I put she'll premium in it
Submitted: 1 year ago.
Category: Subaru
Expert:  john -aka eauto replied 1 year ago.

The plug wires should be re checked...factory subaru ones make a difference..and compression should be checked

Expert:  john -aka eauto replied 1 year ago.

has anyone checked compression or a leak down test to verify internal engine health

Customer: replied 1 year ago.
My car is being checked by Subaru Monday when finished I will give you results
Expert:  john -aka eauto replied 1 year ago.

Great

Expert:  john -aka eauto replied 1 year ago.

well how was subaru

Customer: replied 1 year ago.
The Subaru mechanic checked the wires and found that the tuneup mechanic used I think soap on the plugs and wires he cleaned them and the car ran well for a half hour and then started backfiring from stand still more than ever
Expert:  john -aka eauto replied 1 year ago.

why didn't he replace the wires?

Customer: replied 1 year ago.
I don't know but o am going to ask that they do tomorrow
Expert:  john -aka eauto replied 1 year ago.

simple math ..it ran worse after wire replacement, subaru dealer cleaned them ran better then got bad again...sounds like its the wires,,,nobody cleans wires...

Expert:  john -aka eauto replied 1 year ago.

I hope you get this resolved..

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