Question about 2006 Subaru Impreza

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My new (to me) 06 subaru impreza 2.5 L eng. 5spd manual is having huge power issues. They weren't noticable at sea level, where I bought the car...but in the mountains (8000 feet) where I live, it is literally taking over 20 seconds to get to 60 mph and it is just sucking the gas down. had a diagnostic test run , it found nothing. the mechanic thinks the exhaust is plugged up? says he can't do the work

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  • dancingbears May 21, 2011

    I guess back to square one. I took the car to the subaru dealer, who said the catalytic converters are working properly. That night, I had my son slide under the car after I driven it for 5 hours, mostly up hill, to look for a red hot converter...he saw nothing.

    Subaru found a 'funky' sparkplug and wanted $530 to replace the sparkplugs and 'tubes'. Do you think that could be causing the sucky power issue? (which seems be getting worse). I could only go 55 up the hill last night, in third gear

  • dancingbears May 21, 2011

    Hi there thanks so much for your reply. Here is follow up info, I'm anxious to see what you think.

    I guess back to square one. I took the car to the subaru dealer, who said the catalytic converters are working properly. That night, I had my son slide under the car after I driven it for 5 hours, mostly up hill, to look for a red hot converter...he saw nothing.

    Subaru found a 'funky' sparkplug and wanted $530 to replace the sparkplugs and 'tubes'. Do you think that could be causing the sucky power issue? (which seems be getting worse). I could only go 55 up the hill last night, in third gear. Oh, and I didn't have them do the work. I'll try to do it with friends help

  • dancingbears May 21, 2011

    just to clarify, its 'tube seals' not the spark plug wires...I'm not sure what tube seals are or how hard they are to get to. looking on line, there appears to be a gasket where the sparkplug and the tube join, and that gasket may be leaking.

  • dancingbears May 28, 2011

    Hi again, I'm still struggling with the problem. Subaru said the cats were not plugged and thought it was a spark plug issue. I had my mechanic replace the sparkplugs, which he said looked fine and that the spark plug tubes were NOT LEAKING AT ALL (which subaru had wanted $500 to do!). And, it didn't help the performance of the car one bit!

    Oh, and the subaru dealer said my front cv boots were bad ($600 est) and my mechanic says they look just fine! that dealer is dishonest!!!

    My mechanic still feels its an exhaust issue, and had me take the car to the muffler guy to do a backflow test or something like that. He said he would make a small hole in each segment of the exhaust system and check the outflow any point if the pressure dropped from one piece to the next he would know where the blockage was. But, he also DIDN'T want to do the work..he felt it wasn't the problem (without even looking at it) and said to take the car to the foreign auto specialist (who has a bad reputation) in town. I asked him to do the test anyway. When I picked up the car later that day, he said he didn't do the test, that each component had its own 'shield' and he would have had to remove each one to do his testing, so he didn't do it.

    Oh, and I had my son look under the car at night after driving it for 5 hours straight, he didn't see anything glowing or red. Course I wonder if those 'shields' would block his view?

    So, I feel like I am back at square one. The performance is getting worse. Can barely crawl up the hill at 55 mph, at 4800 rpms. I haven't wanted to push it more than that. It hesitates upon taking off in first gear too.

    What else could it be? Could the computer, which is suppose to self adjust, not be adjusting the high altitude? I already disconnected the battery for an hour in hopes of getting the computer to reset itself. I'm doing it again, but this time for two days!

    Again, no codes are showing up on the diagnostic. Could an engine with 70K miles have compression problems? Any other thoughts?


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You may also have low fuel pressure or a restricted exhaust (IE- plugged catalytic converter). Obtain a fuel pressure gauge and check pressure, Autozone may have a fuel pressure gauge among their loaner tools (these tools they loan you for a refundable deposit).

If you have a restricted exhaust there are several ways to check. One is to drive the car at night and go up a long hill. Get out and look at the exhaust (especially at the beginning of the converter) to see if it is glowing from excess temperature. If you have a vacuum gauge there is also another test you can do- let me know if you happen to have one. Some people will drop the exhaust enough to create a leak before the converter (or remove the oxygen sensor-) and test drive. This works fine for troubleshooting purposes but creates the hazard of poisonous gas entering the cabin.If the CAT converter is plugged up, you have to buy a new one.
Hope this helps, James Booth. Please Rate THIS!! :)

Posted on May 18, 2011

  • James Booth
    James Booth May 21, 2011

    YES... that could be your problem. And i wouldn't pay ANYBODY 500 dollars to change your spark plugs and wires!!!!! They are ripping you off. But, that really could be your problem. Try it and you will probably have it fixed. :) Please rate this!!!


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