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Code po301 cylinder no 1 has 80 psi all the other have 180 psi

I have a saturn vue 2007 4 cylinder manual transmission. 75000 miles. Check engine lights has been on for a long time. Just did a diagnosis and they found a code PO301-missfire on cylinder 1. tech ran the engine on a scope, no electrical missfound. tech removed all spark plugs. tech ran a compression test. no1 cylinder has 80 psi, all the other cylinder have 180 psi. tech ran a leak down test to find 85% leakage past the exhaust valves. They recommend doing a valve job on the car $2000 and possibly $2500! Any raccomandation. I am lost! Thanks

Posted by on

1 Answer

How could you be lost

You explained it perfectly

The shop did all the correct diagnoses,
seldom see that at all,they did great job
of finding the issue

Posted on Dec 12, 2012

  • 4 more comments 
  • Fortunato Dec 12, 2012

    I am quite shock that I may end up spending that much money. A problem like this, if it is indeed so costy,is a sign of bad engine design. I am lost becouse i didn't expect such an issue with a car that is not that old.

  • Anonymous Dec 12, 2012

    Two things First you had a check light on & failed to check for codes & have any issues resolved in a week or so,that may be one reason your were your at The motors design could also be a contributing factor The years & mileage I will give you that one Not that old The cost !!! You just don't know the extent of time & what is involved to repair

  • Anonymous Dec 12, 2012

    I think you drove for months with a cylinder misfire in #1 & it was you who ruined the motor

  • Fortunato Dec 12, 2012

    Thank you for your time. Yes, I should have it checked sooner. But, the engine light was sometimes off. Anyway, do you think I should have it checked by someone else too, as a second opinion. Again Thanks for the time.

  • Fortunato Dec 12, 2012

    any thoughts on this? : http://www.ricksfreeautorepairadvice.com...

  • Anonymous Dec 12, 2012

    Your tech did the best job I've ever heard off & used the correct tools & methods for testing

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Replace spark plugs and wires. If thats not it, its your intake gasket. Mine did the same thing. I am working on putting my third intake gasket in my buick. 137740 miles

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SOURCE: no compression in one cylinder

Timing belt slipped around cam pulley. Take off your timing belt cover and check the position. This would explain misfiring and compression loss. Stretched belt or missing cogs in belt likely culprit.

Posted on Feb 04, 2009

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SOURCE: My son's 2000 Protege's check engine light came on

I recommend double checking the 02 sensor ( the one before the Cat) This item is the lead sensor when it comes to the ECU leaning or riching out the vehicle. The rest of the items they supplied you with can pretty easily be verified if you purchase the shop manual and follow its directions. NO SHORT CUTS, especially with the pressure regulator checks.

Posted on Apr 08, 2010

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