Question about Saturn Cars & Trucks
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
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Posted on Jan 02, 2017
SOURCE: Buick Century 1997
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
Posted on Aug 17, 2008
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
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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