I have a pontiac grand am se quad 4 I have been trying to find out why I am loosing over 100 miles a tank. I replaced a faulty fuel pressure regulator, tested the coils,put in new plugs. Tried using fuel injector cleaner and also checked the air filter and a compression test. every thing looked good with no results. I gave it to a shop and they couldn't find it. All sensors are working fine with no trouble codes or check engine lights. I'm all out of ideas.
Apr 7, 2010 at 2:45 PM
