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Showing results for tags 'fuel trim'.
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OK a little late on maintenance at 135K miles, I decided to check out the fuel filter. Turns out the only fuel filter is a "sock" inside the gas tank and according to SOA tech "we never change them". Anyone change/examine yours? While on the subject, this week I will be visiting a mechanic to track down the cause of an elusive P0420 that a data log interpretation is pointing to either vacuum leak or poor fuel delivery (perhaps both if I'm really unlucky?). Mechanic plans on "smoking" the car in search of any vacuum leak and then checking fuel pressure. Would you check pressure first or it doesn't matter? Few questions: 1. Can a fuel pump be failing (weak) without obvious symptoms over a period of 2 years and 30K miles? Since the dealer doesn't stock the pump, is this easily replaced? Any directions appreciated. 2. Where is the fuel pressure regulator? Same question about failing/weak fuel pressure regulator symptoms?? 3. Can the "sock" filter become coated and therefore ineffective? Doesn't look like it is replaceable.