('01-'02) Hard start, High fuel consumption, No CEL - Subaru Forester Owners Forum
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post #1 of 2 (permalink) Old 08-29-2018, 03:09 PM Thread Starter
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Join Date: Aug 2018
Location: San Jose, CA
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Car Year: 2002
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Hard start, High fuel consumption, No CEL

Hello and thanks for reading! As the title states I've been experiencing difficulty starting on occasion, hot or cold. The starter (and engine, I think?) turn(s) over but no start. When I try again it will fire up. Fuel economy seems to be suffering.

I should mention that I replaced the battery about a year ago with Walmart's cheapest option at $50 with only a one year warranty. At the time I figured for the price who cares if it only lasts a year, as the 2 year warranty next up was $100. A bad battery would not explain the fuel consumption though.

The hard start does not seem to happen if I leave the key at half way for a moment before turning all the way (fuel pump, poor battery?).

As a preliminary try I cleaned up the battery terminals and air filter, but the problem persists.

After some research my hunches are:

Fuel filter (I've never changed and I've owned the car since 100k, now at 160k).

Front O2 sensor (recently replaced faulty rear O2 so it could follow that the front is on its way out too).

Faulty fuel pump (though I do not seem to have a loss of power or rough idle).

Leaky fuel injectors.

I do not have a fuel pressure gauge, but I may have to pick one up.

If anyone could chime in with their 2 cents I'd greatly appreciate it!

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post #2 of 2 (permalink) Old 08-31-2018, 03:26 AM
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Join Date: Aug 2018
Location: Tallahassee, FL
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Car Year: 2018
Car Model: Forester Premium
Transmission: CVT
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This could be anything from a leaky injector to a failed or dirty MAF sensor. You could try pulling the MAF sensor and cleaning it. There are a list of other things it could be but perhaps starting with the MAF might help. Good luck.

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2018 Forester 2.5i Premium
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