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2003 Subaru Forester X 4dr 2.5 Manual

2003 Subaru Forester
Trim Info:
All Wheel Drive, 4 Door, 4WD Sport Utility
21 mpg city / 27 mpg hwy
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February 6, 2012, 1:57 pm

Cassie S
 

Question: Having trouble diagnosing this problem...

For the last several weeks our car has been very week on take off and going up hills. Sometimes to the point of not moving forward at all. The engine also occasionally sputters and backfires. This usually happens when you hit the gas trying to get the thing to actually move. This all happens when starting from a stop. Once you build up a decent amount of speed, it seems to run just fine. We thought that it was the spark plugs so we changed those and the wires about 2 weeks ago and there's been no improvement. I checked the transmission fluid and the level is a bit high with some bubbles, and we plan on having it changed. I've heard many possible explanations from many different people. To name a few: clogged air filter, clogged fuel filter, bad timing. What is the most likely cause? As we can not afford to have all of those things fixed.


February 15, 2012, 11:33 am

Elizabeth K
Expert Mechanic

The problem you are describing could be caused by many things. A thorough tune-up will cover several of them, needs to be done anyway, and will get you farther along in the troubleshooting process. I recommend you start with that.

Here is an article on some causes of loss of power:
http://www.2carpros.com/articles/engine-has-low-power-output


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