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About two years ago I swapped out the 2.2L engine in my '91 Subaru Legacy for a 2001 2.5L. There were several connectors on the wire harness that weren't compatible and so compromises were made to get it to run. Unfortunately it soon started to hesitate under rapid acceleration and backfire when downshifting, not much at first, but it progressively got worse. I checked everything I could think of, replaced some parts that were too old anyway, and finally chalked it up to the difference between the two engines causing timing issues.
I was thinking about spending too much time and money to upgrade the harness, fuel injectors, etc, when my gas cap broke in the recent cold weather. When I drove the car to the auto parts store to pick up a new one there was a big surprise: the hesitation and backfiring were gone! Not only that, but when I put on a new cap, I noticed when the car was turned off a loud gurgling coming from the gas tank.
My working theory is the gas tank has become completely sealed so the fuel pump has to work harder and harder to get gas the longer I drive. When the car stops the air is sucked back into the tank somehow, causing the gurgling sound.
Fuel starvation could explain the hesitation issue, but what about the backfiring? I thought that was caused by excess fuel, not a lack of it. And besides, the injectors are supposed to regulate fuel and throw an engine code if something goes wrong.
In any case I'm going to check the tank breather hose for obstruction.
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"Build a man a fire and he'll stay warm for a day. Set a man on fire and he'll stay warm the rest of his life."
'93 Subaru Legacy DIRTBOMB
'98 BMW M3
2013 Rallyx Co-VP
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