February 25, 201115 yr I've put about 400 miles on my car (98 Forester) after changing the Timing Belt. Every mark was right on before I buttoned it up and when I first started it, it fired off immediately. Now, however I am noticing that cold starts take a few more cranks to fire off and there is some slight hesitation on acceleration until it warms up. Warm starts are fine. Could the ECU have masked a problem with the timing until the engine adapted to the off-time condition, or would any mistakes have shown up immediately? My original problem was a tight exhaust valve in #4 cylinder. That took 122K miles to show up. I wonder if the same problem has come up on another cylinder at 122.4K.
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