What is your question?
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What is your question?
Why is my Nissan Quest Engine losing power and backfiring, especially up hills and when torque is needed.
What makes this problem better or worse?
When giving gas to speed up or go up an incline
How long has your 2004 Nissan Quest had this problem?
Just bought second hand
1 Reply
Hello, Backfiring and losing power at high engine demand may be a result of worn valve seats or burnt valves. There may also be an ignition issue causing a misfire at peak demand, and this would cause the unused fuel to ignite in the exhaust system due to extreme heat. I would recommend consulting a professional for hands-on diagnostics, and a leak-down test may be performed.