2003 Forester 2.5X 5MT & 2008 Impreza WRX 5MT & 2009 Impreza 2.5i 5MT
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280 Posts
I have a 2003 Forester 2.5X with 5-speed manual. It has 142,000 miles on it. I just bought it recently and I have been driving it daily. So as the title says the throttle response is sluggish.
I have cleaned the throttle body and IAC valve with CRC throttle body cleaner. that seemed to help. I then did the Subaru idle fix / idle relearn. this seems to have really helped with the stuttering I was getting when accelerating in first gear from a dead stop.
My next step is to replace the spark plug wires and spark plugs. Here's where I'm confused and need recommendations from you experts. I plan on installing NGK iridium spark plugs, but I'm confused on which part number for the plugs. Napa Auto shows the part number as NGK 3764 , but Amazon shows the part number as NGK 5464. I realize these are two different plugs and I don't want to damage my engine by installing the wrong plugs, yet I want the best possible performance I can get from my engine. In short what iridium spark plugs are you guys installing on your 2003 foresters with the 2.5 sohc engine??
I have cleaned the throttle body and IAC valve with CRC throttle body cleaner. that seemed to help. I then did the Subaru idle fix / idle relearn. this seems to have really helped with the stuttering I was getting when accelerating in first gear from a dead stop.
My next step is to replace the spark plug wires and spark plugs. Here's where I'm confused and need recommendations from you experts. I plan on installing NGK iridium spark plugs, but I'm confused on which part number for the plugs. Napa Auto shows the part number as NGK 3764 , but Amazon shows the part number as NGK 5464. I realize these are two different plugs and I don't want to damage my engine by installing the wrong plugs, yet I want the best possible performance I can get from my engine. In short what iridium spark plugs are you guys installing on your 2003 foresters with the 2.5 sohc engine??