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Cold Weather Throttle Hesitation


Lyn

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I've noted that as the weather turns colder, my 2003 Boxster S has started to run pretty poorly when cold ( below 50 here in Phoenix is cold). Starts fine, idles fine, but does not want to take partial throttle input until the water temp is close to 180 degrees. The problem is more between the 1100 rpm to the 2500 rpm range (partial throtlle) because if you really jump on it, it will respond and run fine in the +3000 rpm range. This is a new issue this winter and i suspect a dirty MAF sensor to be a part of the problem. Then again there is a cold start circuit that I don't know anything about that could be the problem too. No CELs have shown up to make problem solving any easier and the Spark Plugs are fairly fresh.

Thx to any of the members that could offer some suggestions.

Lyn

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Loren,

Forgot to mention that I had cleaned the throttle body earlier this year. Regardless, I pulled the MAF sensor and it was 55,000 miles dirty. Cleaned it and the fifference is just short of remarkable. Runs smooth while cold and once warmed up, it seems to run much smoother throughout the rev range.

Thx for your advice though, as the throttle body could have gotten dirty again too and I will check it this weekend.

Regards,

Lyn

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