high idle when cold start

[ramonesfreak]

my car runs perfectly. however, the first start of the day, the idle jumps up to 2K. After about a mile, it drops below 1K and stays there until the next day's start.

Next week, im having the mixture checked...just because the car is new to me and im curious.

i dont want the mechanic going crazy trying to solve the high idle problem because it doesnt really bother me. but, im wondering if i should have him check it out, if the mixture could be causing it etc...

does anyone else have this situation? as I said, the car after its warm is perfect so far....

[tcesar888]

This is normal. The various warm up systems/regulators do this automatically... Unless anyone chimes in to correct me; this is perfectly normal. My '79 does EXACTLY the same thing; and I live in Hawaii, where its always warm.

After the car warms up; you should be idling around ~950. If not, you can easily adjust that yourself...

Hope this helps!

Tom

[ramonesfreak]

ok..ill take your word for it since the process seems to consistent every time it..it does seem normal.

another question then, should i even bother having the mixture checked if the car is otherwise running apparently perfect? im having the belt changed too so i was just gonna have him check it while i was there and i assumed it was not expensive to have it checked....maybe it is expensive?

[equality72521]

Yeah, it's normal. If it isn't too expensive have the mixture checked. If it's running great you probably don't have any issues, it's really your call. Piece of mind maybe.

[ramonesfreak]

thanks guys
-like the marley quote!

[tcesar888]

Hi Scott,

If your technician has a computer & exhaust sensor, they should be able to do it quite simply and quickly. Straight forward mixture adjustments are done by turning the adjustment (small hex bolt) located above the air-box, just left of the fuel distributor - little tight to get at (you need a small "T" hex tool).

It shouldn't be expensive, maybe even free if he's all setup and has the time...

Performing full-boar tests and a mixture normalization "probably" (haven't had it done myself) entails multiple "circuits" and adjustments (IE: regulators, vacuum, among others...). I figure the basic test above should give you a good idea of where you stand.

Make certain to ask lots of questions, and run it by the Pelican forum for validation. I can't count how much time and money this forum has saved me... I learn something every time to go to this site...

Hope this helps.

Tom

[Bobboloo]

As others have said your car is operating as it was designed. Just get in it, drive and enjoy yourself. No need to fix what isn't broken.

[tcesar888]

Hi Scott,

I have to agree with Bobboloo to some degree. Its very easy to get OCD and anal over these cars... Me being one of them...fixing, if not breaking things that simply don't need to be worried about or touched. But that's just me; I am "Uber Improver Man"! It's a costly life, but someone has to do it...

You'll find your way, and your comfort zone. Its all in the fun and spirit of owning a Porsche; especially an SC... Enjoy!

Mahalo!

Tom