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Old 05-14-2014, 08:39 AM   #1
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I accept my faith, but still what you think it could be?

Hello All

Yea I accept my faith, I' m gona lost $. I was selling my 2000 Boxster S to put a cash down on my new 981 coming in the end of June. But a problem appear. I dont think anybody will cry for me, I'm still gonna have a 981. There is much worst in the world right now. But it now have a dad idle, running poorly and not steady. It's still driveable, but cannot be push it or it will cut, go, cut go. If I drive normaly, its ok, only idle strange, but dont push it.

I pass all day yesterday at my trusted mechanic (Autobahn8). He does crazy ammount of Porsche, from 356 to brand new 991 and other exotic like ferrari and Lamborghini. All to say he know is stuff.

After looking at everything around the engine, all vacuum possible, exhaust and cat, all electronic and testing with other part he keep on hand (trottle, maf etc etc). Looking at gas pressure, coil, etc etc. Nothing, he could not find where its comming from. No code.

Now he think something inside is wrong. He talk maybe about exhaust cam timing being off due to broken chain guide our worn guide or vario cam sliding. It can be a lot.

What you guy think could cause bad idle, bad response, but still drivable and not trowing code? It is just for fun, just to talk about engine trouble and educate each other

I wont drop the engine, I wont put 3000$ just to find out what and if it can be easily repair or not to be able to sell at the same price I was asking. Someone else will take the guest at half price I was asking.

Alright, go , what can be at fault?

Later Chris

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Old 05-14-2014, 10:16 AM   #2
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I think that any credentialed Porsche mechanic should have the software (Durametric is minimum) to tell you if you have any of the major mechanical failures you're describing.

He should be checking Cam deviation, Cam timing, fuel trim etc...

Does it run fine until it is under load?

There are so many things that can cause the vague condition that you've described. Things like a soft fuel pump (won't supply adequate fuel under load), bad ignition wires, bad coils and more. If the car is not throwing a CEL, I doubt you have a serious timing issue.
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Old 05-14-2014, 10:26 AM   #3
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that can't be good :/

RE the cause... I'd say it is owner's discouragement. Take a break, then put your stuff (+mind) back together and finish what you've started. I've seen you working on your engine and all for the last 6 months. I have enjoyed many of your posts in fact.

Take an appointment with your local Porsche service manager and get him to diagnose the car for you. They have a pretty solid diagnostic protocol @Porsche and will find your problem within 5 (five) tests. Most of them Piwi initiated

You'll eliminate stress, money on the long run, and feel safer

ps. bring some home cooked cake for your service manager... it is an old Porsche after all
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Old 05-14-2014, 10:31 AM   #4
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good advice

What Nine8Six said
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Old 05-14-2014, 10:58 AM   #5
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I must admit, there is a little bit of discouragement. but still, we have done so much on the car and so far nothing. It need more important investigation, which mean to much investment for what its worth. If it was my car to keep, I would prolonged the trouble shooting and probably drop down the engine to find out what is going on, but the 981 is coming, so its not worth paying more.

For more information, my mecanic does have put the car on a porsche specific tester. I dont know which one exactly, but its been test. And of course we have change a lots of parts to be safe. We know they are ok from test but just in case, so fuel pump, coil, spark and so much more have been change. All the usual we always ear here to do have been done long ago.

Yes it run ok when not load, idle rought, but run ok. Been able to come back home (300km trip) without too much trouble. Bouncy/rought idle at some stop light, sometime had to hold gas so it wont die, but it run.

I know from these informations its hard to tell, but this tread is more to talk about internal problem possibility to help more people diagnose trouble.

Later all
Chris
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Old 05-14-2014, 11:09 AM   #6
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Another Head

I used to do component level PC board repair on UHF and VHF equipment, may times a tech could look at the same problem over and over and miss something obvious. In our shop it was very common for one tech to go across the dept and ask another to look at something that had him stumped ....it could be as simple as this...time for another set of eyes IMHO

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Old 05-14-2014, 11:21 AM   #7
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Have you tried running it with the MAF sensor disconnected?
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Old 05-14-2014, 11:34 AM   #8
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+1 Take it to the dealer for diagnosis.

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