Hi

I have recently started experiencing an issue with the throttle response on my 06 Cayman S. It has no mods and around 82000km .

Anyway the problem is that occasionally when you push the accelerator pedal, nothing happens, and the engine seems to "bog", as if the pedal has been released.
If I take my foot off the pedal , and push it again, then it responds correctly.

Has anybody else experienced this ?

I have checked for fault codes, and there are none.

It seems to me to be a throttle position sensor issue. I would like to maybe as a first try, try to clean or service the TPS with some electrical cleaner. Has anybody tried or done this before ?
Should I remove the accelerator pedal / TPS or can I spray some cleaner in somewhere with out removing it.

Thanks

 

Is there a lot of dirt in the air where you live? I would check all plumbing along the air intake tract including the MAF for accumulated dirt. Clean it all up. Could be just a dirty MAF and/or dirty air cleaner. If that all looks good I might look at the fuel tract next starting with the fuel filter and injectors. I assume you use the correct petrol, keep fluids changed on time, etc.?

 

A new air filter (OEM Porsche) was fitted about 3000Km ago, so it should still be like new. It just occurred to me, after reading the reply, I did also recently have to replace the air/ oil separator. I'm thinking that it might have allowed some oil into the inlet fouling the MAF sensor maybe. I guess I will pull the engine cover and clean the intake and the MAF sensor.

Thanks for the input Steve997S

 

Failures of the e-Gas system and throttle body are pretty rare.

Since these are rather critical to the safe operation of the car if there is any real problem with either error codes would be present.

I would not attempt to disassemble and clean. There are no field serviceable parts in these devices.

The AOS can possibly -- it is rare -- foul the MAF. I had an AOS fail a few weeks back -- the 3rd one -- and the smoking was horrifically bad. But the tech reported the MAF was clean of any oiling.

Doesn't mean your car's MAF is so if you want to carefully remove it and clean it go ahead. Clean it over white paper towels to catch the cleaning fluid. If you see dirty fluid that's probably good news. If you do not well, at least you know.

Afterwards what you can try is an E-Gas calibration.

How to do this should be covered in your owners manual.

Generally they go something like this: With your foot off the gas pedal and keeping your foot of the pedal through the entire procedure, with the key off turn the key to on.

Leave the key on for 60 seconds. Then turn the key off for 10 seconds. Done.

You can run the seconds over if you want but not under.

The next time you start the engine the e-Gas has been calibrated.

If the behavior remains then it could be due to the e-Gas or throttle body acting up. To know for sure without any error codes to go on I think will require you get the car to a Posche tech who should know how to diagnose this.

And it doesn't have to be with the E-Gas or throttle body either. It would be due to premature failure of the replacement AOS. Or from the installation. Or a fuel filter. (Has the fuel filter every been replaced?) Or a number of other things.

 

Thanks for the reply Macster. but I've solved the problem , and it was nothing close to anything I had thought off or any of the replies had mentioned.

The problem was caused by, believe it or not, the brake pedal switch !!!



I found a thread on pistonheads.com which referred to the same symptoms and also referred to threads on Rennlist and Planet9 forums. ( http://www.pistonheads.com/gassing/topic.asp?t=1309650 )

Turns out there is some kind of interlock that cuts the throttle when you push the brake pedal, so when the switch is faulty, it randomly cuts the throttle intermittently.

New switch cost about R240 ($20) and took about 15 minutes to fit.
Here a link that shows how to change it ( http://www.pelicanparts.com/techarti...l_Switches.htm ).

I was very doubtful that it would solve the problem, but it was such a cheap and easy fix that I thought it wouldn't hurt to try. Been driving now for 2 days with no recurrence of the problem !


I can imagine that i could have spent many hours and much cash trying to find the cause had I not found this info !!!

 

That's good to know and good that you found that info before you dug into something else.

I had a brake light switch go bad in my 2002 Boxster some years back but all it did was cause the brake lights to flash then go dark and then as the switch got worse the brake lights didn't come on at all.