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please help if you can idle problem boxster reving slightley between 600and 800 rpm

A

Anders

New member
hello everyone my boxster is reving now and again when im parked up or just sitting at the side of the road .
It dosn't do it all the time , just sometimes.
i could drive it for 200 miles and it is fine then the next day i could drive it for a distance of 10 miles and when i pull up it rev's between 800 and drops to 600 rpm's
then back up to 800 and so on.
please forgive my spelling and gramer it was never my stong point.
if you have had a problem like this please advise me of what it could be.
thank you all for you help regards Anders
ps the boxster is a v reg 986 boxster 52.000 full service history
thank again for your help
 
just tryed it there and its ideling at 800 and sounds great but when i parked it about 1 hour ago it was reving up and down a bit below 800 rpm's and had a bit of a shuder
 
Some questions for you:

How many miles have you driven since your last service?
Any check engine lights recently?
Has the battery been replaced whilst you have owned the car and if so when?
Has the battery been disconnected recently?
Any other recent work on the engine MAF or throttle body clean spark plug change?

... one last thing for now whereabouts are you located?


 
Most likely a dirty MAF - mine has the issue now and then and has done for the last 60k miles - I have the torx driver just need the motivation!
 
Have seen this before on a freinds 3.4 996. Turned out that the oil filler cap wasn't on securely causing an air leak into the crank case, which also flagged up a sensor fault on diagnostics. Worth checking, you never know.
 
thanks for speedy reply's i had the boxster serviced about 1000 mile's ago but the problem was there before i had the service done yes i had an engine managment light come on and the kind AA man reset it and hasn't come on again . Im in Glasgow to answer the other question . It only happens now and again but is still worrying as i dont want it to start other probems any help with thiis post is kindly received regards anders
 
as for the battery iv only had the boxster for 1 month so i dont no when the battery was changed and again i dont no if it was disconected when serviced should'nt think it was .
MAF can i clean this myself anyone give me some hits or tips as how to clean
 
Anders
Where did you get it serviced in Glasgow as there a few independents that would look at it for you .
Brian
 
ORIGINAL: Anders

as for the battery iv only had the boxster for 1 month so i dont no when the battery was changed and again i dont no if it was disconected when serviced should'nt think it was .
MAF can i clean this myself anyone give me some hits or tips as how to clean
Click to expand...

You may find this link useful albeit very detailed .... For CRC MAF Cleaning fluid substitute isopropyl alcohol, I will stress though Don't try to touch the sensing surfaces with anything!!! If you do not possess the Security T-20 torx you should be able to get this from Halfords.

http://mike.focke.googlepages.com/checkenginelightcausedbymassairflowsensor

An OBD reader would also help in confirming your problem.
 
As others have said it could be the MAF but it could also be something in line with it that affects what the MAF is picking up. I had the same symptom so cleaned the MAF and it didn't resolve it. Put a new MAF in and it still didn't resolve it. It was finally found to be caused by a leaking air oil separator. Once that was changed all was back to normal.
 
Hi all well i got the roof in the service position and took out the storage box
and then the carpet and the engine cover and there it was my first look at my boxsters engine
was very very of breaking things but was glad i did.
now i can start to look at all the different components that make up the air flow to my engine
so i thought id stop were i was and fix everything back together and wait for the correct gasket
and maf cleaner and start again .
my problem is this after going threw my service records
i have just learnd that my boxsters mas airflow sensor was replaced about 1 year ago or 8000 miles ago
and now I'm thinking that the problem was there before the previous owner changed the maf
and the problem has returned.
when i get the gasket and cleaner i will clean it and sarounding parts to see if it makes any difference.
I'm not holding my breath but at least if i clean all the parts then at least i can rule out this
from the many causes. i also read somewhere that it might be a fault with corrupt software data
and might never get fixed so we all might have to live with this fault.
i love my boxster and its just a shame that Porsche cant find whats causing the problem to all our cars
shame on you porsche
 


this is a part of a post that i found somewhere on the net.
please bear with me on this Idle Problem Update:
After 4 trips to 2 different dealers, the problem is still unresolved. Due to the extremely poor treatment I received at Tom Wood Porsche in Indianapolis, I decided to work exclusively with Beechmont Porsche in Cincinnati, OH.In June of 2000, I learned of a "DME upgrade" for the engine control software/calibration that would solve the problem. After 2 trips to Tom Wood, they finally tried to perform the update, realized that they didn't know how to do a full DME recalibration, and called the regional service representative.

They were told by the regional service representative that it wasn't new software, but rather a reinstallation of the same old software. It was previously believed that the initial software installation at the factory was incomplete and that reprogramming would correct the problem. This is no longer believed to be the case. According the the regional service rep, the "DME upgrade" didn't solve the problem on the last 3 cars with which he had been involved. I'm still waiting to have this problem resolved.

The vehicle was since taken to Beechmont Porsche in Cincinnati, OH and extensive testing was performed and a factory representative was involved. The conclusion was that a new calibration needed to be developed for the engine computer. I have since been informed that a new calibration will not be made available and that there is no way to resolve this problem
now my car has had a brand new DME unit and new maf sensor and the idle problem still exists now mines not as bad as some folks cars but after cleaning what else can i do
oil separators and check for leaks if all these expert cant find whats wrong,
then what chance has a wee guy from Glasgow of fixing this idle problem.
sorry the grammar isn't great so apologies there.
I hope this will help anyone with this fault
 
It's interesting that you've found that the MAF has been changed. I would check if you have the right one if I were you because the early 2.7s had a 996 part number MAF and the later ones have a 986 part number. Which one you need will be dependent on your chassis number. HOWEVER a 2.7 initially delivered with a 996 MAF can have a 986 MAF fitted IF the DME is reprogrammed by Porsche (there is an official Porsche tech document on this).

The change of MAFs happened during the 2000 model year. Details of the MAF numbers are:

996 606 124 00 - is for the early 2.7/3.2 cars with chassis numbers up to WPOZZZ98YS602145 (or 42000 which I think are 3.2 numbers).

986 606 125 00 - the latest version. (there is an even slightly later version with 01 at the end but it makes no difference).

If the problem is with your MAF, I see there are two potential scenarios:

1. Your car needs the 996 version and someone has put the later 986 version in but not had the DME re-programmed.
2. Your car had the DME reprogrammed early on but someone has put the old 996 version in as a replacement (this won't work properly with a re-programmed DME).

How do I know all this? Well...I bought a new MAF from my local Porsche centre (£380) who insisted my car should have the 996 part even though the one I took out had 986 on it. The car performed well under par for the following months and I finally got fed up and borrowed a 986 part and hey presto the car got its performance back! It was a very expensive lesson because I couldn't get my money back because the MAF I bought was not faulty (it's just that they supplied the wrong one!).


 
ORIGINAL: Steve Brookes

It's interesting that you've found that the MAF has been changed. I would check if you have the right one if I were you because the early 2.7s had a 996 part number MAF and the later ones have a 986 part number. Which one you need will be dependent on your chassis number. HOWEVER a 2.7 initially delivered with a 996 MAF can have a 986 MAF fitted IF the DME is reprogrammed by Porsche (there is an official Porsche tech document on this).

The change of MAFs happened during the 2000 model year. Details of the MAF numbers are:

996 606 124 00 - is for the early 2.7/3.2 cars with chassis numbers up to WPOZZZ98YS602145 (or 42000 which I think are 3.2 numbers).

986 606 125 00 - the latest version. (there is an even slightly later version with 01 at the end but it makes no difference).

If the problem is with your MAF, I see there are two potential scenarios:

1. Your car needs the 996 version and someone has put the later 986 version in but not had the DME re-programmed.
2. Your car had the DME reprogrammed early on but someone has put the old 996 version in as a replacement (this won't work properly with a re-programmed DME).

How do I know all this? Well...I bought a new MAF from my local Porsche centre (£380) who insisted my car should have the 996 part even though the one I took out had 986 on it. The car performed well under par for the following months and I finally got fed up and borrowed a 986 part and hey presto the car got its performance back! It was a very expensive lesson because I couldn't get my money back because the MAF I bought was not faulty (it's just that they supplied the wrong one!).
Click to expand...

Here is the USA version of the Tech Bulletin (the Europe one is similar but substitute EU coding in lieu of LEV for a UK Spec car. Hopefully readable:




23237BC68CD94438A435092ECF121CBD.jpg
 
ORIGINAL: Anders

its just a shame that Porsche cant find whats causing the problem to all our cars
shame on you porsche
Click to expand...

I'm not surprised at all. Don't assume because it is Porsche that their mechanics are any different or better than any mechanic that works at any other manufacturers dealership or any other garage. Your best bet is to take the car to a decent specialist to diagnose. They live off their reputation and don't have expensive warranties to hold their customers over a barrel with so generally know alot more about the problems and how to fix them than the average Porsche mechanic.

A mate of mine had similar issues (almost identical to your description) with his early Boxster and it was the MAF. Porsche quoted him a small fortune to replace, he did it himself in less than half an hour and bought the stock Bosch part (shared with alot of other cars) from a different non-Porsche vendor. Porsche never knew and he never had any issues with his warranty.
 
Hi all this is what i no was done on my boxster

15/12/2008 Jack up all four wheels to check for brake binding none found
Remove air flow sensor to check exact number
Plug computer to check for fault codes
Change mass air flow sensor

parts Jetronic YG Mass Air Flow recorded mileage was 44.134

cost £346 indy


27/03/2009 Carried out system test for report of vehicle not revving,
Check the throttle housing and all feeds.
Fault traced to the DME Control unit.
Supplied and fitted new unit and code to the vehicle and test

part no p996.618.605.00 012032/control unit recorded mileage 47876
price for dme control unit £814
total £1230 porsche centre Cardiff


Now you can see what has being done to my car can i rule out MAF and DME as likely problems
to cause idle problem that i have.
Thanks to all who have posted
l really want to fix this idle problem as i don't feel that I'm getting
Porsche's build quality and performance right yet
 
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