Schnell Gelb

Very useful posts Mike, Thank you.
I found the seal -it is a VW/Audi part(pity the engine isn't !)
Here is the link for that part number -seal:
http://www.fcpeuro.com/products/vw-a...eal-1j0919133a
This link gives a comparison of the VDO price vs the Porsche OEM:
http://www.ecstuning.com/Porsche-200...h/99662010200/

GVA-SFO

Well, new pump installed, bill paid, and then, back home !

..And today : Same problem again !!!!!
I tend to think that the source of the problem is not the fuel pump, ..but the "immobilizer" !

txhokie4life

I would be surprised if the Imob was intermittent -- but who knows.

however check the ground connection and the connector for corrosion, you can
also open up the box and check the condition of the board.

the immob is under the drivers seat. Sadly it's the low point in the pan and so
any water intrusion will collect there :-(

If it is this -- check the boards and they will explain what has to happen next (and you can then thank/swear at Porsche)

Mike

txhokie4life

Re-read your original post -- I would try R&Ring the Crank Position Sensor first.

Mike

Macster

In an earlier post you wrote "Diag is now clear : Dead Fuel pump.".

How was the diagnosis of the fuel pump made?

When what proved to be a failed fuel pump in my Boxster occurred I checked the fuse and the relay and when these were ok I flat bedded the car to the local dealer. There the tech connected up shop 12V power to the fuel pump and confirmed it was not running. This was the confirming diagnosis.

I'm with Mike on his opinion the immobilizer is not at fault. If the immobilizer doesn't work right the engine does not crank at all.

You can "test" this if you want -- I would recommend you don't to avoid any extra complications at this time -- by splitting the key module head in two and *carefully* removing the RFID pill in the head. Take the key to the car and try to start the engine. While the key works in the lock and things look normal the engine just refuses to crank.

Furthermore, as Mike touched upon (and I mentioned in my first post) with the fuel pump eliminated a more likely explanation for the behavior is the crankshaft position sensor is at fault. I'm not a Durametric expert but it may be possible to view the crankshaft position sensor voltage signal with this tool.

GVA-SFO

@Macster : Thanks a lot for your messages.
Thanks also a lot to Txhokie4life.

About :
" In an earlier post you wrote "Diag is now clear : Dead Fuel pump."

This was the "diagnostic" given to me by the service person at the Porsche dealer.
So, this was not a "durametric diag" !

I conform that the problem is the same as earlier, i.e.: the one that made me calling AAA and get the car towed to the dealer.
Fuel pump changed, then, back home, all good, parking the car at the garage at home. Then two days later, trying to start it up : same ...problem !

I just connected my Durametric on it, and went to check of any error, but nothing.
The only thing that I do not like is under "Engine Module ME7.2", under "Ready status", I have in one of the lines : "Immobilizer : Active" !!!
But, I re-confirm : the starter crank the engine, I can see the RPM going up a bit while doing that (..so, IMO, the crankshaft position sensor seems to do his work !) but, no fire at all !

Very strange, ..and quite annoying !
I think, next week is going to be flatbed call #2 and back to dealer !

Macster

I do not know what the "Immobilizer: Active" means.

I do not think the no start behavior is immobilizer related but of course I can't say with 100% confidence the immobilizer doesn't play a role, maybe a major role in this.

If the immobilizer is responsible then the odds are it is beyond the home mechanic to confirm this and to know what to do about it.

Assuming the engine would crank with the immobilizer/security module being the problem -- which goes against my experience but assuming anyway -- if the immobilizer or security system wasn't getting the RFID there would be an error code that could be obtained from the security module.

That you see RPMs is not conclusive the crankshaft position sensor is fully functional. What you would want to see would be some evidence the injectors were being triggered along with the coils.

txhokie4life

You can check fuel flow at the engine -- I think there is a hose
you can pull and put into a bottle just before the fuel rail.

Because of the coil paks, it is harder to check for spark
but I guess you could pull one and check for spark.

We've had three no starts resolved via the CPS -- not that hard to do and
not that expensive. They tend to fail with a hot start issue, so they can appear to be intermittent. However, we had 1 that failed with no hot start symptoms at all.

Mike

GVA-SFO

Well, thanks for all your advises. I tried few things, but, nothing up.
Tomorrow, I plan for flatbed call #2, back to my favorite dealer, and will see what's up.
I will keep you up to date. May be a got a new fuel pump, ..but the OEM one ..was still good !

txhokie4life

Not dissing your dealer -- but if you are going to track your 15yr old Boxster -- I'd buddy up with an local indy. They'll probably be a bit cheaper.

I'd ask around your track buddies and/or PCA/POC folks.

cheers,

mike

Macster

You might to think about how to leverage the fact the dealer tech diagnosed the fuel pump as begin the problem and yet it turned out to not be the problem.

While I doubt you will get the cost of the fuel pump R&R refunded to you you might be able to get a break on some diagnostic time.

Ask what "Immobilizer: Active" means. 'course, the tech will probably not be familiar with Durametric and in no mood to expend any time and energy going over this with you, but see what you can learn.

GVA-SFO

Thanks Macster.
Yes, the Fuel Pump was most probably a "surgery mistake" !
Will see what it is, I hope soon.

Flatbed call #2 :

GVA-SFO

Diagnostic from the Dealer :
Dead fuel pump ..again !
Is it a very-very unlucky "double event" ?
or,
Is something somewhere that is acting as a serial killer of fuel pump ????

Macster

Well, it is plausible. Infant death is a very real possibility for any manufactured item and fuel pumps fall into that category, obviously.

(Could be worse: I have read about a few unfortunate owners who received a replacement engine only to have the replacement engine fail prematurely. And in one notable case, the unfortunate owner had the 2nd replacement engine fail prematurely.)

If there is a serial fuel pump killer condition with your car you should know it pretty darn quick. Then you can ask the dealer/service department what it intends to do about this repeating fuel pump failure.

My WAG is this double failure event is just a coincidence.

Schnell Gelb

If there is a corroded ground anywhere in the system ,you'll get endless (fuel pump) failures/gremlins ?
The 'under the seat' suggestion is basic,cheap, easy. Do that first?
While you are in there I suggest you drill a drain hole in the lowest spots .This is a mod that has been mentioned in old posts here. If the floor has filled with water a few times ,you could have lots of electronic gremlins.
I started a thread on sealing+draining the electronics on the floor about 3? months ago. It got hijacked by a vendor who had a product to sell so I abandoned it. There are lots of inexpensive and effective ways to seal the electronics on the floor from water ingress. If there is some corrosion there, the damp weather of Fall will 'reactivate' the corrosion and cause more problems?