purge valve?

[dsulu]

Hi folks,

I have a 98 2.5 litre/5-speed boxster w/ 110K on the odometer.

I have been trying to troubleshoot engine stalling problem for sometimes.

I have read several topics pertaining to problems with engine stalling and I have changed/cleaned the following in the past 2 years

Changed

-AOS, J-tube, fuel pump, fuel filter and crankcase hose ( its' connector was damanged when I changed AOS), oil dipstick tube.

Cleaned

-throttle body, idle control valve, intake manifolds.

I started to wonder if the problem I am experiencing is associated with fuel-line related parts, not vacuum leak.

No check engine light.

Idles fine ( in most cases)

engine would stall while driving, ( especially engine running in low rpm, above 2500rpm the engine would keep running)

Does a defective purge valve (the one by throttle body) cause this type of problem without triggering CEL?

Any help is appreciated.

[White987S]

Do you have a code reader. Any codes? How's your MAF sensor.

[dsulu]

Thank you for the quick reply.

I don't have a code reader and that is the reason why I have been reading and changing parts that I think are culprits to the problem.

( I know, it gets to be expensive; although I didn't mind initially and I am now seriously looking at durametric $278 enthusiast version)

I cleaned the MAF using MAF cleaner and it has never been replaced.

[JFP in PA]

Without a proper scan using a Porsche specific system like the Durametric, anything would be a guess.

[dsulu]

Sorry about the late reply,

I Finally got the Durametric system, hooked it up to the diagnostic port before and after the problem that I have been experiencing, NO error code.

I also un-connected the MAF and test drove the car before I got my Durametric, still the same problem.

Next thing to check and/or replace, crankcase position sensor. ( any thoughts?)

[JFP in PA]

Sorry about the late reply,

I Finally got the Durametric system, hooked it up to the diagnostic port before and after the problem that I have been experiencing, NO error code.

I also un-connected the MAF and test drove the car before I got my Durametric, still the same problem.

Next thing to check and/or replace, crankcase position sensor. ( any thoughts?)

The CPS will shut off the fuel pump if it goes bad. You might want to set up the Durametric to log data and try running the car until it acts up and see what the system catches.

[dsulu]

Thank you for the quick reply and suggestion.

This Durametric is pretty cool, I will be exploring many of its' features.

I will also try to see if there is any cam-position deviation to see if I have some of IMS failure symptoms.

Once agan, thank you!