Vanos13

Recently, I have had occasional difficulty starting the car when hot after refueling. It doesn't happen every time but when it does the car will crank at a normal speed but not catch for ~5-10 seconds. It seems to help to feather the gas. After getting it started the car runs normally. It also recently threw a P0446 check engine light. I don't have a Durametic so can't run a more detailed diagnostic. There are no issues filling the car with fuel.

Discussions over in the 996 section suggest these symptoms are often a sign that the EVAP system purge value aka "regeneration value" (http://www.pelicanparts.com/catalog/...pg3.htm#item11) needs to be replaced.

Do people agree with this diagnosis? Does anyone know the part number for the culprit on the GT3? Is it easily accessible? I haven't been able to locate it in the parts catalog or service manual.

Thanks immensely for the help.

Vanos13

I think I found the part number - 996 110 129 90. I looks to be in the upper left corner of the engine bay, near the intake manifold. I'm not sure how accessible it is though. Not a lot of space to work up there. Anyone have any thoughts?

george996

does it only happen after refueling? what about a hot start?

Vanos13

Thanks for posting that document. Yes, it has only happened after refueling, and not after every refueling. Haven't had any problems with hot starts.

george996

check out the attachment i posted. the purge valve (regeneration valve, same thing) could be the problem. if you had a general hot start problem i was thinking that you are losing fuel pressure when you stop running.

if the purge valve is stuck open i would think that you would notice this in the fuel trim. a generic scanner would probably pick this up but it will not show you fuel trim for rkat (idle range), i think it will only show an overall trim value. durametric will show you the fuel trim for idle range (rkat) and upper ranges as well. a leaking purge valve would be most noticeable at idle.

Vanos13

An update in case anyone runs into a similar problem - I fixed the problem by replaced the regeneration valve (996 110 129 90). It's an easy DIY.