Originally Posted by zirrah

Before you discount the 997.1 I'd define which issues you are referring to? The only one I'm aware of is the IMS but that only affects 2005 model year 997's. It was fixed after that. And I did see your thread, blows...no pun intended.

Originally Posted by Charles Navarro

I'm currently doing research on the HPFP issue is more widespread than just Porsche engines. There is no test currently in the ASTM for gasoline lubricity. They are using a modified diesel lubricity test, but because of the volatility of gasoline, the testing isn't very accurate or representative of real world results. The papers I've read more or less state that manufacturers are using current production models as in field tests and adjust while a standard for lubricity is determined and as technology trickles down to help with lubricity related failures such as coatings offered by Oerlikon Balzers, which we use in the IMS Solution.

Long story short, part of this has to do with the poor lubricity in ethanol fuels. What you can do to help with this is to try to use non-ethanol fuels, where available. The next best thing would be to use Top Tier fuels and use regular ethanol fuel system treatments. Driven makes one called Injector Defender and for older cars with carbs, Carb Defender.

Although the elimination of sulfur from diesel fuels led to lubricity issues, the added biomass provided more than ample lubricity. Ethanol is highly corrosive and requires significant dosing of fuels with LE (lubricant enhancers), which lead to intake deposits.

The technology hasn't been perfected yet.

Originally Posted by rootwyrm

The HPFP (High Pressure Fuel Pump) is a guaranteed failure on the 997.2. It's just going to go. It's not a big deal. Porsche will generally goodwill, and if not, it's only $1k for the part. (Remember to depressurize before attempting install.) It's definitely not a big deal to have fail - more like losing a coil than losing a cylinder. Just swap in new part, ignore the codes the failure set, and you're good as new. Onyxia's HPFP was replaced before she was offered for sale. It's essentially a wear part issue, but one that wears prematurely.



The PDK is second only to the C4GTS center differential. One thing I will tell everyone about the C4GTS is that it is the greatest Porsche 997.2 you can buy in 6 speed form, period. Add some power and it will devour everything. It's that over the top. But if you break the front differential? It's over $10k to replace because it S uses the Turbo S part, not the C4S part, and is non-rebuildable. Same problem out back. Do not even ask about the center differential. If you have to ask what it costs to fix that? You can't afford it. The good thing is that it's very unlikely, even on high mileage examples. But if the center is going, you'll know. Immediately.
When you've been told "the price is 'call Stuttgart,' so only if you REALLY need it," you know things just went off the rails.

Originally Posted by Charles Navarro

I'm currently doing research on the HPFP issue is more widespread than just Porsche engines. There is no test currently in the ASTM for gasoline lubricity. They are using a modified diesel lubricity test, but because of the volatility of gasoline, the testing isn't very accurate or representative of real world results. The papers I've read more or less state that manufacturers are using current production models as in field tests and adjust while a standard for lubricity is determined and as technology trickles down to help with lubricity related failures such as coatings offered by Oerlikon Balzers, which we use in the IMS Solution.

Long story short, part of this has to do with the poor lubricity in ethanol fuels. What you can do to help with this is to try to use non-ethanol fuels, where available. The next best thing would be to use Top Tier fuels and use regular ethanol fuel system treatments. Driven makes one called Injector Defender and for older cars with carbs, Carb Defender.

Although the elimination of sulfur from diesel fuels led to lubricity issues, the added biomass provided more than ample lubricity. Ethanol is highly corrosive and requires significant dosing of fuels with LE (lubricant enhancers), which lead to intake deposits.

The technology hasn't been perfected yet.

Originally Posted by Petza914

Hey Charles, any experience with SeaFoam for fuel lubricity? In the older 928s with mechanical fuel injection, a number of guys swear by it for keeping the fuel distributor working properly.

Originally Posted by mjsporsche

Cars driven properly in cold temperature climates are not the problem. Cars driven improperly in cold temperature climates are the problem. There is a difference so lets not throw all of us cold climate people under the bus.

Originally Posted by sandwedge

That was not my intention and I apologize if that's how it came across. Just to point out that there's been a lot of opinions posted here linking cold climate cars to more bore scoring events than cars spending their life in the south. I guess the question is: how do you identify cars that have been driven properly in cold temperatures vs. those that have been driven improperly? All I can think is bore scoping prior to buying.

Originally Posted by Charles Navarro

That's part of our "toolbox" of products we use. Lubromoly's Jectron is good stuff too.

Originally Posted by Charles Navarro

That's part of our "toolbox" of products we use. Lubromoly's Jectron is good stuff too.

Originally Posted by mjsporsche

Apology not necessary. We are fellow enthusiasts.

There is no sure thing about buying any pre owned Porsche. Plenty of examples of PPIs that overlook obvious flaws. With that said, a PPI is mandatory and scoping for possible bore scoring is a good idea. The problem is that few can really properly interpret the results what they are seeing. I am also a believer in buying from the right seller is as important as buying the right car. A great dealer with a stellar reputation of standing behind their products is an example. A knowledgeable enthusiast private seller is another.

Some of the 997.1 haters are overstating issues, which is within their rights, and causing potential buyers to bypass a great vehicle. That is unfortunate as they are great cars. Just choose one carefully.

Originally Posted by mjsporsche

Apology not necessary. We are fellow enthusiasts.

There is no sure thing about buying any pre owned Porsche. Plenty of examples of PPIs that overlook obvious flaws. With that said, a PPI is mandatory and scoping for possible bore scoring is a good idea. The problem is that few can really properly interpret the results what they are seeing. I am also a believer in buying from the right seller is as important as buying the right car. A great dealer with a stellar reputation of standing behind their products is an example. A knowledgeable enthusiast private seller is another.

Some of the 997.1 haters are overstating issues, which is within their rights, and causing potential buyers to bypass a great vehicle. That is unfortunate as they are great cars. Just choose one carefully.

Originally Posted by Jaycote

Hey Charles, what else is in this toolbox of yours? I'm curious what types of everyday products that your team personally use or would recommend?

Originally Posted by mjsporsche

Cars driven properly in cold temperature climates are not the problem. Cars driven improperly in cold temperature climates are the problem. There is a difference so lets not throw all of us cold climate people under the bus.

Originally Posted by mjsporsche

Apology not necessary. We are fellow enthusiasts.

There is no sure thing about buying any pre owned Porsche. Plenty of examples of PPIs that overlook obvious flaws. With that said, a PPI is mandatory and scoping for possible bore scoring is a good idea. The problem is that few can really properly interpret the results what they are seeing. I am also a believer in buying from the right seller is as important as buying the right car. A great dealer with a stellar reputation of standing behind their products is an example. A knowledgeable enthusiast private seller is another.

Some of the 997.1 haters are overstating issues, which is within their rights, and causing potential buyers to bypass a great vehicle. That is unfortunate as they are great cars. Just choose one carefully.