MPGs at age
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 6,165
Likes: 1,930
MPGs at age
2010 C4S PDK, still all original running gear ...
Leg one yesterday. It looks like the old girl still can push out some mpgs, even at speed.
But a CEL near mile 400 indicates I may be coming due for cats or O2 sensors (P0431). I'll try running some cleaner after I get home. Any recommendations?
Leg one yesterday. It looks like the old girl still can push out some mpgs, even at speed.
But a CEL near mile 400 indicates I may be coming due for cats or O2 sensors (P0431). I'll try running some cleaner after I get home. Any recommendations?
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 6,165
Likes: 1,930
Thanks. My son suggested that same brand as well. I was at his house in the midst of this trip. It will be delivered on Wednesday.
Meanwhile, I drove another 600+ miles after we cleared the CEL with no reoccurrence.
I've got another 6 or 7 hundred miles to drive this week so I'll put the CatClean in after that just for good measure.
Meanwhile, I drove another 600+ miles after we cleared the CEL with no reoccurrence.
I've got another 6 or 7 hundred miles to drive this week so I'll put the CatClean in after that just for good measure.
Rennlist Member
Joined: Aug 2005
Posts: 10,682
Likes: 546
From: I should be in TNT for Carnival!
Thanks. My son suggested that same brand as well. I was at his house in the midst of this trip. It will be delivered on Wednesday.
Meanwhile, I drove another 600+ miles after we cleared the CEL with no reoccurrence.
I've got another 6 or 7 hundred miles to drive this week so I'll put the CatClean in after that just for good measure.
Meanwhile, I drove another 600+ miles after we cleared the CEL with no reoccurrence.
I've got another 6 or 7 hundred miles to drive this week so I'll put the CatClean in after that just for good measure.
RL Community Team
Rennlist Member
Rennlist Member
Joined: Dec 2012
Posts: 7,603
Likes: 2,562
From: Atlanta
2009 C2S 202K miles
Interesting that such a neurotic group and we here have not addressed catalytic converter health.
What about the LiquiMoly product that you spray into the intake? This is not to be added to fuel. Any input?
https://www.liqui-moly.com/en/cataly...cription-title
Peace
Bruce in Philly (now Atlanta)
Interesting that such a neurotic group and we here have not addressed catalytic converter health.
What about the LiquiMoly product that you spray into the intake? This is not to be added to fuel. Any input?
https://www.liqui-moly.com/en/cataly...cription-title
Peace
Bruce in Philly (now Atlanta)
Last edited by Bruce In Philly; Aug 26, 2024 at 05:08 PM.
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 6,165
Likes: 1,930
The 5 North was so bumpy last night that the driver's side map light broke at all four solder joints. The LED bulb was rattling around in its chamber. Once I soldered it back together, all was OK.
Hmmm ... What else took a hit and is preparing to fail. Now I'm beginning to sound like Bruce!!!!
Note: On a drive across the Sierra a couple of weeks ago, my TPC DSC defaulted to full stiff, so the car had 600 miles of bumpy ride that day as well. I swapped it for the original controller, and all was fine. A couple of days later, I put the TPC unit back in, and all was good as well. The old adage ... There's no such thing as a good connection (some are better than others, but none are good). Then again, sometimes electronics just need to be powered down for a while.
The suspension was working fine last night. But the road was quite sub-par. These cars do put up with a lot of abuse!!!!
For the record ... We hit 160K miles in Laguna Beach. And then drove almost 500 miles further. We got home at 2:30 this morning.
Still no oil burned
Hmmm ... What else took a hit and is preparing to fail. Now I'm beginning to sound like Bruce!!!!
Note: On a drive across the Sierra a couple of weeks ago, my TPC DSC defaulted to full stiff, so the car had 600 miles of bumpy ride that day as well. I swapped it for the original controller, and all was fine. A couple of days later, I put the TPC unit back in, and all was good as well. The old adage ... There's no such thing as a good connection (some are better than others, but none are good). Then again, sometimes electronics just need to be powered down for a while.
The suspension was working fine last night. But the road was quite sub-par. These cars do put up with a lot of abuse!!!!
For the record ... We hit 160K miles in Laguna Beach. And then drove almost 500 miles further. We got home at 2:30 this morning.
Still no oil burned
Trending Topics
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
9 Features and Characteristics That Only Porsche People Understand
Verdad Gallardo
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way
Joe Kucinski
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)
Verdad Gallardo
Porsche 911 GT3 S/C vs 718 Spyder RS: 10 Categories, One Winner
Joe Kucinski
This Builder Is Turning Heads With Its Slantnose 911 Creation
Verdad Gallardo
Porsche 911 GT3 Artisan Edition Pays Homage to Japanese Culture
Verdad Gallardo
Porsche Reveals Coupe Variant of the Electric Cayenne With a Fresh Look
Verdad Gallardo
10 Porsche Colors That Have More Personality Than Most People
Verdad Gallardo
Guntherwerks' Final Speedster Creation Is the Ultimate Porsche Restomod
Verdad Gallardo
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 6,165
Likes: 1,930
Passed 161K miles yesterday.
No return of the CEL. So, to CatClean or not to CatClean? That is the question ...
At above 100 mph my mpgs drop to the low 20s as well, or so I've been told!!!!
No return of the CEL. So, to CatClean or not to CatClean? That is the question ...
At above 100 mph my mpgs drop to the low 20s as well, or so I've been told!!!!
Three Wheelin'
Joined: Aug 2007
Posts: 1,835
Likes: 1,236
From: Bend OR
According to my tech, there are other variables that go into the P0431 code, which is a generic Cat code. Do you have the stock exhaust or any aftermarket components? There are also pre and post-cat O2 sensors. If you have the right diagnostic tool, you can hone in on which bank is throwing the code and start troubleshooting by swapping the pre and post cat sensors and see what happens. Finally, it can be as simple as a loose O2 sensor or bad wiring. For realz. Good luck finding your problem and solutions.
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 6,165
Likes: 1,930
You've made good points. If the codes come back the Foxwell will come out.
I've got the Fister (gundo) mufflers. No other revisions. That's well behind the cats and the O2 sensors.
As my father in law was fond of saying ... There's no such thing as a good connection. Some are better than others, but none are good. Even actual failures beyond connections often can be traced back to connection problems. This mantra works beyond electrical to mechanical and hydraulic as well.
I had filled with a different brand of gas a hundred miles before the code popped up. That was the only variable. I've got 1500 miles since then with no indications of a problem. Fingers crossed.
I've got the Fister (gundo) mufflers. No other revisions. That's well behind the cats and the O2 sensors.
As my father in law was fond of saying ... There's no such thing as a good connection. Some are better than others, but none are good. Even actual failures beyond connections often can be traced back to connection problems. This mantra works beyond electrical to mechanical and hydraulic as well.
I had filled with a different brand of gas a hundred miles before the code popped up. That was the only variable. I've got 1500 miles since then with no indications of a problem. Fingers crossed.
Rennlist Member
Joined: Feb 2023
Posts: 21
Likes: 11
From: California SF Bay Area
Wayne,
We all knew it but now we declare You am DA MAN!
Others may focus on the CEL and discuss additives but WHOA!. Don't miss that pic of the PCM: Da Man left at 7a; 312 miles in 4hrs; AVERAGE speed 78mph! Toto, We're not in Kansas here. (And cash bail if we were.)
Congratulations on turning 160K. As you often say these 997's are just beasts if driven to purpose which is spirited and hard and well maintained.
You mention soldering the broken connection. Was that roadside... in the dark? We've seen your frunk equipment. You just happened to have everything needed for that aboard?
At 160K spirited miles, our colleague who drives a thousand miles for a very good sandwich will not catch you.
Keep up the pace and your good Werks.
Note for you folks out of CA, the road condition Wayne described. Trucks have so punished the right lane of I-5 between NorCal and SoCal that it's becoming one left lane of travel N or S for hours.
//frabjous
We all knew it but now we declare You am DA MAN!
Others may focus on the CEL and discuss additives but WHOA!. Don't miss that pic of the PCM: Da Man left at 7a; 312 miles in 4hrs; AVERAGE speed 78mph! Toto, We're not in Kansas here. (And cash bail if we were.)
Congratulations on turning 160K. As you often say these 997's are just beasts if driven to purpose which is spirited and hard and well maintained.
You mention soldering the broken connection. Was that roadside... in the dark? We've seen your frunk equipment. You just happened to have everything needed for that aboard?
At 160K spirited miles, our colleague who drives a thousand miles for a very good sandwich will not catch you.
Keep up the pace and your good Werks.
Note for you folks out of CA, the road condition Wayne described. Trucks have so punished the right lane of I-5 between NorCal and SoCal that it's becoming one left lane of travel N or S for hours.
//frabjous
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 6,165
Likes: 1,930
That broken light was a garage repair the next day. In retrospect, it probably should have broken before this ...
There is seldom a drive on the West Marin roads that doesn't involve some air time. The roads in the South Bay are so much better!!!!
And there was that Sierra drive a couple weeks ago with the suspension full stiff as the DSC had "failed" (fixed later with a full power off reset). Lots of sliding that day as the tires weren't really interested in maintaining surface contact.
And last week's Lost Coast drive was, let's just say, interesting!!!!! It's great to have adventures
Just over 161K now and still running like new. Amazing cars, these are.
And I think I am already behind in mileage of the aforementioned friend who drives a thousand miles for a sandwich
He should be about due to visit my garage for another oil change
There is seldom a drive on the West Marin roads that doesn't involve some air time. The roads in the South Bay are so much better!!!!
And there was that Sierra drive a couple weeks ago with the suspension full stiff as the DSC had "failed" (fixed later with a full power off reset). Lots of sliding that day as the tires weren't really interested in maintaining surface contact.
And last week's Lost Coast drive was, let's just say, interesting!!!!! It's great to have adventures
Just over 161K now and still running like new. Amazing cars, these are.
And I think I am already behind in mileage of the aforementioned friend who drives a thousand miles for a sandwich
He should be about due to visit my garage for another oil change