P0003 It says fuel volume Reg control circuit low
P0603 says internal control module keep alive Mem Kam error

I was cruising about 70mph in sport mode ... stomped on the accelerator hit about 110mph and the check engine light came on. It went away within a quarter of a mile. I have a COBB tune, sport cats, and 22k miles on the car.

thoughts? concerns?

Thanks in advance for your help

 

You sure the code is "P0003" and not "P0300"?

Anyhow, a quick search turned up a few instances of "P0003" error and the problem appears to be related to past their change by miles plugs and possibly questionable gasoline.

With a tune and a Turbo plugs are going to have a short life. And good gasoline is critical. Buy from a busy station to ensure you get the freshest gasoline. And of course be sure you buy the right grade of octane.

 

Yes.

I read that too. What is the best plug for a tune, and why do you replace coils? Is there a hotter coil out there ?

 

For plug recommendations my advice is to use the plug the tune maker suggests. If there is no recommendation I wonder about the tune...

Absent any misfires coils get replaced either because when the plugs are done the coils (maybe only one or two) show signs of aging/degradation.

In the case of misfires these can be coil related, but not always.

I have no 997 Turbo experience but I have had the plugs replaced in my stock 2003 996 Turbo several times and never noticed any improvement from the engine.

But 5K miles or so back (at around 145K miles) I had the coils replaced to address cold misfires. The plugs were changed too even though they had around 10K miles to go before reaching their replacement miles.

The good new is the engine ran better. Because I had changed the plugs before with no improvement I attribute the improvement to the new coils. Might add while the coils were original they looked just fine.

(The bad news is the cold misfires remained. These I think arise from a couple of lazy intake valve lifters which are slow to switch from high lift to low lift at cold engine start. Fresh oil doesn't make any difference. Even 2 bottles of Swepco 502 Oil Treatment didn't help.)

Based on my 996 Turbo experience I could offer the opinion that at every 4th or 3rd plug change the coils get changed too. (My Boxster experience is that even after 306K miles the original coils appear to be just fine.) Tuned engines might benefit from having the coils changed every 3rd or even 2nd plug change, unless of course the tuner provides another schedule for coil changes.

Oh, coil recommendation. Since my Turbo is stock I have the tech install whatever coil comes up with the correct part number. In your case I refer you back to the tune maker for a coil recommendation.

The stock coils are pretty "hot". They have to produce a spark when the Turbo's making boost so the stock coils are pretty good. Absent any other (better) recommendation you might be ok sticking with stock although maybe replacing them more often.