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Discussion Starter · #1 ·
This code popped up today after hearing the engine knock and a few exhaust pops today. Just fueled the car yesterday and added half a bottle of lucas oil's octane booster.
Anyone have any experience with this?
 

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ouch. the Lucas Oil snake oil is probably the culprit. I wouldn't put any additives of any sort in newer cars.
 

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ouch. the Lucas Oil snake oil is probably the culprit. I wouldn't put any additives of any sort in newer cars.

^^^^

Per Lucas website, not legal for street use

Per Porsche for 987/997 cars, do not use MMT - possible damage to emissions

From PCA "The ... EPA has banned its use in the formulated gasoline ... California has imposed a total ban on MMT."
 

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The sequence of events you Posted should be a clue to the cause.-Richard
 
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Discussion Starter · #5 ·
Thanks for that info. Makes sense. Going to pump out that fuel from the gas tank and see if the problem continues.
 

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+1. Your car shouldn't be knocking, but if it does, octane booster isn't the answer. You'll need to find out what's really going on.
 

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This code popped up today after hearing the engine knock and a few exhaust pops today. Just fueled the car yesterday and added half a bottle of lucas oil's octane booster.
Anyone have any experience with this?
Unless there is a tremendous amount of carbon build-up or bad gas was pumped into the gas tank, new engines should never knock. Knock sensors are used in virtually all new vehicles built today. These block-mounted sensors work like tiny seismometers that measure vibration patterns throughout the block to identify knock in any cylinder. Relying on these sensors, the engine controller can keep each cylinder's spark timing advanced right to the hairy edge of knock, providing peak efficiency on any fuel and preventing the damage that knock can do to an engine.
Any car that develops a knock or ping should immediately be taken in for service, since engine knock is among the most disturbing problems a vehicle can have. Basically, engine knock occurs when the air/fuel mixture inside a cylinder is incorrect, which makes the fuel burn unevenly. Under normal conditions, the fuel burns in pockets, rather than in one giant fireball within, and when each pocket of fuel burns, a shock occurs that burns the next until all the fuel is burned in that stroke. When a knock is present, the pockets don't burn evenly, causing shock waves at the wrong times that can damage the cylinder wall and the piston itself.
 

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Discussion Starter · #8 ·
Thanks for the feedback. I Can't recall ever hearing a knock prior to this event. I have experienced a stutter in acceleration on the bottom side, say 1800-2800 rpm it seems the car hesitates until it gets above 3k rpm. The octane boost was added in an effort to allocate some of this issue. It seems evident to me that it had little to no impact. I say that because I drained the tank today, filled up with chevron premium and the problem persisted. No knocking. Just the code being thrown and the engine going into limp mode. I found this thread on Rennlist that seems to coincide with my issue.
Reduced engine performance problem - Rennlist Discussion Forums
But, I'm not an engine specialist! I have a good ear for the tunes she plays. I know shes off tune!
give me some more feedback here guys! Anyone know if the same cam positioning sensor is used on the 981 as the GT3?
i know my car is an early 2013 production car. Maybe I'm in the same batch as this fellow on Rennlist?
 

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This code popped up today after hearing the engine knock and a few exhaust pops today. Just fueled the car yesterday and added half a bottle of lucas oil's octane booster.
Anyone have any experience with this?
There should be an error code associated with the behavior. I'd advise you read this code (or codes and be sure you retrieve any pending codes as well) and let the codes provide you with some ideas as to what is going on.

In the meantime, I would advise you to avoid running the engine any just in case. I never like to continue to run an engine when it is acting up.
 

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Discussion Starter · #10 ·
Update
im told it's the "high pressure fuel pump that sits on top of the camshaft"
anyone else have this same issue?
 

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No direct experience but the high pressure fuel pump on DFI engines has been known to fail, sometimes outright, other times intermittently. Occaisonally the low pressure fuel pump can fail (outright or intermittently) and either pump not working right seriously impacts the engine's output/behavior.

I would advise you get the car to a qualified shop and have the diagnosis confirmed and the pump replaced if that is what it is.

I would also advise you to resist continuing to drive the car with this problem until after it has been resolved.
 

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Discussion Starter · #12 ·
Rockster-
porsche did diagnose the car this week. It's still under warranty. Thanks for the info. I just hope this is the remedy.
 
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