Query re Fault codes p0300, p0301, p0302 , p0011

[kwack]

Re: http://911uk.com/viewtopic.php?t=148293&start=0&postdays=0&postorder=asc&highlight=

I've been watching the above with interest as I have same symptoms with fault codes p0300, p0301, p0302 and p0011

The specialist has replaced the camshaft solenoid already twice and still same issue

So have booked into another specialist now to see if they can fix it

 

[deMort]

Watching with interest as I have same symptoms with fault codes p0300, p0301, p0302 and p0011

The specialist has replaced the camshaft solenoid already twice and still same issue

So have booked into another specialist now to see if they can fix it

Fault codes are for misfires on cylinders 1 and 2 plus 1 code for inlet camshaft control .

What the car is detecting or seeing outside of limits is in the first part of the fault code below .

The garage would i have assumed with this fault code replaced the camshaft variocam solenoid and not the high lift one Newbe is .. if they replaced 2 then perhaps they replaced both.

The fault code doesn't actually say which bank it is although i assume B1 .. either way i would be looking at the values of the variocam on both banks with a tester on a road test ..

I would look for an intermittent or constant out of specified range compared to the specified range for each bank .

Depending on what i saw , what temp .. rpm etc is where i would go next .

fault code options are again on the fault code list below .. they are just suggestions though and sometimes the actual fault is not in the list .


EDIT ..

Is this a car you have just bought and the one with the recent engine rebuild??

 

[kwack]

Sorry for hijacking thread but this info is super useful

1) Yes this is a car purchased a month ago under warranty and has had a full engine rebuild by a well renowned specialist.

The car has been back twice with the same issues, cold start fine then once drive off and stop at traffic lighs etc within 5min the misfires occur, engine check light, but once driving off again the light disappears and engine runs fine.

All things I am led to believe point towards the solenoid or so I am keep being told. As part of the rebuild all 4 were replaced, one now found faulty and replaced again, but still the issues persist

1st couple of drives since the last replacement, no issues 3rd drive same crap again....

Is it a case of just replacing parts until it is resolved?

Thanks
Kwack

 

[deMort]

I've asked for this post to be split into a seperate one as you will probably get more answers that way .

If you didn't have the fault code P0011 then i would be saying you have stuck tappets .. i change the solenoid for the high lift first but i'm always conscious it can actually be the tappets themselves .

There is no check for these other than an expensive head strip and replacement hence we try to rule out as much as possible first .


Your issue from the fault code P0011 relates to the camshaft vario cam timing .. this is an oil fed pressure controlled system which basically moves the position of the camshaft relative to the timing chain .. i believe its plus or minus something like 25 degrees for your car .

So in essence your fault would be the car says vario cam move to +16 degrees and 5 seconds later it looks and says .. hold on your only at 12 .. that's not what i told you .. it then flags a code as it has no way of telling off the vario cam unit !

The list of items that can cause this are in the fault code i posted ..


BUT .. we now have the complication that it has had an engine rebuild so this throws in the human factor ..

In this case there is a possibility of swarf or debris in the oil ways for the head or camshaft .. also it means a removal of the vario cam is becoming more likely not only to check but also to blow out the oil ways .

I'm pretty sure there is a filter in the head as well which may be compromised .. i would need to investigate that part though as i'm not a natural engine builder ( it's not what i do these days )


Either way the first step for me would be to look at the values for camshaft control on both banks ... depending on the readings is where i would go .. it's not necessarily the Vario cam system .

We Certainly don't just throw parts at something in the hope it will fix a problem and i really hope that's not what the garage is suggesting .. no offence there young man

Diagnose first then repair .


A little light reading is enclosed below to explain how these work .. 996/997 are pretty much the same .

 

[infrasilver]

BUT .. we now have the complication that it has had an engine rebuild so this throws in the human factor ..

In this case there is a possibility of swarf or debris in the oil ways for the head or camshaft .. also it means a removal of the vario cam is becoming more likely not only to check but also to blow out the oil ways .

I'm pretty sure there is a filter in the head as well which may be compromised .. i would need to investigate that part though as i'm not a natural engine builder ( it's not what i do these days )

There is a filter behind the cam actuator, a little barrel shaped one

This just reminded me of my issue after I'd rebuilt my engine and the first rolling road session picked up that I had a cam actuator problem, fault code P1341.

The oil holes had spun on the actuator sleeve but when I re-installed them I didn't notice, it was obvious when I removed them to inspect, I just wonder if something similar has happened. They obviously get loose with age and need a small punch to re-secure them

About 2/3 of the way down this page

http://911uk.com/viewtopic.php?t=141208&postdays=0&postorder=asc&start=240

 

[deMort]

Excellent .. that may well be the issue here .. i had a feeling there was a filter but wasn't sure .

Your code is almost identical to that of a 997 fault code .. p0011 in this case .

 

[kwack]

Thanks for splitting the thread I didn't want it to turn into my specific issue

I am going to rebook into a local specialist rather than have it carted back up north again

Would the above explain why it works fine after about 5 min once it comes comes off choke so to speak

I experience no misfires once it's warmed up or above say 2k or idle?

I really don't want to have to teach specialists to read internet forums to diagnose issues they are supposed to know how to do themselves but if I must!!

Thanks
Kwack

 

[deMort]

The issue is the fault code for vario cam .. this is what needs investigating ..

I know what i would do and what i would expect any Indy to do and that is look at the values ... it can be proved or disproved at that point giving us a direction on where to look next .

You certainly shouldn't need to pass on info like this .. i posted it merely to give you an insight into what seems like the issue ... for a garage to need it and to be honest .. they are not a Porsche Specialist as its basic knowledge on how this system works .

Infrasilver has offered a possible fault with the filter or solenoid but as this has been replaced then the filter is possible .. either way i don't consider this a difficult problem to find .. i may be wrong but from reading it doesn't seem so .

As previously said .. if no vario cam code then i would go for a tappet fault and your symptoms would lean that way as its typical high lift issues but the code over rules that and Must be investigated first .

High lift solenoid issues .. they are not there above 3K rpm .. hence my leaning that way but you will Never get a camshaft fault code for this problem ... thats why im moving away from high lift issues .

Garage looks at values for camshaft .. they can then move on from that if needed .. i know i would .


EDIT ..

Feel free to pass this on if you wish .. personally i would be embarrassed if i needed it and if offered out of hand .. i would thank the customer and quietly put it to one side then carry on with my job

I have done so in the past from well meaning customers .

Second Edit .. make damn sure you tell the new garage everything and that the engine has had a rebuild .. that could possible make a lot of difference ..

In short .. ALWAYS tell a garage everything you possibly can .. it will in the end make the job cheaper ... they don't care how long you spend telling them .. Only that you tell them everything .


That reminds me .. i need to do a new thread on giving garages all the info !!!

 

[kwack]

Many thanks demort for the explanations

This is all very useful for my understanding of how this works

The specialist who built the engine has had the car back twice to resolve AND I have told them about the fault code p0011. The explanation I got back was that this gets thrown up for a number of reasons. Hence they replaced the solenoid and I was advised that the gauzes whatever they are were also cleaned. The spinning of the filters does look plausible

I was expecting after two stabs at the cherry for this to be resolved and not to have the car back again and within 2 drives the error reoccurring.

As you say the code p0011 is key and when I speak again will ask how this was investigated

I am going to book into a local specialist whom I will update with the full story and hopefully get to the bottom of this issue once and for all and I can finally enjoy the car.

Will keep this post updated as to the outcome

Thanks
Kwack