987.2 Boxster S Cam/Crank issue
Discussion
Help!
Bought the above (2011 Boxster S 987.2) privately 2 months ago, Drive home was fine, later that evening car went into limp mode displaying fault "crankshaft/camshaft limit value exceeded" and "camshaft sensor 1 limit exceeded". - cam to crank correlation error.
Initially there was suggestion of a stretched chain but as this comes as part of the short block Porsche said this was extremely unlikely as 3 main dealers had never replaced this on the DFI engines.
Upon inspection the sensors were non-genuine so the decision was made to replace the sensors but as i wanted to replace the clutch anyway the engine was removed with the following work completed with all Porsche parts (might sound overkill but the car was going to be a keeper)
Replaced cam and crank sensors
Checked wiring to sensors
Replaced cam chain tensioners
Replaced weeping cam cover gaskets
Cleaned out all port holes
Full service (spark plugs etc)
Replaced clutch, flywheel
As well as a few remedial bits while the engine was out.
Engine then refitted and road-tested for 3/4 days all okay. Faults gone and running perfectly.
3 miles after i picked her up and got home she wouldn't start. Ignition would turn but nothing happened - seemed electrical. Recovered back and recoded - now working.
3 miles after i picked her up again went to refuel and wouldn't start again. This time it would crank but just stuttered and wouldn't start. Recovered again and ALL the previous fault codes above have re-appeared.
All the work has been completed at a respectable independent and followed the advise of Porsche main dealers too.
I'm stuck and broke.
Anyone have any similar faults or ideas at all?
Any help very much appreciated!
Bought the above (2011 Boxster S 987.2) privately 2 months ago, Drive home was fine, later that evening car went into limp mode displaying fault "crankshaft/camshaft limit value exceeded" and "camshaft sensor 1 limit exceeded". - cam to crank correlation error.
Initially there was suggestion of a stretched chain but as this comes as part of the short block Porsche said this was extremely unlikely as 3 main dealers had never replaced this on the DFI engines.
Upon inspection the sensors were non-genuine so the decision was made to replace the sensors but as i wanted to replace the clutch anyway the engine was removed with the following work completed with all Porsche parts (might sound overkill but the car was going to be a keeper)
Replaced cam and crank sensors
Checked wiring to sensors
Replaced cam chain tensioners
Replaced weeping cam cover gaskets
Cleaned out all port holes
Full service (spark plugs etc)
Replaced clutch, flywheel
As well as a few remedial bits while the engine was out.
Engine then refitted and road-tested for 3/4 days all okay. Faults gone and running perfectly.
3 miles after i picked her up and got home she wouldn't start. Ignition would turn but nothing happened - seemed electrical. Recovered back and recoded - now working.
3 miles after i picked her up again went to refuel and wouldn't start again. This time it would crank but just stuttered and wouldn't start. Recovered again and ALL the previous fault codes above have re-appeared.
All the work has been completed at a respectable independent and followed the advise of Porsche main dealers too.
I'm stuck and broke.
Anyone have any similar faults or ideas at all?
Any help very much appreciated!
If it's definitely true that the car has at times run faultlessly after being "road-tested for 3/4 days" that implies it's not a major mechanical fault. If it was a mechanical fault like a stretched chain, you would not expect it to run faultlessly for several days before the fault code returned.
Instead, that implies something more along the lines of an electrical, sensor or wiring issue. But, of course, seemingly impossible things do happen. I'm slightly sceptical just how much the car was road tested and that the reality may be nearer to car was taken out for a quick zap and seemed fine, but that's another story. Anyway, I doubt anyone on here is going to come up with an answer.
Problem you've got is that it's hard to know what steps to take next while the fault is unclear. You could fit a breaker sourced replacement engine and still have the fault if it's something in the loom or ECUs.
If your indy can't fix it, you either have to try another indy or dispose of the car. Having dealt with a lot of UK indy's, if I had a difficult car like this, I'd be booking it in with Precision Porsche in Uckfield and getting the guy works there and goes under the username Demort on 911uk.com to work on it.
The guys at Cotswold mentioned above are good too, as are a number of other outfits one could mention. But for this kind of fault finding, the above is where I would go.
Instead, that implies something more along the lines of an electrical, sensor or wiring issue. But, of course, seemingly impossible things do happen. I'm slightly sceptical just how much the car was road tested and that the reality may be nearer to car was taken out for a quick zap and seemed fine, but that's another story. Anyway, I doubt anyone on here is going to come up with an answer.
Problem you've got is that it's hard to know what steps to take next while the fault is unclear. You could fit a breaker sourced replacement engine and still have the fault if it's something in the loom or ECUs.
If your indy can't fix it, you either have to try another indy or dispose of the car. Having dealt with a lot of UK indy's, if I had a difficult car like this, I'd be booking it in with Precision Porsche in Uckfield and getting the guy works there and goes under the username Demort on 911uk.com to work on it.
The guys at Cotswold mentioned above are good too, as are a number of other outfits one could mention. But for this kind of fault finding, the above is where I would go.
Thanks guys all very helpful.
I know the car was extensively road-tested because it completed 100 miles at my request.
The timing was checked and all fine. I agree it just cant be mechanical when half the time its fine. The faults tend to happen when the car is warm.
The faults showing are Camshaft Sensor 1 + 2 Exceeds limit value and Intake Camshaft Position Timing, Bank 2 implausible.
I'm still debating what to do next....
I know the car was extensively road-tested because it completed 100 miles at my request.
The timing was checked and all fine. I agree it just cant be mechanical when half the time its fine. The faults tend to happen when the car is warm.
The faults showing are Camshaft Sensor 1 + 2 Exceeds limit value and Intake Camshaft Position Timing, Bank 2 implausible.
I'm still debating what to do next....
I put this into Google:
The faults showing are Camshaft Sensor 1 + 2 Exceeds limit value and Intake Camshaft Position Timing, Bank 2 implausible.
The search string came up with several threads on other forums and whilst not providing a straightforward fix, they might lead you on a road to help identify the actual issue. Although some threads are VW/Audi faults, I'd imagine the diagnoses & sensors would be similar .Is there a fault number code, eg P12345 which might help direct your search even more.
Good luck.
The faults showing are Camshaft Sensor 1 + 2 Exceeds limit value and Intake Camshaft Position Timing, Bank 2 implausible.
The search string came up with several threads on other forums and whilst not providing a straightforward fix, they might lead you on a road to help identify the actual issue. Although some threads are VW/Audi faults, I'd imagine the diagnoses & sensors would be similar .Is there a fault number code, eg P12345 which might help direct your search even more.
Good luck.
Hi, they should be able to read camshaft deviations with the diagnostics they have, you then look at if live readings are also fluctuating, or is the dme misreading the info. I wouldn't have thought it would be mechanical, as you would expect it to be more frequent
There may be an opportunity to scope both sensors.
The post states timing chains not sold separately, but they are shown at £148 each.
Do you work with Paul, in Bristol, if yes i have your codes, and will put into the Porsche online fault finding section, this may give more information.
Chris
Chris-596aj said:
Upon inspection the sensors were non-genuine so the decision was made to replace the sensors
Replaced cam and crank sensors
Checked wiring to sensors
The non-genuine sensors peaked my interest Replaced cam and crank sensors
Checked wiring to sensors
This is not the sort of part someone would just replace I'd guess unless they were already chasing a problem
So perhaps this problem has been ongoing with the PO before they sold it to You and if this is correct maybe they gave up before the problem was properly diagnosed and then fixed
All guess work obviously
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