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New to the forum. Had not been inside a porsche engine for 25 years. Friend came to me with his "blown" cayenne.
Backstory.
- 2012 Turbo, purchased used from dealer, dealer maintenance on schedule, 110k
- threw a service light. Porsche told him something about gas cap problem and ordered new cap. Might have been evap system code. Service tech cleared him to drive while waiting for part.
- threw another code.
- in the 3 day window before they of could be brought in, the intake manifold blew up on a restart in the local shopping store lot.
, towed to Porsche.
- Service Manager reports they have only seen it happen once before and it would need a new engine.
- I had them boroscope it, do a leak down test, and hand turn the engine 720.
- obvious eak down failure on 2 cylinders. Found very small shavings in oil. Something major.
, Porsche dealer only offering new motor. Friend asked me to rebuild or used for half.
Ssoo, here we go.
1) Need workshop manual. Quick research shows no printed material. PIWIS($$$)or alldatadiy(???). Anybody been in this deep and recommend a source. Friend is going to talk to Porsche and see if he can swing something.
2) initial info suggests the cradle has to be dropped vs pulling the engine engine out if the top. Can it be pulled, or is it that much easier to just drop. I have access to lift etc, but need to reconstruct the front suspension to roll it if the lift while waiting for the rebuild process. Assume suspension can be put back in. Any one do this?
3) will be pulling heads etc to inspect for source of shavings.
A good friends wife was driving her low mileage 2014 Cayenne Turbo. Big explosion and loss of power with no warning or check engine light. The intake manifold exploded hard enough to dent the hood. He was told that it was caused by a bad fuel valve.
Has anyone seen something like this happen? They are submitting a claim to corporate as the dealer thinks it is due to a manufacturer defect.
Update, did a little more searching on the site. Will be dropping the engine. Clearly will need a could of rolling tables and am an engine stand to
- separate engine and tranny for seals and tc update
- take engine offof the subframe so I can mount it back on the car with the wheels in order to free up the lift
Usually not on a 2012. What did the Porsche dealer say was the cause of the failure.
Yep, huge kaboom. Dealer sent pictures of what was left.
As for cause, they wanted permission to do tear down, at their rate. Advised it would be 4k +just for diagnostics, and they might still have to put a new motor in. Friend was not prepared for a new motor. So used it might be.
1st, fuel vapor, mixed and pulled into the cylinder via vacuum, would have to remain or get blown back into the intake. Then, some sort of spark applied.
a) If cam timing is off, incorrect opening of valves would allow the above. Will need look at chain alignment and verify valve train.
b) bad valve spring that would allow a valve to "hang open" could also produce same result.
The leak down test affecting 2 cylinders, on opposite sides (cyl 1 & 8) suggest spring or cam problems at the ends of the shaft - higher stress areas.
Won't know till I get it, drop it, and pull it apart.
Once again, 1st time Iin a ong time inside a porsche engine. So any advice on what to watch for when dripping a 92A would be useful.
I understand that Porsche increased HP on later motors. This is likely a bigger hp.
- was increase achieved via the computer or something mechanical
- would this 2017 motor use same harness, mounts etc?
I understand that Porsche increased HP on later motors. This is likely a bigger hp.
- was increase achieved via the computer or something mechanical
- would this 2017 motor use same harness, mounts etc?
02-19-2020, 09:15 PM
2012 Turbo, Blown intake and rebuild time
