Twintipin13

A PPI is being performed on a 2009 Cayenne GTS I am looking at right now. Bore scope shows small amount of wear on the cylinder walls. How much is too much wear?
The shop says it shouldn't be anything to worry about, just want to get your opinion.

deilenberger

Need photos of wear to access it. Generally the bores on these are so hard there is no wear evident unless some seizing and scoring has been happening. I seem to recall another Canada GTS that was here because of a bad cylinder - where it basically needs a new engine. Hope it isn't that one.

19psi

v10rick

If this were a Florida GTS maybe but where you are FORGET IT.
The area to be most concerned about is the cylinder area below the piston, only visible from the underside of the engine.

hahnmgh63

We need to know the definition about a small amount of wear? As mentioned, you shouldn't really see anything except the crosshatching. I bore scoped my '06 CTTS at 65K and the original cross hatching still was showing, no scratches of any kind. So once again, what constitutes a small amount of wear, did they take pictures? My Snap-on BK6000 takes nice pictures and videos.

Twintipin13

I am waiting on confirmation of what was seen, if it was wear on the walls or the crosshatching.

Also, I was told the timing chain was not looking to be 100%. In all my cayenne research over the last year I have not seen anything about timing chains to be a weak spot on the V8. Is this something I need to look further into or are the chains solid on these V8s?

ScootCherHienie

While the 957 series '08-'10 was improved compared to the 4.4L V-8 in 955s, Cayennes in areas with cold winters are especially susceptible to cylinder wall wear on 1 or more cylinders. The cylinders have a hard coating that was either not correctly formulated or not correctly applied with the result being that in cold climate starts, the cylinder surface can be damaged. Oil consumption goes up once this begins and that has to be fixed in order to not ruin the 4 catalytic converters and potentially cause check engine lights/codes. There is no fix other than replacing the engine... the coating on the cylinders is so thin, it cannot be machined and parts of it will be missing if there is wear in the cylinder--and these engines just do not work right without that coating. Most of us here wouldn't buy a 955 or 957 Cayenne that has spent a fair portion of its life in Alaska, Canada, Montana, Idaho, Wisconsin, Maine, and other northern states with bitter cold winters.

jeff spahn

Mine has lived in Minnesota (until I purchased it in 2017 and moved it to Iowa) all 175,000 miles of its life before I owned it. No issues.

Twintipin13

These are some screen grabs from the bore scope video, they were taken from the drivers side front and rear cylinders

deilenberger

Run Away, Run Away

Those photos do not inspire confidence in that engine. Especially the ones with pits in the cylinder walls.

TomF

^^THIS^^

Cheers,
TomF

19psi

Holy crap
The PPI saved you a lot of heartache but the advice of it being nothing to worry about was way off.

I feel bad for the person who does end up buying that.

nodoors

Agreed. Don't buy that car.

If they pay you $100 to take it and you have a lot of patience, alternative transportation for the next 2 months, and the desire to do a very complex/expensive engine build maaaybe you should consider it. That biotch is going to need an engine somewhere between 200 miles down the road December of this year in Canada.

Twintipin13

Haha thanks guys. Sounds like the best thing to do it stay away from this thing. It's too bad, the thing is beautiful and was a blast to drive. Oh well, the search continues.

v10rick

The lower section of the cylinders that you cannot see must look much worse.

The next owner will likely show up here wanting to know about the ticking sound.

He purchased anyway because the dealer assured that it was a minor issue covered by the 30 day warranty.