Cayenne S startup issues

[KHalvorsen]

Anyone have any experience with a Cayenne S with poor startup? My Dad has a 2004. It will crank quite a while sometimes before starting. Sometimes it starts perfectly. He just replaced both pumps, regulator, and filter thinking it was related to one of those items. No dice.

Follow-up question. At hard acceleration it will pop through the manifold like it is running lean. This may or may not be related. This problem has existed before the aforementioned issue.

[Jack Stands]

I’d wonder about the air/fuel ratio being lean. Probably best to have it scanned for codes rather than just throwing parts at it.

[island911]

Poor starts when hot?

Does it have codes (check engine light on) ?

There is the crank sensor (reads the flywheel position) Those can start to flake out and give this hard start problem.