Start-up issue - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Jul 19, 2009 | 11:30 AM

007-911

Thread Starter

Registered User

Joined: Apr 2009

Posts: 507

From: Bloomingdale, IL

Rep Power: 49

Start-up issue

Hello Guys,

lately, when my car has been sitting for about 8-10 hours and I start up the car the RPMs bounce up and down for a few seconds and then its fine. Anyone know the cause of this?

What should I replace or get looked at? Or is this normal?

Vince

Jul 19, 2009 | 11:48 AM

BlackHorseTurbo

Registered User

Joined: Jul 2008

Posts: 5,301

From: Houston

Rep Power: 607

A boost hose is probably loose. Check for a leak. Probably a loose clamp.

Jul 19, 2009 | 12:50 PM

007-911

Thread Starter

Registered User

Joined: Apr 2009

Posts: 507

From: Bloomingdale, IL

Rep Power: 49

I did that already, I took it to a shop, I changed out the boost frequency valve and upgraded to samco hoses. I a getting a pre-cat o2 sensor code, Im going to change that tomorrow. I had them do a pressure test and everything looked fine. what else could it be.

Jul 19, 2009 | 03:27 PM

Tony@epl

Former Vendor

Joined: Apr 2008

Posts: 975

From: CT

Rep Power: 0

Vince, this is related to your secondary air issues.

Your secondary air pump only running for a few seconds on stone cold engine.....the exact time your car is having a bouncing idle. Coincidence? I think not =).

Get your car healthy!

Last edited by Tony@epl; Jul 19, 2009 at 03:59 PM.