Long crank cold?

TPRICE0308

MEMBER
2006 MERCEDES BENZ C230
2.5L
6 CYL
2WD
AUTOMATIC
150,000 MILES

Long crank cold going on for 1 year. Need help interpreting recent fuel pressure test. Car not started in 2 days prior to test. With key to ignition position, gauge from 0 to 30 psi with drift down to 15 over 4-5 minutes with key left in ignition position.

With start, gauge to 54 and no significant change with revving the engine. All done with vacuum hose in place.

Can this be normal? Is it definitive for a fuel sender malfunction? Since it has been stable for over a year, is there any need to fix it?

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,289 POSTS

The fuel pressure test sounds normal, I would do a throttle bore cleaning service and run the codes to see what comes up. Only a vacuum leak test wouldn't hurt, here are the guides to help you with the problem and instructions in the images below to help you with your car.

https://www.2carpros.com/articles/throttle-actuator-service

And use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please go over these guides as well:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

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