Thanks in advance for your help. I have a 95 S320 with 80K. Recently when I go to start the car, it takes about five to seven seconds of cranking before it will start. I changed the fuel filter with no results, then I replaced the fuel regulator with no results. No codes and no other symptoms. Spark plugs and wires were replaced within the last year. Also recently replaced the engine wiring harness.

I don't hear any noise from the fuel pump and like I said once it starts it runs great. If you turn it off and immediately restart it will do so with no problems. If it sits for awhile or first thing in the morning, it takes 5-7 seconds for the engine to crank.

Any suggestions on what to try next? Should I go ahead and replace the fuel pump. kind of confused without any codes to point me in the right direction. Thanks for your help.

Shayne

 

Sounds like the fuel rail is bleeding its pressure away.
You need to check pressure is still there in the morning??

Bazzle

 

I get a little black smoke upon starting. That suggests that I have too much fuel. Do you think that the injectors are leaking and it must burn excess fuel proir to starting? Funny that first thing in the morning sometimes it starts without hesitation and the remainder of the day it takes 5-7 seconds of cranking. Furthermore, if you turn off and immediately restart it does so without problem. Just Confused. any advice is appreciated. New fuel injectors sounds like an expensive guess.

 

Towards the front of the engine , on the fuel rail there's a pressure regulator. It has a vacuum line attached to it. Start the engine and then shut it off. Pull the vacuum line off and see if fuel is dripping from the metal nipple. If you see fuel, you need a pressure regulator. It's easy to replace, it's held in with a snap ring. Just be careful and let it sit for awhile before you remove it.