Welcome aboard. Please take a minute to click user cp and edit details to add your vehicle and location to your profile, it's often useful information when you're seeking assistance.2001 E320 w/80k miles. Experiencing extended cranking on start after car sits for a day or so. Runs fine once it starts. Have serviced fuel system and replaced Crank Position Sensor a year ago.
Any thoughts or ideas?
That sounds about right. Stay cool out there, and thanks for chiming in.I think you may be thinking of my thread?
From my previous Mercedes this is the classic 'leaking check valve' symptom. I think perhaps my "mostly when warm" may be a bit misleading as I remember it happening when either warm or cold. I only had 11psi immediately after shutting off the engine, so perhaps your pump is not bleeding down as quickly?! Pressure test is the best place to start.Symptoms sound about right, but mine is when the car has sat for a while. It will restart fine on short stops, but it gives extended crank after sitting overnight or for a day or two. I'll work on checking the residual fuel pressure.
Any thoughts on the difference in symptoms?
Makes perfect sense. I'll start with the pressure test.From my previous Mercedes this is the classic 'leaking check valve' symptom. I think perhaps my "mostly when warm" may be a bit misleading as I remember it happening when either warm or cold. I only had 11psi immediately after shutting off the engine, so perhaps your pump is not bleeding down as quickly?! Pressure test is the best place to start.
Yes, through misunderstanding.I have the exact same problem with DB. After I replaced the fuel pump (Pierburg), the extended crank still remains. Then after driving for about half an hour, the check engine suddenly illuminated. There is no code nor warning at all (i.e. "No malfunction" still on).
Any idea how this comes about?
Hey Greg,Yes, through misunderstanding.
Here is the correlation between the CEL and the malfunctions displayed in the cluster: ZERO, ZIP, NADA, BUPKIS.
The only way to determine what a CEL means is to follow my user name.
My apologies for any hurt feelings, that was not my intent. Rather, that is a fairly common misconception, so that response was geared in part to drive home the point for others who might search and find the thread.Hey Greg,
I may not know as much as you do, but I have owned this E320 for 6 yrs and have done many DIY with the help of this site. Just for your information, I do know what the difference between CEL and malfunction displays. I just presented all symptoms shown in my car for my problem which I found to be similar to DB in case somebody may ask.
You do not need to be nice in your reply but I found your response a bit unnecessarily sarcastic, especially when you capitalize those words.
Definitely check the fuel pressure.pdttn
If you have replaced your CPS and fuel pump, the other problem may be a bad coils. Going back to extended cranking, in fuel issue, the injectors may leak. Other than fuel, coil and plug wire may play a role. If you have CEL, you should able to get a code as Greg said. So it may be wise to arm with a fuel pressure tester from Autozone for $50 before replacing the fuel pump or CPS.