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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53461
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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My ml 350 doesn't start right away, I have to keep trying

Customer Question

my ml 350 doesn't start right away
JA: Thanks. Can you give me any more details about your issue?
Customer: I have to keep trying for several minutes before it finally starts
JA: OK got it. Last thing — Mercedes Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 11 months ago.
Category: Mercedes
Expert:  Lou P. master tech replied 11 months ago.

Hello. Most times this is caused by a weak fuel pump. Have you replaced any parts or done any testing ?

Customer: replied 11 months ago.
no
Expert:  Lou P. master tech replied 11 months ago.

Ok so get a fuel pressure gauge and install it at the passenger front of the fuel rail. When you first turn the key on it should prime up to 50 psi + tell me how long or how many cranking times it takes to build pressure.

Customer: replied 11 months ago.
sometimes it starts right away other times it takes several times before it turns on some times ten minutes
Expert:  Lou P. master tech replied 11 months ago.

Understood , are you able to get a fuel pressure gauge and do as I suggested ?

Customer: replied 11 months ago.
no fuel pressure gauge
Customer: replied 11 months ago.
when I turn the fob I get nothing until it decides to start
Customer: replied 11 months ago.
when it does decide to start it starts
Expert:  Lou P. master tech replied 11 months ago.
Oh ok that helps! So when you turn the key you should feel 2 solid clicks and it should turn smoothly is that how it feels ?
Customer: replied 11 months ago.
I get nothing until it decides to start. even the display goes out while I'm trying to start the car. I keep trying then it will finally start
Expert:  Lou P. master tech replied 11 months ago.

ok that tells me that it very well could be the ignition switch. do you know how to do wire testing or will you have it taken to a shop?

Customer: replied 11 months ago.
switch is good
Expert:  Lou P. master tech replied 11 months ago.

ok i will opt out.

Expert:  Marty replied 11 months ago.

Hi Doug, my name is***** you still like some help with this problem?

Customer: replied 11 months ago.
my problem is when I try to start the car with the key fob it takes numerous times before it starts
Expert:  Marty replied 11 months ago.

Ok, can you explain a bit more about the no start? Does the starter crank the motor but the motor won't fire? Or does nothing at all happen when you turn the key?

Customer: replied 10 months ago.
nothing happens at all then after several tries it will finally start. no clicking no lights I just keep turning the fob and then it starts
Expert:  Marty replied 10 months ago.

I noticed previously that you said the ignition switch was good. Did you replace the switch?