Q: Mercedes Diesel takes 30 to 40 sec to start every time cold or hot

asked by on

its a ml 270 with a 5 cylinder diesel engine.my car has hard start all the time.could it be something like the loss of high pressure from the common rail?

My car has 160000 miles.
My car has an automatic transmission.

You could be right about the fuel pressure. The system is supposed to maintain a certain amount of pressure while it is off and if that pressure falls off it may take some time for it to build up again. But it could also be any number of other faults. You didn’t say whether there is a check engine or other warning light, but I’m betting that your ECU has stored some fault codes that could lead to the diagnosis. If you contact Your Mechanic they can send a technician to your home or office who can check out your starting problem and let you know what needs to be done.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Mercedes Diesel takes 30 to 40 sec to start every time cold or hot

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: g500 2005

Hi there, On this electronically controlled transmission, the problem may be mechanical or electrical. If the technician at the dealership found damaged wires along the harness, it should be replaced to prevent other circuits from shorting out. You may be...

Q: 2004 Saturn Vue...Right Front brake hanging up, replaced caliper and master cylinder and still hanging up.

High brake effort can be caused by a restriction in the system. What can happen with the brake system is the brake hoses attached to caliper degrade internally causing a restriction. The hose will collapse under pressure.

Q: Jeep is having a hard time starting. 2004 Jeep Grand Cherokee

Hi there - your symptoms suggest a fuel supply issue, quite likely a fuel pressure check valve or fuel pressure regulator issue. Either of these can allow fuel pressure in the injection system to leak down while the vehicle sits....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...