Skip the auto shop - Our mechanics make house calls

Q: my engine cranks but does not start

asked by on

hi. ive got a mercedes E300 TD from 1999 and the issue is that the engine just turns and turns but does not start, i think it might be the fuel pump but im not sure, its been two months since the car drove last time.

My car has 343750 miles.
My car has an automatic transmission.

While it is natural to suspect a fuel pump right away when a car does not start, there is a good chance other issues could also be going on here. Diesel engines, like the one in your Mercedes, need two things to start up. The first is proper compression, the second is the correct amount of fuel being injected into the combustion chamber at the right time. If your engine has good compression, (meaning the vehicle is not losing compression in the cylinder head due to bad piston rings, bent valves, or a blown head gasket), then we can begin to suspect that a lack of fuel, a weak battery, or failing glow plugs are behind why your Mercedes Diesel engine is not starting.

However, to really know if your vehicle has good compression, it is highly recommend to enlist the assistance of a certified technician to stop by and go over your Mercedes with you in person. They will have the experience and tools needed to accurately check both the charging system and the fuel pressure and determine why your Mercedes is not starting. From there, they can let you know exactly what repairs are needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: My BMW x5disel 2009, 20 minAfter I start car and drive car stop when car cool down started again

Hi there. It's quite possible that both are faulty or an electrical connection to the fuel pump is the source of your problem. The only thing we could recommend is have a professional mobile mechanic come to your location and...

Q: Front coil spring housing corroded and broke away

Hey there, thanks for writing in about your 1997 Mercedes-Benz E300. This is also related to your other question regarding the coil springs. As explained, the perch is a structure that supports the coil springs. Often times, when one or...

Q: How thermostat stuck open influences AC

Yes, because the computers control everything, and if the temperature isn't right, it can often make the AC not work right. What you will also find is that the system has electric cooling fans. If the car has a...

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 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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.