Skip the auto shop - Our mechanics make house calls

Q: Car loses power, cannot start. 2002 Mercedes-Benz CL500

asked by on

Several months ago, I was driving the car and it started losing power. After I got home, I wasn't able to restart the car. The AA had the diagnostics run. There was a misfiring of the first and second cylinders. So, I had the coil pack replaced. However, the car continued to run the same way as if it had no fuel. I consulted a Mercedes pro. He told me that the car runs that way because the fuel pump doesn't give enough pressure. I had the fuel pump replaced. Now, the car has been sitting for a longer while and I cannot start it or jump it. What might be the cause of this?

A: Hello there, misfires are a common fault on...

Hello there, misfires are a common fault on cars as they get older such as the 2002 Mercedes CL500. Many different faults can cause the misfires such as the spark plugs, coil packs, fuel injectors, fuel pump, MAF sensor, oxygen sensors, vacuum leaks, crankshaft or camshaft sensors. With the vehicle not starting at all, the fault is slightly harder to diagnose but still able to be done. Many of the faults listed above could eventually cause the vehicle to not start like yours is currently doing. The first thing I look at in any misfire and no start condition is the battery condition then check for fuel, air, and spark. These are the basics of what keeps the engine running properly and one of them will have a fault. A qualified technician, such as one from YourMechanic, will be able to diagnose the misfire condition and perform any repairs required.

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・Save up to 30%

Get a quote

What others are asking

Q: Hi, how can I dismantling the oil sump? do you have a picture or service manual of this car? Thanks!

Unfortunately, I will not be able to post a picture of this repair. The service manual recommends pulling the engine to perform the repair. YourMechanic does not do this kind of service on your vehicle. I suggest purchasing a service...

Q: Rough idling

Hi there. Most of the time, this is caused by a dirty throttle body. If there is build up in the throttle body bore, then the throttle plate will have trouble racing the correct location keeping the engine from maintaining...

Q: My car shakes while it idles but says there is an evap system leak?

An evap leak is the same thing as a vacuum leak. A vacuum leak will certainly cause the engine to run roughly. I would recommend having your vacuum levels checked with a vacuum gauge by a qualified professional to determine...

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.