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

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: Stalling engine, brakes, power steering and transmission failure

The stalling may well be caused by a failure of the crankshaft position sensor. This device provides timing instructions for the ignition system. When it fails, the engine no longer gets spark at the spark plugs and stalls. When the...

Q: Timing chain broke, is my car not fixable now or do I have bent valves?

Unfortunately, your engine - as most engines today - is what is considered an interference engine. The timing belt/chain is responsible for keeping the internal engine parts moving in the correct time. Interference refers to the fact the intake and/or...

Q: my car is misfiring

The DME is a possible failure for the misfire for your 2002 BMW M3. A complete pinpoint test for the codes would need to be done to rule out anything like coils or plugs. Your shop replaced the plugs and...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...