Skip the auto shop - Our mechanics make house calls

Q: What is causing my engine misfire?

asked by on

my 1995 mercedes c180 developed a missfire i have changed the spark plugs it is still the same. a mate who is a qualified mec said it could be a burnt out valve but did a pressure test and every thing came back ok. he said it was the coilpack he replaced it and the problem still there. with the old coilpack he said it was missfireing on no4 plug with the new pack he said it is doing it on no3. so i have ordered another one . is he missing something????? any help wpold be appreciated

My car has a manual transmission.

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: Hard Start

Illustrative causes of hard starting include a faulty engine coolant temperature switch (sensor), worn spark plugs and/or defective secondary wires and coils, inadequate fuel delivery or pressure (e.g., clogged fuel filter), dirty fuel injectors (fuel injectors cannot be completely cleaned...

Q: Can you give me an estimate? 1997 Mercedes SL600

Hello - this sounds like serious engine repair which, unfortunately, is beyond the services YourMechanic currently offers. In general, an engine replacement with a warranted used or rebuilt engine can be less expensive than the repair cost for the situation...

Q: Need to possibly replace a thermostat.

It is possible that you have a stuck closed thermostat. I would make sure there is coolant in the radiator first. You may need to take the upper radiator hose and poor some coolant into the hose and see if...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...