Skip the auto shop - Our mechanics make house calls

Q: My 2007 Grand Caravan hard detonation problem

asked by on

My car lacks power, misfires,, cannot drive over 40 mph because it starts to shake. So far replaced the ignition coil, sparks plugs, spark plug wires, crank shaft sensor and TPS. OBD II scanner detected cylinder misfire 1 and 3 (back) and 4 (front). Spark plug from 4th cylinder was burned. Put Cataclean and B-12 Chemtool on the tank. Runs smooth until you hit the accelerator.

My car has 180000 miles.
My car has an automatic transmission.

A: As you know, a misfire can be caused by man...

As you know, a misfire can be caused by many different reasons such as bad spark plugs, spark plug wires, faulty fuel injectors, lack of voltage to fuel injectors, incorrect fuel pressure, an air intake leak and many other possibilities.

The fact that spark plug #4 was burnt suggests that you may have a lean fuel condition which is usually a result of an intake air leak or potentially a bad fuel injector not supplying enough fuel to that cylinder causing it to lean out and burn the plug. This would also explain the shaking and lack of power due to the motor starving for fuel. I would recommend having an expert from YourMechanic come to your location to diagnose the misfiring problem so that this can be corrected.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: 1993 suzuki sidekick jlx transmisión is kicking

Hello. A jerking or kicking transmission can be caused by many things. The first thing I would do is check to make sure that the transmission fluid is at the correct level, and not excessively dirty or contaminated. If the...

Q: Fuel line or spark plugs at fault. Car won't start, even with a jump.

Get this problem inspected by a mechanic. The most likely failure will be the fuel pump and filter. I would recommend you have a certified technician check for fuel pressure and replace the fuel pump and filter. If the fuel...

Q: Check engine light on - persistent misfire 2008 Honda fit

Hello - the P0304 indicates, as you state, a persistent misfire on cylinder 4. This could be due to a bad plug or coil on that cylinder, or a clogged or leaky fuel injector, causing the misfire. "Reading" the color...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...