Q: Car is shaking and smoking out of the tail pipe. I have replaced the spark plugs, alternator, and gaskets. It won't go past 50 mph.

asked by on January 16, 2017

car is shaking smoking out of tail pipe have replaced spark plugs alternator gaskets wont go past 50 mph will be has major trouble cannot find the problem and its using so much oil

My car has an automatic transmission.

Hi there. Check the following conditions that the engine could consume engine oil.

  • Positive Crankcase Ventilation Valve (PCV) is plugged up forcing engine oil into the combustion chamber
  • Piston oil control rings are worn and leaving excessive engine oil in the combustion chamber
  • Valve guide seals are broken, cracked, or missing causing engine oil to puddle up on the valves making the engine either suck in the oil or spit it into the exhaust system

I recommend start with replacing the PCV Valve and see if the engine stops smoking and begins to run smoother. If the PCV Valve does not cure the situation, then I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your engine for oil consumption.

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

What others are asking

Coolant is leaking behind the motor against firewall, on the passenger side, but only when the engine gets hot, Ford explorer 2002

Hi Logan. Thanks for contacting us today. The leak is likely coming from either a coolant line or more likely, the heater core. To ensure you have the right repairs completed, you should have a professional mechanic complete an onsite...

02 Grand Vitara 2.5L idles fine, but won't accelerate. Timing chain, MAF, fuel pump, compression, spark, injector pulse OK

It is possible that the fuel filter was never replaced with the fuel pump replacement. This could mean that the fuel filter is clogged and only allowing enough fuel to pass through for idle. Once more fuel is required when...

2006 BMW X5 White Smoke From Exhaust

My guess is the valve stem seals are bad. This is a very common problem with BMW vehicles the same era as yours. As the seals age and harden, they allow oil to seep past the valves and into the...

Van shakes, makes knocking noise - 1993 GMC G2500

Hello. You will need to find out if your engine is misfiring due to an ignition part like plug wires, plugs, or distributor parts like a cap and rotor or the module. If all the tune-up maintenance is done to...

There is whirring noise and vibration coming from the front end of my car

Hello. It sounds like you have a bad front hub bearing. When the bearing fails, this will occur as the noise you are hearing is the bearings not having any grease on them. I typically start by getting the vehicle...

oil is entering through throttle body and smoking from exhaust after pcv valve

Hello there, a few different faults can cause oil to be burned and white smoke to be seen. The most common would be excessive blow by, an intake leak, failed PCV valve or valve stem seal. A qualified technician...

Gears grinding in truck.

This is a very common problem. There is a problem with the synchronizer for 3rd gear inside your transmission. The synchronizer helps the gears mesh properly when changing gears. When a synchronizer goes bad the gears cannot mesh correctly so...

I just bought a used 99 Honda Accord V-6 2-door and I noticed steam or smoke coming from under the hood, at a drive thru

Hello, thanks for writing in about your 1999 Honda Accord. From what you've described, I think your issue is fairly simple. You probably just need a new thermostat. However, to avoid any unnecessary repairs, I would recommend having one of...

EPC warning light is illuminated

Hi there. The EPC stands for Electronic Power Control. This light comes on when there is a problem with the engine. In some vehicles, the EPC limits the amount of throttle that can be used so that the engine is...

Related articles

How Does Oil Lubricate an Engine?
Oil is an essential fluid in your car engine. Motor oil lubricates engine parts and prevents car overheating. Changing oil helps extend engine life.
Symptoms of a Bad or Failing Oil Pressure Sensor
Common signs include the Oil Pressure Light coming on or blinking constantly despite oil levels being fine or the oil pressure gauge reading zero.
How to Avoid Muffler Repair
Mufflers break when debris builds in the undercarriage, the muffler rubs against driving surfaces, or there is smoke emitting from the engine.