Q: running rough, blowing blue smoke then white smoke

asked by on

My car is running extremely rough it blew blue smoke then white smoke also made a whining/grinding sound. The mechanic has given me several answers to what he thinks it is but nothing is adding up. One call he said a valve had dropped. Then another call was the oil gallery has failed and I need a new engine. He says he has tested the compression and they are all reading normal, so not a problem with the valve then, right? Would the oil gallery "failing" cause me to have to replace my whole engine?

My car has 100000 miles.
My car has an automatic transmission.

Testing and diagnosing will give a technician a good idea of what to expect will be found with internal engine problems, but you can never be totally sure until some disassembly and inspection has been done. Test results leading to an expectation of finding a blown head gasket can turn out to be a cracked head, or a failed piston.

Opening up an engine that has 100,000 miles on it is risky. You really need to do some hard evaluating on what the vehicle is worth and what it may actually end up costing to fix it right. Too many engines get disassembled and partially repaired, then put back together with many old parts that should have been replaced or reconditioned at a machine shop. Of course it usually due to trying to control costs, but it frequently results in a repaired engine that burns oil, is noisy, or performs poorly. These partially-rebuilt engines rarely last long enough to justify what was invested in the repair. Have it done right or don’t do it at all.

If you decide to get this fixed, consider enlisting a qualified mechanic who can perform the necessary checks to diagnose your rough running condition and the smoke you’re experiencing. Once this is done you’ll have a good idea of what will need to be fixed and from there you can proceed with the repairs that are necessary. Good Luck.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. running rough, blowing blue smoke then white smoke

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: Yea, I'm wondering how to stop my stock factory alarm from going off. I don't know what I moved that started my alarm to go off in the 1st place.

Hi there. Remove the battery cables and leave the cables off for about 13 minutes. This will clear the immobilizer and the ECM (computer) to a learning mode. Then hook up the battery cables. If the alarm is turned off,...

Q: The RPM is racing up and down when in park. Dashboard lights come on one at a time and then the car runs badly

Hi there. I understand your situation and concern. Fist we need the codes that are stored when the Check Engine Light comes on. Any diagnostic scan tool should be able to give us the codes that are set and give...

Q: Where is the thermostat location for a 2013 Chrysler 200 2.4L

Hello, the thermostat on this engine is located at the "rear" (driverside of the car) of the cylinder head. It is somewhat covered up by the valve and cam housings above it, and is fairly difficult to access. There is...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...