Skip the auto shop - Our mechanics make house calls

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.

A: Testing and diagnosing will give a technici...

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?

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: Intermittent starting problem on my 2008 Chrysler 300C Hemi.

Hi There, What you are describing sounds like potentially a faulty starter relay or a bad ignition switch. The starter relay directs power from the battery to the starter solenoid which then engages the starter when you turn the key....

Q: Car runs rough, turns itself off & shakes

Hi! How very frustrating to spend money to have your vehicle repaired and then it's still not fixed! Fortunately you have some warranty on those repairs and can return to the BMW dealership and express your dissatisfaction with their inability...

Q: Car all of a sudden won't reverse .. 2005 Chrysler Sebring

Hello - first task is to check the fluid level in the transmission. If it is low, failure to engage gears could result. If you have lost Reverse only, most likely the reverse primary clutch in the transmission, or the...

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...
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...
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...