Q: Flat spots and stuter at low speed and smelling petrol

asked by on February 09, 2017

What can be the problem it sometines with startup white smoke then stops if i rev the car up the flatspots dissapear

My car has 235709 miles.
My car has a manual transmission.

Hi there. White smoke is sometimes an indication of coolant finding it’s way into the oil inside the motor. This can be caused by a blown head gasket or shortly after experiencing an overheating issue. It can also be caused by an over rich fuel situation; in most cases due to a fault with the idle control valve, mass air flow sensor or other fuel system component.

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

How do you access the exhaust manifold behind the engine on a 2001 mazda mpv lx

Hi Robert. Thanks for the question. You are correct, gaining access to the rear exhaust manifold bolts can be tricky on this Mazda. I would recommend purchasing a service and repair manual for your Mazda, as it will provide you...

Driver door won't open from inside or outside.

Hello. If the door will not open, then the issue may be the latch, but it may also be the linkage that connects the handles to the latch. You will need to access the inside of the door panel to...

Tachometer and temp guage

Hello. Thanks for writing in about your 1994 Mazda 626. The fuse that powers the gauges are the meter fuse 15 amp. It is located in the joint box. If this doesn't fix the issue, consider YourMechanic, as one of...

My fuel pump won't kick on it's works when we jump it from the relay in the ccrm but won't kick on

If the pump works when you power it directly, that is when you bypass the vehicle wiring, that's good. All you have to do then is troubleshoot the vehicle wiring (relay, fuses, and so forth). The fastest way to do...

Does the PCM in my 2000 Chrysler Cirrus have to be reprogrammed after replacement?

The repair information from Chrysler says an OEM level scan tool must be used to update the mileage and VIN number in the replacement PCM. If this is not done, a diagnostic trouble code (DTC) will be set. You'll want...

Car stalls while driving. It will start up after about 10 minutes.

Hi There, What you are describing sounds like an ignition coil pack that may be failing. Ignition coils are prone to this type of erratic functioning or heat cycling when they are beginning to fail due to the temperature fluctuations...

Won't start and has spark, 49 psi in fuel pressure, and it ran when I parked the car. Why won't it start?

Hi there. Check the starter and see if is clicking when you turn the key. If the starter is clicking, then either the starter relay or the starter solenoid is not working. If there is no click and the starter...

88 mazda mx6 gt crank no start

Be sure the fuel is not old. Old gas will not start or run an engine. Initially, check the throttle position sensor. If that checks out, carefully check engine compression in each cylinder. If there is no, or inadequate, compression...

How would I know if it was my upper or lower oxygen sensor that has gone out?

Typically if an oxygen sensor is bad, the check engine light would come on and a fault code stored in the engine control unit. There are other ways a technician can verify if oxygen sensors are performing as they should....

Related articles

A Buyer’s Guide to the 2011 Mazda Tribute
2011 2011 marked the final year of production for the Mazda Tribute, a compact SUV that shared a platform with certain Ford models. The Tribute managed to combine relative affordability with decent performance and a modicum of comfort while driving...
A Buyer’s Guide to the 2011 Mazda RX-8
The The 2011 Mazda RX-8 is a sporty, two-door coupe that is able to seat four people (two in the front and two in the rear). While this was the final year of production for the RX-8, it definitely made...
2012 Mazda CX-5 vs. 2012 Toyota RAV4: Which One Should I Buy?
Mid-size crossover SUVs are an excellent option when you need to take several friends along with you, or bring your kids along and yet still need to keep a tight leash on your purchase cost as well as your ongoing...