Q: Rich run, bad start, sometimes white smoke

asked by on

Hi, i have deleted DPF and EGR (EGR blank plated and disabled by ecu) after all this problems came. engine rebuild for excessive oil consumption. Car starts bad, sometime smokes white not huge. small black smoke every acceleration. transmission jerking during up and down shift from 1-2-3 and 3-2-1. what can be the reason of problem.

when the car diaqnosed by star diagnostic tool it showed that everything is ok but MASS Air Flow sensor is calculating less air. no error code.

My car has 150000 miles.
My car has an automatic transmission.

The white smoke is a bit worrisome - usually an indicator of a blown headgasket, which will also cause rough running, especially at low speeds from a compression imbalance. The throttle position sensor may also be sending "off" signals to engine management, resulting in a bit of a rich mix, and harsher shifting.

To avoid any unnecessary repairs, I would recommend having a certified technician, like one from YourMechanic, diagnose your shaking/vibrating condition to confirm there is a problem, get an accurate assessment of damage and cost estimate for repairs. YourMechanic can dispatch a mobile, professional mechanic to your location for this repair.

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. Rich run, bad start, sometimes 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: Lots of squealing from engine. I have been told idle pulley bad. Mechanic out of town. Should I drive car? Land Rover LR3

It would be recommended not to drive the vehicle until it is looked at by a certified mechanic. If the [idler pulley])(https://www.yourmechanic.com/services/idler-pulley-replacement) were to fail, the drive belt would be unable to spin the water pump and cause an overheating...

Q: Car only drives in first gear

Sounds like you might be having an issue with your shifter mechanism. If the shifter is not fully in park, they key usually wont come out of the lock cylinder. Depending on the location of the shifter you many have...

Q: P065A - Generator System Performance

Hello, thank you for writing in. To start, the generator is the alternator. It generates the power supply for the vehicle based off the vehicle's engine performance. There are several ways to approach the repair. You may remove the starter...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...