Skip the auto shop - Our mechanics make house calls

Q: Car shakes and pulls when driving

asked by on

The S&M and D lights are flashing and stalling. The car hesitates to turn on at times, and when running it shakes/pulls, but that goes away.

A: Hi. The lights you are mentioning have been...

Hi. The lights you are mentioning have been caused by loose or corroded battery terminals. The symptoms you are experiencing sound like an engine component position sensor. The engine's computer relies on the values from the crankshaft and camshaft position sensors for accurate fueling and ignition. Have an experienced technician drive the vehicle with an appropriate scanner and observe battery voltage and the signals from these sensors. The mechanic can also inspect for electrical components that are failing and inspect the starting problem with more precision.

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・Save up to 30%

Get a quote

What others are asking

Q: idles rough after heavy acceleration, going up hill, getting off freeway, weak warm start ups

The most common cause of this is either a charging system issue, such as the alternator or battery, or low fuel pressure from a clogged line or failing fuel pump. Either the charging system or the fuel system can have...

Q: Shaky car/steering wheel

It would depend on what the quote stated as the problem. I do not like taking risks with anyone's brakes. For most brakes you would need quality brake pads (avoid cheap ones), brake rotors for both sides, brake caliper slide...

Q: valves

I think you are asking if a valve in a head will seal out all of the fluids and air? The answer is yes it should. A leaking valve will not hold compression if this was the case. The valve...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.