Q: The oil looks like sludge would that stop the car from starting

asked by on July 20, 2017

The car wont start ive tried to jump it it cranks but doesnt start

Car is not starting Inspection $94.99 - $114.99 Get a Quote

Although dirty or contaminated oil can cause problems (with variable valve timing mechanisms for instance), dirty oil generally won’t prevent a car from starting. "Bad" or old gasoline could prevent a car from starting though. If the engine cranks at adequate RPM, be sure there is adequate fuel in the fuel tank and that the fuel is not old. Download any OBD-II trouble codes that have been stored and examine those codes for diagnostic clues. Check for adequate fuel pressure, injector operation, and a spark at the spark plugs. Basically, if the starter motor is turning the engine over rapidly, at sufficient RPM, but the engine does not catch and run, that means that there is an ignition, fuel, air induction, or mechanical fault in the engine that will have to be repaired. Check for vacuum leaks, an air induction fault like a stuck idle air control valve or, considering fuel, check for a failed temperature sensor that must be working properly to signal the PCM to enrich the mixture on cold start. Other possible no start faults are low compression, defective spark plugs, a defective coil(s), a failed crankshaft or camshaft position sensor, a failed throttle position sensor, and a broken timing belt. Regardless of the underlying cause, if you request a no start diagnostic the responding certified mechanic will get the problem diagnosed and repaired for you promptly. Please let us know if you have further concerns or questions as we are always here to help you.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Problems with glove compartment.
Sometimes if too many items were stored in the glovebox before it was closed last something could be jammed in between the latch mechanism. It is also possible that the glovebox was locked and the lock was broken in the...
Battery drain won't let car start.
Sounds like you might be having several issues with your car. The car uses the battery initially to start, but once it is running the alternator provides the electricity the car needs to run. If the alternator stops charging, the...
Power steering fluid leaking in a 2002 Chevrolet Monte Carlo
The power steering system uses the fluid to help you hydraulically turn the vehicle. If the fluid leaks out, from say a torn hose, it has nothing to develop hydraulic pressure with. This causes the condition you are experiencing. If...
Airconditioning system off before start & warming up the engine before driving
I always recommend allowing the car to run until warm in cold or hot conditions. I wait for the engine to run until the idle hits the base idle speed (around 700-800 RPM) before driving it. This allows the oil...
When start out driving when accelerate does good to 2000 rpm and then when go to accelerate more it drops off and have to let off
Hello. From what you describe, it would appear that your vehicle is experiencing some sort of engine performance issues. Problems accelerating under load can be caused by many things. A few common causes are issues with the ignition, engine management,...
Vibration in the car - 2003 Dodge Neon
Hello. When issues get worse after a repair, always double check the work that was done. If you check that off right away, then you should look at why the engine is shaking so bad. This is typically due to...
My traction control and stabilizer control warning light is on what does it mean
Hi There, As you may know, the traction control light and oil change are unrelated issues. The traction control system monitors the steering and stability of the vehicle and engages when loss of traction has been detected. This is done...
My Nissan versa 2011 security indicator light flashing
The key is stuck due to a fault with the ignition switch lock cylinder or the steering column interlock is malfunctioning. To resolve this, you can request ignition switch/lock cylinder repair (https://www.yourmechanic.com/book/). Once the stuck key issue is resolved, if...

Related articles

How to Start a Car in Cold Weather
Battery, oil, and fuel problems can make a car difficult to start in cold weather. Find out how to prevent starting issues related to weather.
Symptoms of a Bad or Failing Timing Belt
Common signs include a ticking noise coming from the engine, an engine that won't turn over, engine misfires, and oil leaking in front of the motor.
The Most and Least Expensive Cars to Maintain
Luxury cars, such as BMWs, are the most expensive and Toyotas are the most cost efficient. Driving style also affects car maintenance costs.