Q: My car will crank but won't start. It gets fuel and I just replaced the coil pack - what could be the problem?

asked by on

I thought it wasnt getting fuel so i replaced the fuel injecter but it wasnt the problem so i replaced the coil pack but wasnt the problem what could it be?

My car has 215000 miles.
My car has an automatic transmission.

With a crank no start condition, you need to first determine what your motor is missing. Spark, fuel pressure, injector pulse or cam timing. This is best done with a fuel pressure gauge, a noid light to check for injector pulse, a spark tester to check for spark and a compression gauge to check for proper camshaft timing. I connect everything except the compression gauge first. If I find something missing, I follow that diagnostic path. If everything is present and of course the motor won’t start, I begin checking compression.

If camshaft timing is off, compression will be way off in more than a few cylinders. Lets hope it is not camshaft timing on your vehicle because this is a major problem on your vehicle that may cost more money to fix than the value of the car.

If you are missing spark and injector pulse, suspect a bad crank sensor. The best way to observe the crank sensor is working is with a scan tool. If you are missing only injector pulse, test for power at the injectors with the key on. The PCM grounds the injectors to turn them on. If this isn’t happening and you have spark, suspect the PCM. But keep in mind, PCM’s are not in the habit of failing, so suspect there is something else causing the PCM not to fire the injectors. Security system, etc.

If you are missing only spark, this has to do with the ignition system only. If you don’t have fuel pressure, begin testing the fuel pump at the fuel pump relay. This means remove the fuel pump relay and supply power to the fuel pump to see if it runs. This will require a wiring diagram and some knowledge of these systems.

If all this is too daunting, I recommend a car is not starting inspection.

Good luck!

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. My car will crank but won't start. It gets fuel and I just replaced the coil pack - what could be the problem?

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: When turning the temp. selector from cold all the way to hot, does it click?

The a/c system has temperature blend door actuators that control the temperature door of the a/c heat system. The clicking is caused when the internal gears of the temperature blend door actuator cannot move the door inside the evaporator case...

Q: Service tire monitor system light appears. Is it ok to continue to drive

As long as the tire pressure is not, in fact, low it is safe to drive. So, just check the actual tire pressure in all 4 tires. Using a tire pressure gauge, if you do find low pressure in one...

Q: Car is lurching at 10 mph after changing the rear differential.

Hi there. The symptoms that you are experiencing is that the gear ratios from the front axle and the rear axle are different and causing the vehicle to lurch at low speeds. Take the vehicle off road on a dirt...

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...
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...
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...