If your car won’t start but you can verify the fuel pump is running than the next thing you can easily do is check your cars tachometer if you have one. A common problem with a no start engine is the crank sensor. This sensor monitors the revolutions of the crankshaft and reports to the cars computer when to fire the spark plugs. Obviously, if the sensor fails, you will lose engine spark.
Engine spark can be easily checked by removing a spark plug wire and lay the rubber insulator of the wire on a metal surface of the engine like an exhaust manifold bolt head. Have someone crank the engine and see if a spark shoots out of the end of the wire insulator and jump to the grounded bolt.
Don’t hold the wire in your hand when you do this or you will get a pretty sweet shock if you lean on the car.
If you see a blue spark or hear a snapping noise coming from the end of the wire, then you have a good spark, and the problem must be with the fuel delivery system.
Checking A Crank Sensor With A Tachometer
When you turn the key, and the engine starts to spin, you should see the tach needle bounce or move slightly. If it does not move, you could have a bad crank sensor. However, this test does not always work with all brands of cars and bad crank sensors in most cases will give a trouble code. This can also be seen with a diagnostic code of PO335 – PO339
Most auto parts stores will assist you by scanning your cars trouble code at no charge.
No spark can also be caused by a bad PCM, park/ natural switch at the transmission shifting linkage, bad ignition coil or ignition control modules.
Car Engine Cranks But Will Not Start
Most no start problems will not be caused by bad spark plugs, plug wires or gas delivery problems caused by plugged filters and such.
These types of problems always start with early warning signs like:
- Engine loss of power.
- Slow starting.
- Engine check light warnings.
If your engine was running fine with no hints of trouble, then you find it just will not restart, you will most likely find a problem not related to typical maintenance issues. This is where dishonest repair shops will try to sell you other repairs that are not needed to fix any start problem.
You may not have the ability or mechanical skill to make the repairs yourself, but it is good to know what you are up against when you take your car in for repairs to prevent unnecessary repair costs and find out when a dishonest mechanic is trying to take advantage of you.
We hope these simple tips have helped you locate a bad fuel pump and assist you with knowing what replacing a fuel pump entails. Or you may have found a no spark issue and need an ignition control module or a crank sensor. Either way, you now have a better understanding of what the problem is and will aid you in determining if you want to tackle the job yourself or send it to a garage.
You can also check Valley Auto Loans for other “How To” subjects. Visit Valley Auto Loan’s resource page or our information blogs for How-To topics like how to close a stuck car window.
Many of our tips, drivers can fix themselves and save on repair bills and the inconvenience of being broken down.
We can also show you how a simple budget can help you plan to have the money to pay bills or save up for a car down payment without causing your monthly bill to go unpaid. We can also show you how to get money to pay for a divorce or child custody case and get money for a lawyer retainer fee if needed?
Here are just some of the “how-to” tips you will find.
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