Q: Electrical signal to the injectors randomly malfunction

asked by on August 15, 2016

When first starting my car, it will run well. However, after starting it will lose the signal to the injectors. This problem is intermittent and doesn’t happen all the time. I have checked many things from the injectors to the fuel pumps and everything looks good and seems to be working well. The problem is with the electrical signal to the injectors and they stop randomly. Why are they stopping and what can I do to fix this car?

Crankshaft Position Sensor Replacement $120.83 - $900.50 Get a Quote

Hello. The issue you are experiencing is likely an intermittent crank position sensor failure. The crank position sensor is largely responsible for the fuel injector pulse because the pulse is alternated when the sensor passes certain points on the crank. If the sensor stops communicating the fuel injector pulse will stop until communication resumes. I suggest that you have a technician test the crank position sensor with a multimeter or a scan tool. If it’s proven to be bad, replace the crankshaft position sensor as necessary.

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

What does the Airbag Readiness Light mean?
The Airbag Readiness Light gives you information about the function of the airbags in your vehicle. If something is wrong with the airbags, this light will indicate when there is a problem that needs to be addressed. Since airbags are...
Car shakes at 40 mph
The brake issue is most likely a separate issue from the tire balance issue. It's possible the brake linings are worn or the backing plate is contacting the rotor. These items can be inspected during the tire rotation (https://www.yourmechanic.com/services/rotate-tires). If...
Fuses keep blowing for the fuel pump
Hello, thanks for writing in about your Pontiac G5. From what you've described you have a fuel pump that is causing the short intermittently. The connection to the to the fuel pump should be also replaced along with the pump...
Lost all power to the car
Turning on one additional switch creating a loss of all power suggests you have a short somewhere in your system. The additional power draw that the extra fan is creating puts an additional load on voltage being supplied to other...
When I start my truck it's idling high and when I'm driving the rpm fluctuate up and down and the transmission doesn't want to
Hello. It sounds like you may have a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak). This engine is notorious for vacuum leaks from a bad intake manifold gasket (https://www.yourmechanic.com/services/intake-manifold-gaskets-replacement). This is very common. It can also be from the MAP sensor (https://www.yourmechanic.com/services/manifold-absolute-pressure-sensor-map-sensor-replacement) or a...
hi i have 2003 toyota corolla s. missing underhood emission label. i need buy CAT but need know it its ULEV, LEV, or TLEV?
In this situation, I would recommend calling your local Toyota dealership to see what information they can give you. It is possible that you can give them your VIN number and they will be able to tell you which type...
Crossed spark plug wires? 1997 Jeep Cherokee
Hello - "crossed spark plug wires (https://www.yourmechanic.com/article/how-to-check-spark-plug-wires-by-robert-tomashek)" means simply that your plug wires are not attached to the plugs and/or the distributor in the correct firing order. Your cylinders are numbered 1 to 6, front to rear on your engine....
Ticking sound on drivers side
Deficiencies of various types can cause lifter and valve train noise, including ticking noises. The bottom line is if the ticking noise did not exist at all prior to their work on the valve train, but occurred immediately at the...
2007 Ford Fusion Airbag Code B2290
If you are now getting U1900 after disconnecting the module then you may have damaged one of the pins or damaged the module when reconnecting it. You may have to replace module and have it programmed and then may still...

Related articles

Can a Bad Sensor Prevent a Car From Starting?
If your car isn't starting or has a hard time starting, a faulty sensor may be to blame. Car sensors monitor data to keep your car running smoothly.
Symptoms of a Bad or Failing Oil Pressure Sensor
Common signs include the Oil Pressure Light coming on or blinking constantly despite oil levels being fine or the oil pressure gauge reading zero.
How Long Does an Injector Control Pressure Sensor Last?
A A diesel engine is a very sensitive and complicated piece of machinery. Getting a diesel to crank will require a number of parts to work together. Among the most vital systems on a diesel engine is the fuel injection....