Q: No injector pulse but does spark.

asked by on

After replacing the transmission on my truck I found out it was cranking and would not start. I put a test light and no pulse from either injectors. I also checked and there was spark. So far I know my ecm is good. Im thinking it is my crank sensor or my pick up coil but im not sure if my truck would spark if those two things were bad. Please, I need help. Thank you.

My car has 100000 miles.
My car has an automatic transmission.

Hello There, You are correct in that if the crankshaft position sensor or the pickup coil were bad there would likely not be any spark to the plugs. In relation to your no injector pulse problem, check the wiring harness from the distributor to the ECM. If that harness has become disconnected somehow, the ECM will not have a pulse reference from the distributor in order to fire the injectors. Also, make sure that you actually have power to the injectors, as there are 2 fuses that supply them. Make sure these are not blown. If there are connectivity problems, sometimes these will draw too much current and cause them to blow. If you need additional assistance, I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your injection system.

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. No injector pulse but does spark.

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: Power steering pump pulley

The shaft size and hole size will only be about .003" difference. The shaft if it measures .748" then the pulley hole will be about .745". This way the pulley will press on and be tight. If you need help...

Q: Q: Battery light

Hello, thank you for writing in. The charging system is controlled by the PCM (powertrain control module). The module receives input information to keep the electrical system operating, if the voltage goes below 9.0 volts the light will come on...

Q: Getting fuel, getting spark, and won't start.

Check the ignition timing on the distributor and see if the timing is off. If the timing is good, then the accelerator pump in the carburetor or the fuel injectors are not working properly (if your vehicle has TBI injection)....

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...
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...