Skip the auto shop - Our mechanics make house calls

Q: Not getting pulse at injectors 1 and 4.

asked by on

Car is running rough, learned that injectors 1 and 4 are not pulsing. I've replaced the ignition pickup coil, ignition control module, plugs, wires, cap and rotor. All grounds have been cleaned up. Verified getting spark at all plugs, and the firing order is correct. I've also tried two ignition control modules. I have no idea what else to check, other than maybe the injector harness?
My car has a manual transmission.

On this vehicle injectors #1 and #3 are pulsed together and injectors #2 and #4 are pulsed together from the computer. If injectors #1 and #4 are not working th. en you will need to disconnect the injector connector to check the injector signal with a noid light to make sure you are getting computer pulse. If you do then replace the injector and retest the engine for running. If you have good injector pulse and listen to injector to see if it is working. If it is then double check the spark plug wires for #1 and #4 to see if they are crossed. If okay then you will need to have the cylinders compression checked for internal engine problems. If still problem is not identified then seek additional diagnostics from a mechanic like one from

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Van running too rich

There is a common issue with the fuel injectors on your particular vehicle where it will dump too much fuel in the engine. A trained technician could easily diagnose the issue as to why it is running rich, perform necessary...

Q: What is the smell ?

Hello. You should take it back to the person that did the work to see if what they did is leaking or it is just residue from the leaking gasket you had. Give the shop a chance to correct the...

Q: Car runs high in drive but not in a low gear.

Hi there. I'm not quite clear as to what you're referring to in regards to running HIGH. If you mean that the vehicle will accelerate slow in low gear, but runs fine once you shift into higher gears, the issue...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...