How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Pete Your Own Question
Pete, Technician
Category: Car
Satisfied Customers: 27814
Experience:  17 years automotive training and experience.
Type Your Car Question Here...
Pete is online now
A new question is answered every 9 seconds

Tested my injectors using a noir light and #4 is constant

Customer Question

Tested my injectors using a noir light and #4 is constant and dim, #6 is constant and very bright. What might cause this problem ?
Submitted: 6 months ago via ChiltonDIY.
Category: Car
Expert:  Pete replied 6 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

This is a short in either the injector wiring harness or the computer needing replaced.One other issue is if one of the injectors is shorted internally it can back feed and cause this here.Try unplugging each injector one at a time and see if the constant signals go away.If they do when one is unplugged then the affected injector needs replaced.If they do not then the fault is in the wiring harness or engine computer.Trace the harness looking for any shorts or damage needing repaired or replaced.If the harness looks o.k. then the engine computer needs replaced.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete