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 Mike S. Your Own Question
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 7433
Experience:  ASE Certified Master Technician
20625509
Type Your Chevy Question Here...
Mike S. is online now
A new question is answered every 9 seconds

Chevrolet: have a 1990 chev p/u 5.7 new app 10.000 mi code

Customer Question

have a 1990 chev p/u 5.7 new app 10.000 mi code 43 comes on how do you test knock sensor and wher does the wire come from and does it have voltage on it and can esc sand same code
Submitted: 2 years ago.
Category: Chevy
Expert:  Mike S. replied 2 years ago.
To test if the knock sensor is working, hook up a timing light and watch the timing mark as you tap on the engine block near the knock sensor with something metal and see if the timing retards.
Expert:  Mike S. replied 2 years ago.
The knock sensor should be on the right side of the engine (passenger side) and under the exhaust manifold. I believe it's near cylinder 6.
Expert:  Mike S. replied 2 years ago.
You could also use a voltmeter.
Leave knock sensor harness connector connected. Using a voltmeter, backprobe knock sensor connector. Connect voltmeter between sensor terminal and ground. Set voltmeter to 2-volt AC scale.
Start and idle engine. Tap on engine block near sensor. A signal should be indicated on voltmeter. If no signal is indicated, replace knock sensor.
Customer: replied 2 years ago.
you did not anser the whole qustion where dose the wire come from
Expert:  Mike S. replied 2 years ago.
To the esc controller.
Expert:  Mike S. replied 2 years ago.
The ELECTRONIC SPARK CONTROL (ESC) MODULE is located on a bracket behind the distributor, mounted to firewall.