How does a GM knock sensor work on a car?
How does a GM knock sensor work on a car?
How to Test a GM Knock Sensor. The knock sensor on your GM engine is designed to sense detonation in the engine that causes a knocking noise from an improper air/fuel/spark ratio. The sensor takes that information and sends it to the computer, which in turn retards the timing on the engine to fix the problem.
What causes a flashing check engine light on a GMC Sierra?
While a majority of the time, the flashing check engine light is going to be caused by a misfire related to your Sierra’s ignition system or fuel system (as stated above), there are other issues that can cause it. Your timing chain could have jumped .
Are there any problems with the GMC Sierra 1500?
GMC Sierra 1500 owners have reported 8 problems related to engine clicking and tapping noises (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Sierra 1500 based on all problems reported for the Sierra 1500.
Why does my GM engine make a knocking noise?
by Russell Wood. The knock sensor on your GM engine is designed to sense detonation in the engine that causes a knocking noise from an improper air/fuel/spark ratio. The sensor takes that information and sends it to the computer, which in turn retards the timing on the engine to fix the problem.
Are there any knock sensor problems on GM trucks?
Knock Sensor Problems on GM Vehicles. Knock sensor problems are common on 1999-2007 Chevy Silverado, Express Van, Tahoe and Suburban trucks. Of course, this means that the GMC Sierra and Yukon of the same years have the same issues.
What are the codes for the knock sensor?
Eventually this turns on the check engine light and sets the codes P0332 and P0327. Note that often either one or the other code will set. Regardless if one or both codes are set, not only should the two original knock sensors be replaced, but you should also replace the harness.
Why are there knock and Ping sensors on my car?
The reason for this is the sensor generates its own voltage and is case grounded. It’s a piezoelectric automotive sensor that produces a small voltage signal when it hears internal engine noise that we often call knock and ping. This is why the location of the two sensors is a problem.
Are there any aftermarket sensors for GM cars?
After doing the job a few times I’ve learned I can save by using the Dorman aftermarket harness. It works well and carries a reasonable price tag. However, I would recommend going with the delco sensors as I had problems with the cheaper ones being defective right out of the box. The job is time-consuming, but straightforward.
