WhalePirot
Well-known member
Here's what I have learned while troubleshooting a Code 43. Understand, my '84 is not stock but runs a '90 speed density ECM from a Camaro thru the SuperRam, while emulating an '87, visually.
the 1990 Corvette and one adjacent year runs SD; other C4s are MAF.
Removed from the car, I used my DVOM to check for millivolts of output, measured between the case and the pin; polarity is not important. When I tapped the KS with a socket extension, the desired millivolts momentarily appeared on the digital display; the quicker I tapped the higher the voltages.
Courtesy of Jim at Jim's Performance in Ellicott City, VA (he redid my harness and sold me the sensors and ECM for the engine swap): I asked how to tell if this sensor was the right one; being new and seemingly ok. For an SD system, the resistance between the pin and the case needs to be 4k, not 101k, which is what this near-new one indicated. Perhaps this one's okay for an '84 TBI, but there is no PN on it; just the number '2'; hardly helpful to research what it is.
I hope this helps some of y'all.
the 1990 Corvette and one adjacent year runs SD; other C4s are MAF.
Removed from the car, I used my DVOM to check for millivolts of output, measured between the case and the pin; polarity is not important. When I tapped the KS with a socket extension, the desired millivolts momentarily appeared on the digital display; the quicker I tapped the higher the voltages.
Courtesy of Jim at Jim's Performance in Ellicott City, VA (he redid my harness and sold me the sensors and ECM for the engine swap): I asked how to tell if this sensor was the right one; being new and seemingly ok. For an SD system, the resistance between the pin and the case needs to be 4k, not 101k, which is what this near-new one indicated. Perhaps this one's okay for an '84 TBI, but there is no PN on it; just the number '2'; hardly helpful to research what it is.
I hope this helps some of y'all.
