Differences in knock sensors? - ZR-1 Net Registry Forums

Paul Workman · 08-01-2010

The knock sensor is a piezoelectric crystal with a pickup wire. But, apparently, the associated "plumbing" includes a resistor network that differs among the model years. According to Bob G, a sensor from another MY resulted in considerable timing retarding on one of his engines (the ECM falsely sensing knock, apparently).

Mine works, far as I know, but the plastic ring to which the connector "grabs hold" got brittle with age/heat and part of the ring broke off - now making the connection precarious at best!

So, Q: Has anyone found a reasonable facsimile, if not an OEM, knock sensor that works on a 90? Granted, the connector may have to be changed to accommodate one from a different source/application, but this car is an FBI "warrior" and not a waxer; NCRS is not an issue here.

TIA

P.

A26B · 08-01-2010

I didn't know there was a difference in the knock sensors until I went to the ACDelco site: Lo & behold, the 90 is a different PN.

1990

SENSOR,KNOCK
Part Number: 213-94
Product Notes:
[Knock Sensor]
Per Vehicle: 1; Years: 1990-1990

CONNECTOR,SEN-KNOCK
Part Number: PT2295
Product Notes:
[All Makes-Sensor-Knock Connector]; 1-Way male
Per Vehicle: 1; Years: 1990-1995

------------------------------------------------------

1991~95

SENSOR ASM-KNOCK
Part Number: 213-266
Product Notes:
[Knock Sensor(VPI 1-877-846-8243)]
Per Vehicle: 1; Years: 1991-1995

Vehicle List

CONNECTOR,SEN-KNOCK
Part Number: PT2295
Product Notes:
[All Makes-Sensor-Knock Connector]; 1-Way male
Per Vehicle: 1; Years: 1990-1995

08-01-2010	#1
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Differences in knock sensors? The knock sensor is a piezoelectric crystal with a pickup wire. But, apparently, the associated "plumbing" includes a resistor network that differs among the model years. According to Bob G, a sensor from another MY resulted in considerable timing retarding on one of his engines (the ECM falsely sensing knock, apparently). Mine works, far as I know, but the plastic ring to which the connector "grabs hold" got brittle with age/heat and part of the ring broke off - now making the connection precarious at best! So, Q: Has anyone found a reasonable facsimile, if not an OEM, knock sensor that works on a 90? Granted, the connector may have to be changed to accommodate one from a different source/application, but this car is an FBI "warrior" and not a waxer; NCRS is not an issue here. TIA P.

08-01-2010	#2
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,400	Re: Differences in knock sensors? I didn't know there was a difference in the knock sensors until I went to the ACDelco site: Lo & behold, the 90 is a different PN. 1990 SENSOR,KNOCK Part Number: 213-94 Product Notes: [Knock Sensor] Per Vehicle: 1; Years: 1990-1990 CONNECTOR,SEN-KNOCK Part Number: PT2295 Product Notes: [All Makes-Sensor-Knock Connector]; 1-Way male Per Vehicle: 1; Years: 1990-1995 ------------------------------------------------------ 1991~95 SENSOR ASM-KNOCK Part Number: 213-266 Product Notes: [Knock Sensor(VPI 1-877-846-8243)] Per Vehicle: 1; Years: 1991-1995 Vehicle List CONNECTOR,SEN-KNOCK Part Number: PT2295 Product Notes: [All Makes-Sensor-Knock Connector]; 1-Way male Per Vehicle: 1; Years: 1990-1995 __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.