Code 42 revisited - Page 2 - ZR-1 Net Registry Forums

G8nightman · 07-07-2020

its on the prom Mark piggyback dose not have anything to do with the knock circuit board

Ccmano · 07-10-2020

On a 90 (not sure about 91) the knock sensor logic is contained in a separate module Located on the passenger side panel below the coolant fill tank. It looks like this. It?s mounted on the outside with easy access.
I have three new ones for sale if you need one.
H

G8nightman · 07-10-2020

Quote:

Originally Posted by Ccmano

On a 90 (not sure about 91) the knock sensor logic is contained in a separate module Located on the passenger side panel below the coolant fill tank. It looks like this. It?s mounted on the outside with easy access.

I have three new ones for sale if you need one.

H

Yea that?s on a 90 only

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Subfixer · 07-17-2020

I took G8nightman's advice and replaced the MEM-CAL (Jerry has some). Talking to Mark H., I was educated that the Knock Sensor circuitry is part of the 91-95 MEM-CAL (its the little white circuit board and I think the 2 chips below it), replacing the separate unit the 90's use.
No SES for 4 days now, so I'm cautiously optimistic.

G8nightman · 07-17-2020

Cool glad it got resolved. I was going crazy with the same issue when I first got my 91 z.

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07-07-2020	#11
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,188	Re: Code 42 revisited its on the prom Mark piggyback dose not have anything to do with the knock circuit board __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"

07-10-2020	#12
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Code 42 revisited On a 90 (not sure about 91) the knock sensor logic is contained in a separate module Located on the passenger side panel below the coolant fill tank. It looks like this. It?s mounted on the outside with easy access. I have three new ones for sale if you need one. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

07-17-2020	#14
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 381	Re: Code 43 revisited I took G8nightman's advice and replaced the MEM-CAL (Jerry has some). Talking to Mark H., I was educated that the Knock Sensor circuitry is part of the 91-95 MEM-CAL (its the little white circuit board and I think the 2 chips below it), replacing the separate unit the 90's use. No SES for 4 days now, so I'm cautiously optimistic. __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2018 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige Last edited by Subfixer; 07-17-2020 at 05:50 PM.

07-17-2020	#15
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,188	Re: Code 43 revisited Cool glad it got resolved. I was going crazy with the same issue when I first got my 91 z. Sent from my iPhone using ZR-1 Net Registry __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"