ZR-1 Net Registry Forums - View Single Post - 89MY ZR-1 Dash Panel Harness

Tyler Townsley · 07-06-2012

There are some gotchs when you mix 90 production ZR-1 hardware and 89 pilot ecm dis and fuel pump ckts. The 89 ecm does not control both fuel pumps whereas the 90 does. On the 89 the primary pump is controled by an oil pressure switch. The 89 dis miodule is wired differently than the 90 and if you try to use a 90 dis module on an 89 you will toast the tach ckt. Ask me how I know it took me 2 1/2 years to know just what the differences were and it wasn't until I got the wiring diagrams for both and traced the ecm/dis wiring in my 88 vs my 90 that I finally put it all togeather and got mine starting. I then discovered the 88 start calibration was very lean which made it real hard to start until I changed the calibration and increased the start pulse time by 3 times.

You need to post just what you have in mind.

Tyler

07-06-2012	#7
Tyler Townsley Join Date: May 2005 Location: Nichols, FL Posts: 611	Re: 89MY ZR-1 Dash Panel Harness There are some gotchs when you mix 90 production ZR-1 hardware and 89 pilot ecm dis and fuel pump ckts. The 89 ecm does not control both fuel pumps whereas the 90 does. On the 89 the primary pump is controled by an oil pressure switch. The 89 dis miodule is wired differently than the 90 and if you try to use a 90 dis module on an 89 you will toast the tach ckt. Ask me how I know it took me 2 1/2 years to know just what the differences were and it wasn't until I got the wiring diagrams for both and traced the ecm/dis wiring in my 88 vs my 90 that I finally put it all togeather and got mine starting. I then discovered the 88 start calibration was very lean which made it real hard to start until I changed the calibration and increased the start pulse time by 3 times. You need to post just what you have in mind. Tyler Last edited by Tyler Townsley; 07-06-2012 at 10:32 PM.