1990 zr1 help continued... - ZR-1 Net Registry Forums

Chris26 · 06-08-2016

Does the ICM control spark and the injectors or both???

XfireZ51 · 06-08-2016

Quote:

Originally Posted by Chris26

Does the ICM control spark and the injectors or both???

The ECM controls spark timing, the ICM CONTROLS START-up, limp home mode,
And firing of ignition coils. Injectors are controlled by ECM.

Chris26 · 06-08-2016

Thank you!!!...I might have a fried ICM (under the plenum)...seems that mice got into the valley at one point and caused a small fire!!! The engine did start before but not anymore.

Paul Workman · 06-09-2016

Quote:

Originally Posted by Chris26

Thank you!!!...I might have a fried ICM (under the plenum)...seems that mice got into the valley at one point and caused a small fire!!! The engine did start before but not anymore.

Oh, that ain't good, for sure! But, don't jump to conclusions until you have the harness repaired...speaking from experience w/ burnt harnesses. There are fuses and fusible links scattered about that may have done their job.

I'd concentrate on the harness - getting that back in shape, scanning it for codes, and go from there. I'd say (hope) your chances are better than 50-50 that the modules will be OK (they ARE very robust!)

Chris26 · 06-09-2016

Thanks for the reply!!! The harness is not that bad just a little seared..
Someone at one time installed an extra hot lead that connected directly from the battery to the alternator...they ran it under the plenum...Seems that a mouse chewed on it and created a ground through the block...with all the dirt and debris
igniting a small fireball. The secondary port actuators have the vacuum lines melted...

06-08-2016	#1
Chris26 Join Date: Jun 2016 Location: Canada Posts: 53	1990 zr1 help continued... Does the ICM control spark and the injectors or both???

06-08-2016	#3
Chris26 Join Date: Jun 2016 Location: Canada Posts: 53	Re: 1990 zr1 help continued... Thank you!!!...I might have a fried ICM (under the plenum)...seems that mice got into the valley at one point and caused a small fire!!! The engine did start before but not anymore.

06-09-2016	#5
Chris26 Join Date: Jun 2016 Location: Canada Posts: 53	Re: 1990 zr1 help continued... Thanks for the reply!!! The harness is not that bad just a little seared.. Someone at one time installed an extra hot lead that connected directly from the battery to the alternator...they ran it under the plenum...Seems that a mouse chewed on it and created a ground through the block...with all the dirt and debris igniting a small fireball. The secondary port actuators have the vacuum lines melted...