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Z51JEFF · 04-01-2017

Congratulations! The vacuum pump will cycle for a few seconds and then shut off and cycle again after a short time,just how long varies. The switch for the fan should be eliminated and everything returned to stock,this was a popular addition but never seen it on a Z. The amps in the speakers die in pretty much all of these cars as well as the CDM controller for the stereo. To check to see if the vacuum pump is working unplug the pump and turn the key to on,not started and the pump will run. Locate the pump,follow the hard line up to the ALTERNATOR and there should be a coupling that will allow you to separate the 2 lines. The vacuum pump is down in the right side headlight well bolted to the frame. Not sure on a 90 but my 91 the line for the pump is routed like this. Welcome to the madness.

04-01-2017	#23
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,093	Re: WTB advice please!! Congratulations! The vacuum pump will cycle for a few seconds and then shut off and cycle again after a short time,just how long varies. The switch for the fan should be eliminated and everything returned to stock,this was a popular addition but never seen it on a Z. The amps in the speakers die in pretty much all of these cars as well as the CDM controller for the stereo. To check to see if the vacuum pump is working unplug the pump and turn the key to on,not started and the pump will run. Locate the pump,follow the hard line up to the ALTERNATOR and there should be a coupling that will allow you to separate the 2 lines. The vacuum pump is down in the right side headlight well bolted to the frame. Not sure on a 90 but my 91 the line for the pump is routed like this. Welcome to the madness.