'90 ZR-1 Intermittent Power problems - ZR-1 Net Registry Forums

DarkAngel · 07-22-2021

Hi everyone,

I need your help because i encounter a pbl with my '90 Z

The car start and run well until a certain moment when she start to have some power issue : she will stutter and stumble intermittently and when at idle she seems to vibrate and have some knock issue also

Recently i had to open the plenum and replace the Sensor Coolant Temperature
because the car didn't run at all (really hard to start, car was shaking, couldn't hold idle and impossible to drive)
I've also replaced the fuel pump with P240KC as suggested by Jerry's doc

Since i replace the coolant temperature, car runs well except the intermittent power issue

I've read on some other posts that it might be the injector resistance that fails on one or more injector

As the injector was already replaced when i got the car and i drove only around 15000 miles since the replacement, i'm surprised that it might be the injectors

Could it be something else like the spark plugs ?
In case, it's the injector, does the "magical" product that supposed to clean the injector could be any good ?

I've read the procedure to test the injector resistance but i didn't get exactly how to proceed as there is no pictures

Also if one is failing, do i need to replace them all ?

07-22-2021	#1
DarkAngel Join Date: May 2013 Location: France Posts: 55	'90 ZR-1 Intermittent Power problems Hi everyone, I need your help because i encounter a pbl with my '90 Z The car start and run well until a certain moment when she start to have some power issue : she will stutter and stumble intermittently and when at idle she seems to vibrate and have some knock issue also Recently i had to open the plenum and replace the Sensor Coolant Temperature because the car didn't run at all (really hard to start, car was shaking, couldn't hold idle and impossible to drive) I've also replaced the fuel pump with P240KC as suggested by Jerry's doc Since i replace the coolant temperature, car runs well except the intermittent power issue I've read on some other posts that it might be the injector resistance that fails on one or more injector As the injector was already replaced when i got the car and i drove only around 15000 miles since the replacement, i'm surprised that it might be the injectors Could it be something else like the spark plugs ? In case, it's the injector, does the "magical" product that supposed to clean the injector could be any good ? I've read the procedure to test the injector resistance but i didn't get exactly how to proceed as there is no pictures Also if one is failing, do i need to replace them all ?