ZR-1 Maintenance Tips

General Maintenance

by Jim VanDorn

 

The most common call we receive by far is from a confused ZR1 owner. After years of reading everything from which thermostat to use, to what type of spark plug is best, the average owner is totally and completely confused...and for good reason. There are many varied opinions of what is best for our cars but that may depend greatly on how you use your ZR1.

 

After seven years plus, many ZR1's are finally accruing some mileage. We have had the opportunity to closely inspect many engines with a variety of types of use from normal street driving to severe "weekend" use (track time). Compiling this information we can now offer the ZR1 owner some observations. One rule we've adopted after hearing so many owners say the same thing is the "DIMWIT" or "Darn, if I didn't Mess With IT" rule. In other words, if you didn't have a problem, then what are your intentions in the first place? To date, the only company known to have a fleet of engineering ZR1's to test with was GM and it's affiliates.

 

Therefore, we must ask ourselves if their suggested procedures and parts recommendations should have a considerable amount of merit. Obviously they do, but on the other hand, there are no doubt areas for improvement. Although we will begin our segment discussing the routine and normal maintenance of the ZR1, there are many areas where an upgrade will be suggested.

 

Please understand that these are personal opinions and experiences and are not intended to conflict with service procedures outlined in the appropriate service manual.


  Articles

Engine/Drivetrain

Air Duct Collapse Prevention
DIY information on preventing Air Duct collapse.

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Information on resolving backfire problems.

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How to tackle a broken bolt or nut.

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Removal and re-installation of the C-beam.

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Information on the chain tensioner rattles heard with the LT5.

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How to change the clutch master cylinder.

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Information regarding backwards installation of clutch actuator piston seal.

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Procedure: The following procedure may help to solve a "notchie" gear issue. As long as you haven't heard any gear clash (grinding) when ...

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Clutch Master Cylinder Installation
How to install a new clutch master cylinder.

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How to install the clutch slave cylinder on a 1990.

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Information on replacing the clutch/flywheel.

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How to defeat the 1-4 skip shift (CAGS)

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How to remove the LT5 engine.

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Information on the cause of Engine stumbles.

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Information regarding concerns with the stock flywheel.

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How to remove and replace the fuel pumps.

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Information on issues with the GM Clutch Hydraulic System Actuator.

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How to time the LT5 camshafts.

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How to remove the LT5 cylinder heads.

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LT5 Plenum Removal
How to remove the LT5 plenum.

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The most common form of preventive maintenance is the routine oil change. If you drive your car in hot weather, or under severe track conditions (high...

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Master Cylinder and Actuator Cylinder  Quality Issue
Symptoms: We have had a terrible time during the last few years dealing with the C4 MN6 CHS Master Cylinders (P/N 19158668) and Slave Cyl...

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Information on resolving "No Start" issues when the engine cranks.

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Information on resolving the "No Start"  issue when the engine won't crank.

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How to remove and install replacement oil cooler lines.

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Information on the various potential sources of oil leaks.

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Describes functioning of the oil pressure gauge and possible issues with low oil pressure.

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Oil Pressure Sender Reconditioning
Reconditioning the oil pressure sender

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Replacing the LT5 Oil Pump (1990-1992)

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How to remove the LT5 Plenum.

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Possible cause of rapid fuel pressure decay and long cranking.

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RF Injector information and part numbers.

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Thanks to Erle, Hib, Ed, James, and even Bruce, I've figured out how to read Diagnostic Trouble Codes on the 1994-95 MY ZR-1.   The 1994 servi...

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Reinforcing the Air Duct (Bellows)
How to make a reinforcement for the air duct (bellows).

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How to remove the primary injectors.

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How to repair (replace) the ZR-1 dual fuel pumps.

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Replacing the Throttle Body
How to remove and replace the throttle body.

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How to reset the engine oil life monitor

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LT5 Secondary Port Operation & Vacuum Diagnosis Before getting into diagnosing the LT5 engine's secondary port vacuum system, I thought it woul...

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How to install the serpentine belt.

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Describes the meaning of the Service Engine Soon (SES) light.

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How to test bad injectors.

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One of my members starting testing every thermostat that he removed during the course of servicing by testing the used one against a new thermostat in...

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How to replace the thermostat.

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Information on engine upgrades made between different years.

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Diagnosis and cure of vacuum leaks under the plenum.

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How to use the Vetronix/Mastertech scanners on 94/95 vehicles.

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Causes and possible cures for the "No Start" issue.

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