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#11 |
![]() Join Date: Jan 2021
Location: Beautiful Bavaria
Posts: 523
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You could measure the resistance of all injectors as a valuable indication of their condition. There's a guide on Marc's page. Engine should be hot and stopped for about half an hour to ensure maximum heat soak in injector area.
Injectors can stay in place and only a few plugs have to be unplugged if you follow the instructions. This is money well spent as faulty injectors can cause severe damage, e.g. damaged catalysts.
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ZR-1 #638/1991 |
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#12 | |
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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So just so I have an updated running list: Oil Change - Driven HR4 10w30 and Wix filter Trans Fluid - Castrol Supercar 10w60 Diff Fluid - Valvoline 75w90 Synthetic + ACDelco limited slip additive Spark Plugs - ACDelco 41-602 gapped to 0.035" Air filter Fuel Filter Replace brake and master cylinder hydraulic fluid (syringe method) Clean PCV and throttle body Check brakes Replace fuel injectors (16) - Intake Plenum Gaskets and feed & return block orings Serpentine Belt Cam cover vent filter Last edited by fastpace; 04-19-2022 at 09:37 AM. |
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#13 |
![]() Join Date: Nov 2021
Location: Mokena, IL
Posts: 78
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Since you are already there, I would consider replacing the Fuel Pressure Regulator with the updated kind from Jerry's. When I did my injectors this winter, I got everything back together and then had the FPR fail spilling fuel out the TB/airbox. It required me to take everything back apart to replace it. Get Marc's video, have some spare vacuum hose and expect to break some clips.
I had a great time, even with the setbacks, being a new owner and working on my car. Enjoy all that time you get to put into it! Congrats on your new ride! https://www.jerrysgaskets.com/regula...re-90-95-14c3/ |
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#14 |
![]() Join Date: May 2021
Location: Freeburg IL
Posts: 45
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From my experience, add an idler pulley and an oil pressure sensor and switch. All have failed on me when I've taken zr-1s on their first long drive.
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#15 | |
![]() Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,575
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RARELY have I found them to be rust free after 25-30 years! If nothing else replace the sock, if all else good. Replace or at least inspect all 4 brake hoses. Stainless are suggested. FUEL INJECTORS!!! Make sure hood strut has not lost its oomph before you get bonked. Inspect rear hatch weather-strip especially in front corners, replace if torn. Find someone with any of the aftermarket shifters and try it. Act accordingly. As suggested earlier, new battery and add permanent battery tender connections and tender. Avoids many odd gremlins. Add ZR-1 Net Registry decal. Add Fuzzy Dice! Drive; Enjoy, Repeat. ![]() Marty |
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#16 | |
![]() Join Date: Apr 2022
Location: NorCal
Posts: 14
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#17 |
Join Date: Dec 2007
Location: Fremont,Ca
Posts: 3,057
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Can't forget the secondary starter relay modification. From what I understand the wiring setup in 90-92 was a faulty design and allows to car to not start from time to time. My 91 did this a few times,did the mod and no more -DREADED NO START SYNDROME- On the other Forum there's a STICKY at the top of the ZR-1 page of this mod. Some have argued I've got the wiring not absolutely correct but it works for me.
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