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#1 |
![]() Join Date: Aug 2019
Location: Montgomery, NY
Posts: 26
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Hello my Z brothers. Looking for opinions. My 93 Ruby with 22k started to intermittently shudder a few months ago. It would be most noticeable at loads under 2200 rpm. It?s not noticeable after that all the way to 7k. Last summer I replaced all 8 original plugs with AC Delco 41-913. Ran fine till this spring. I started digging after it and wound up replacing the #8 plug. Still had the shudder. I drove the car the last 2 days and it ran smooth as glass. I?m thinking it?s a sign of one of the coil packs wearing out. I don?t think it?s a fuel or injector issue as it pulls strong to redline and it probably wouldn?t if it were a bad injector or bad fuel pump(s). No mods to engine and has original wires and coils. Any help gladly appreciated.
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#2 |
![]() Join Date: Aug 2019
Location: Montgomery, NY
Posts: 26
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Meant to post this in the technical section. Can a moderator please move it to there? Thanks
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#3 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 890
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PM me to share phone number and we will talk.
__________________
Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#4 |
![]() Join Date: Aug 2019
Location: Montgomery, NY
Posts: 26
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Hey Steve, not sure if my message went through
Bill McLean 845-629-1763 Thanks brother |
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#5 | |
![]() Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,574
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If an injector leaks, it may be fine off idle and upstairs, but at idle or just off of it, if it is dripping fuel that would cause a shudder / stumble. Certainly also could be a coil pack going south, but that would have the effect on two cylinders / plugs, just one seems to suggest injector. Keep us posted. ![]() Marty |
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#6 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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__________________
[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#7 | |
![]() Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,574
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It is indeed possible, and should also be checked. Normally, I would replace if suspect, but some replacements often are of poorer quality than the originals. If you don't mind the labor of plenum removal, you can swap the one that is suspect with another and see if the problem moves to another cylinder or two. At least then you know, Testing them often does not reveal an issue, but if you do, certainly test them both cold and hot. Again, let us know what you find. ![]() Marty |
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#8 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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__________________
[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 10-22-2022 at 10:24 AM. |
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#9 |
![]() Join Date: Dec 2019
Location: st louis mo
Posts: 748
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If you pull the plenum,just automatically replace coils,they are a weak link since the were born
__________________
95 admiral blue z(sold)/ / 93 ruby z(sold) 91 steel blue z/95 aqua z haibeck 510, 91 callaway 415 areobody #5 |
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#10 |
![]() Join Date: Aug 2019
Location: Montgomery, NY
Posts: 26
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Update?..car is behaving perfectly know all the way to 7k. 200 miles and the issue hasn?t presented itself again. Thank you all for the help and especially Steve Young who walked me through several ZR-1 related things to look out for in the future and some tricks and tip on maintenance.
Bill |
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