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#1 |
![]() Join Date: Feb 2011
Location: Vicksburg, MS
Posts: 135
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I haven't started the car for 5-6 weeks. Start it this morning and heard a knock for a few seconds until oil pressure built up. Went for a drive with my dad and it never did it again on start up. This is the only time the cars ever done it, and it's the longest the cars sat with out being started since I've owned it.
Any ideas what it was, and should I worry, or is it normal? Lack of oil until pressure is built?
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[B][U]1991 No. 519[/U][/B] Last edited by Dime; 03-11-2012 at 12:29 AM. |
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#2 |
Join Date: Dec 2007
Location: Fremont,Ca
Posts: 3,058
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Cam chains,the oil has drained from the filter and it takes a few seconds to pump up.The Bosch filter has a better check valve than the others on the market and it holds oil a little better.
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#3 | |
![]() Join Date: Mar 2008
Location: Pendleton, IN
Posts: 647
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![]() Quote:
Read it here:http://www.zr1specialist.com/HAT%20W...ate%202011.pdf |
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#4 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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I bought mine at 27k miles and it didn't do it, but 5k miles later and some different oil filters, it finally started up with the noise. Really nothing has to be done about it, but you might be able to find a new cam tensioner to fix it,
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#5 | |
![]() ![]() ![]() Join Date: May 2007
Location: Peoria, AZ
Posts: 9,154
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Only if its the ugraded RH Cam Tensioner which allows the oil to pool a little
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director ![]() 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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#6 |
Join Date: Mar 2009
Location: Orlando, FL
Posts: 1,828
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It's more an annoyance than a real problem. The chain guide is tapping against the cylinder head. The chain is not subject to any additional wear.
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2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold) |
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#7 |
![]() Join Date: Feb 2011
Location: Vicksburg, MS
Posts: 135
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That's what I thought (or hoped) it was. I never heard it do it before. It was a lot more racket than I expedited chain rattle to be. I was wondering why other owners complained about chain rattle. Now I know. I'm just glad it has only done it this that one time so far. Hopefully I'm lucky enough that it will only do it after sitting for a long period of time.
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[B][U]1991 No. 519[/U][/B] |
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#8 |
![]() Join Date: Jul 2005
Location: Cresson, TX
Posts: 970
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I've never heard the chain make a knocking sound it's always been a rattle... You know it could have been the DMF. It can knock until the engine smoothes out...
Last edited by RHanselman; 03-11-2012 at 07:11 PM. |
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#9 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,655
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Here are a couple of excellent tech articles Marc Haibeck wrote on the subject of the LT5 cam drive. As our engines gracefully mature we need to be especially mindful about the condition of the upper cam chain guide strips as Marc points out in his article. Failure to maintain the upper guide strips will lead to the breakage of cam chains which otherwise would have served reliably for many more thousands of miles to come. I know of two recent cam chain breakages on higher mileage LT5s due to this issue. An expensive headache that one should avoid.
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake Last edited by Jagdpanzer; 03-11-2012 at 10:00 PM. |
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#10 |
Join Date: Sep 2008
Location: Maryland
Posts: 119
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I know its not a end all, cure all but when mine sits for extended periods of time, I spin off the oil filter, dump some oil down the center cavity of the filter housing, spin the filter back on and start up, without doing this, I would get momentary chain rattle, by adding this small amount of oil, chain rattle is not heard or detected on a start up after extended inactivity.
My guess is this oil going to the pick up tube fills quickly and fills the oil filter much faster. Has anyone ever done a oil filter relocation on a LT-5 where the filter sits in a right side up position and is always full and can't drain back , this in itself should slow down or stop the "Dry Filter Syndrom" and either slow down or stop this momentary rattle of the TC's...... Gibby Last edited by zrwhat; 03-12-2012 at 09:15 AM. |
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