06-05-2014 | #1 |
Join Date: Nov 2011
Location: Salt Lake City, Utah
Posts: 169
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Help! Unable to rev past 5000
I have a problem that has me stumped (not hard to do). I am unable to get the car above 5k. When it get close to that rpm it starts missing really badly. If I try to push past it I will get the camshaft sensor error, and the tach bounces from 4500 down to around 2000. This winter I removed the secondaries and installed Marc's chip. It runs great up to about 5000. I installed new fuel injectors last summer and it ran fine with those. I have installed a fuel preassure gauge. I have 42 psi on startup, and 50-51 psi at 5000 rpm. I have put on new Accel coils, new Delco spark plug wires, new spark plugs. Marc send me a spark controller and the problem is still there. I also have installed a new cam shaft sensor, but I only get the code when I don't let off when it starts missing. I have no codes being set.
I need more help from you smart people. Thanks in advance Chris
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91 ZR-1 Red on Red #922 |
06-06-2014 | #2 |
Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,461
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Re: Help! Unable to rev past 5000
Removed.
Head up my .... Last edited by tf95ZR1; 06-06-2014 at 11:26 AM. Reason: Wanted 2 |
06-06-2014 | #3 |
Join Date: Feb 2014
Location: AZ
Posts: 860
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Re: Help! Unable to rev past 5000
You removed your secondaries and now you can't pass 5K? Hmmmm, I'm trying to get feedback on removing secondaries in another thread right now. Maybe this is something to consider. My car runs great right now; I'll be pizzed if I do the old remove-the-secondaries "upgrade" and it messes everything up! Best of luck finding the issue, hopefully something simple.
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06-06-2014 | #4 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Help! Unable to rev past 5000
Quote:
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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06-06-2014 | #5 |
Join Date: Nov 2011
Location: Salt Lake City, Utah
Posts: 169
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Re: Help! Unable to rev past 5000
I don't think that removing the secondaries has caused this problem. I just mentioned it because it eliminated a lot of extra stuff that could cause problems.
Still searching. Chris
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91 ZR-1 Red on Red #922 |
06-06-2014 | #6 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Help! Unable to rev past 5000
Quote:
Long story short, one of the best single investments after buying a Field Service Manual (FSM) I ever made was my scanner. That thing has put a finger right on sooo many issues on several (not all of 'em being Corvettes) cars. Having access to a scanner - especially if you can record real time windows - is a fantastic tool. You might see if an auto parts store will scan it, and maybe do a ride-along to further diagnose the problem. When I first got my 90, as the temperatures warmed up from early spring to summer, I discovered the plastic accordion snorkel tube between the filter housing and the throttle body horn was collapsing at WOT, causing it to nose dive and sputter at about 5000 rpm. I fixed it by making an aluminum sheet metal insert that supports the hose. No more problems. Marc Haibeck can provide some little metal hoops that fit inside the folds of the snorkel. These, I suppose, you might be able to make yourself, if you find the right kind of wire. P. P.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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06-06-2014 | #7 |
Join Date: Jan 2004
Location: Enterprise, Alabama
Posts: 352
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Re: Help! Unable to rev past 5000
Last time that same situation happened to me I found out I had a weak primary fuel pump. Fuel Pressure looked good static but could not keep up with requirement. Replaced pump and it would now rev passed 7K.
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Tony Davila (Projects) Water Meth: http://www.zr1.net/forum/showthread.php?t=19422 Exhaust cut outs: http://www.zr1.net/forum/showthread.php?t=22689 Auxiliary 12V install: http://www.zr1.net/forum/showthread.php?t=22878 Auxiliary pusher fan install: http://www.zr1.net/forum/showthread.php?t=22859 Oil Catch can Project: http://www.zr1.net/forum/showthread.php?t=20320 |
06-06-2014 | #8 | |
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,452
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Re: Help! Unable to rev past 5000
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06-06-2014 | #9 | |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Help! Unable to rev past 5000
Quote:
Concur.. Mine pulls like a freight train.
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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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06-06-2014 | #10 | |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Help! Unable to rev past 5000
Quote:
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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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