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08-20-2014
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#1 |
 Join Date: Oct 2010
Location: NV
Posts: 38
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Bad injectors or vacuum leak?
I have a 1994, 19,000 miles, haibeck intake & port polish, headers.
Car suddenly has no bottom end, meaning bad stumble/dies at idle, when I get into it everything is fine. Since the car sits a lot my initial thought was bad primary injector(s). After searching forum, vacuum leak also looks to be a possibility. Looking for input from anyone experiencing something similar. Thanks, Jack |
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08-20-2014
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#2 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Bad injectors or vacuum leak?
with the miles I'm going to say injectors. a vac leak will cause the car to fall flat high in the rpm band
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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08-20-2014
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#3 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Bad injectors or vacuum leak?
make sure your MAP sensors are connected
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-20-2014
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#4 | |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Bad injectors or vacuum leak?
Quote:
H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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08-20-2014
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#5 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Bad injectors or vacuum leak?
I was having an issue at cruise......had rotted rubber on the MAP sensor that was not visible until close inspection....Fuel Pressure Regulator too
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-20-2014
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#6 |
 
Join Date: Jan 2006
Location: Niceville
Posts: 997
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Re: Bad injectors or vacuum leak?
Jack,
Where are you located? Ted |
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08-20-2014
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#7 |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,649
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Re: Bad injectors or vacuum leak?
Map sensor hose is first guess.
Does it smoke on startup? Second guess is fueling, either fuel pumps or filter. Since it's a '94, injectors aren't as likely to be at fault as if it were a '90 or '91. 'Crabs
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] Last edited by tccrab; 08-20-2014 at 06:03 PM. |
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08-21-2014
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#8 |
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Join Date: Oct 2010
Location: NV
Posts: 38
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Re: Bad injectors or vacuum leak?
Thanks for the responses. I'll try the MAP sensor hose/connections. The ZR is parked in Colorado, I mostly live in Reno though. I'll hold off ordering new injectors and will dig into the MAP sensors when I get back to CO (in a couple months). I hope that's what it is, would rather not get into a plenum pull if I don't need to.
If the MAP sensor is ruled out, I'll start looking at the other suggestions. I'll post back here what I find for reference. Jack
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Reno, NV |
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08-21-2014
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#9 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Bad injectors or vacuum leak?
Quote:
I'll be in Denver next weekend. Where is it in CO. Darby and I can check it out.
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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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08-23-2014
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#10 |
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Join Date: Oct 2010
Location: NV
Posts: 38
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Re: Bad injectors or vacuum leak?
Xfire,
PM sent. thanks, Jack
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Reno, NV |
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