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06-27-2014
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#1 |
 Join Date: Jun 2007
Location: Pensacola, Florida
Posts: 14
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Injector problems
I recently changed injectors in 1991 ZR1. Sometimes it cranks fine, runs perfect, and sometimes it sputters out black smoke, and smells like raw gas. I am assuming it is the injectors, but wanted other opinion before i pull them out and have them checked.
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06-27-2014
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#2 |
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Join Date: Dec 2012
Location: NC
Posts: 1,786
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Re: Injector problems
Maybe do static pressure test and leakdown time.
Doesn't seem likely tho', that it's a leak problem...................
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I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG] |
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06-27-2014
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#3 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Injector problems
what injectors did you use? What else has been done to the car recently? who did the work? Are you sure everything is connected properly
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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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06-28-2014
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#4 |
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Join Date: Oct 2008
Location: Colleyville, TX
Posts: 272
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Re: Injector problems
If you didn't flush your fuel rails during replacement it could be a bit of dirt got in an injector. Even if you did flush them it can happen
Goof luck Jim |
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06-28-2014
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#5 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,700
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Re: Injector problems
Quote:
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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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06-28-2014
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#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: Injector problems
Sounds like a leaking injector. As suggested, a static leak test will verify it, and if so, the injector(s) at fault can be isolated.
Install a fuel pressure gauge to the Schrader valve on the front of the passenger side fuel rail. Turn the ignition switch to RUN, without starting the motor, just long enough for fuel pressure to stabilize. Monitor the pressure. If all is well, pressure should hold to within a couple pounds for 10-30 minutes (mine held to 30 min). (But, in your case, it sounds like a major leak, and you may even be able to observe fuel jetting from the bad injector if the ignition switch is left in RUN long enough to look down the IH bores at all 16 injectors.)
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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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06-28-2014
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#7 |
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Join Date: Aug 2005
Location: Iuka, Mississippi 38852
Posts: 756
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Re: Injector problems
Read your plugs.
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06-28-2014
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#8 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,786
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Re: Injector problems
If your lines were fouled, your INJ's might need breakdown...
Quote:
__________________
I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG] |
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06-28-2014
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#9 |
Join Date: May 2013
Location: Chicago
Posts: 980
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Re: Injector problems
Curious as to what type of injectors did you use?
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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What can ya' do to an injector with a hammer, a prybar, and a 16mm open end? 
Linear Mode
