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06-19-2014
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#11 |
 
Join Date: Aug 2004
Location: Wichita, KS
Posts: 22
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Re: Severe Stumble Intermittingly on my 90
Ok, so I tried to pull codes last night (wire to pin K, and grounded to frame). I got nothing....no 12 flashes, nothing. I have never tried to pull codes before, so could be my inexperience, but I tried multiple times, even grounding to negative term of battery. Any suggestions? I did not use a paper clip in the K pin location, simply stuffed the wire in, but was sure I made contact with the brass part of the pin. HOWEVER, interestingly enough I just happened to check the battery cable to positive side of battery and it was loose. How stupid I am if that is all that was wrong. Tightened and fired up for 20 minutes at different idle revs, and never missed a beat. Couldn't take a drive as weather was bad so that will be tonight. Also checked fuel pressure: Static 48 psi, and after starting engine 42, when revving, it jumped up to 50. Thank you Shrade for the suggestion. Any ideas on how to figure out if I can pull codes?
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1990 Red/Tan Mark Haibeck Chip/B & B |
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06-19-2014
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#12 |
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Join Date: Dec 2012
Location: NC
Posts: 1,786
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Re: Severe Stumble Intermittingly on my 90
Sounds good; looks like your FPR is responding properly to vacuum too.
Dash LED still should show testing tho', when you jump the ALDL connectors. I think first 2 pins should initiate the diagnostics  AC/Delco batteries had a problem with battery sockets stripping out of the case - maybe put some dielectric grease on cable screws into battery for good measure...
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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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06-19-2014
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#13 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Severe Stumble Intermittingly on my 90
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Any chance you observed coolant temps when that occurs?
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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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06-19-2014
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#14 | |
 
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
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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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06-19-2014
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#15 |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
everyone says use a paper clip but if you're like me you don't even want to eat a sandwich you made yourself because it has blood and bits of finger in it. buy the fault grounding plugs from gordon https://www.gordonkillebrew.net/Products top right. best $45 ever
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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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06-19-2014
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#16 | ||
  
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: Severe Stumble Intermittingly on my 90
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*BTDT: A faulty O2 on one of my Vettes resulted in mild to severe stumbling, after going CLOSED loop.
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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 Last edited by Paul Workman; 06-19-2014 at 12:04 PM. |
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06-19-2014
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#17 | |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
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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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06-19-2014
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#18 |
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Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Severe Stumble Intermittingly on my 90
My car has a ton of new parts in it and I recently had a weird hesitation coming off of coast to light throttle tip-in. The only thing original is the ign wire/coils which I was starting to suspect, but I did examine the plugs, and checked the fuel pressure was 43-52 as it ought to be etc etc. full power was ok, cold running ok...
Long story short it turned out to be a bad tank of gas... (too much ethanol maybe-I'll probably never know). |
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06-19-2014
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#19 |
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Join Date: Aug 2004
Location: Wichita, KS
Posts: 22
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Re: Severe Stumble Intermittingly on my 90
So....am I supposed to jumper A & B, then ground K to get the codes? I only tried grounding pin K. The idea of getting the jumper from Gordon is a great idea. Will get it ordered. Thanks to all for the help. I hope the battery correct will solve the issue. I will post after I have had a chance to validate.
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1990 Red/Tan Mark Haibeck Chip/B & B |
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06-19-2014
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#20 | |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Severe Stumble Intermittingly on my 90
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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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