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05-18-2008
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#1 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Weak Coils?
what are some syptoms of weak coils?
I read through RogerZR-1's thread and he ended up have weak coils.. If a coil or Coils are weak as temperature increases is it possible that the coils would get worse? I am thinking maybe that could be an issue with mine too, as I noticed a slight stumble in Open loop tonight while driving it.. but once in closed loop and the car was warmer it was worse.. going to check fuel pressure now to see if it holds after the key is out
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-19-2008
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#2 |
 
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: Weak Coils?
Yes, the symptoms of a short would get worse the hotter the windings + oil gets.
Kind of like what happens with the early OEM injector coils. You could ohm them out after they are hot & compare that to a cold ohm reading. Or just pull a plug wire & stick a plug in the end & ground it & look at the spark intensity.  Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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05-19-2008
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#3 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Weak Coils?
just curious, trying to find the stumble issue.. as it gets warmer it gets worse.
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-19-2008
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#4 |
Join Date: Sep 2007
Location: Georgia
Posts: 231
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Re: Weak Coils?
Is the car stumbling with the power key off? My car drove worse with the power key off. The biggest thing that my car did on a consistent basis was stumble at low rpm when I got on the gas, like being in 6th gear at 2000 rpm and accelerating. The car would always stumble. After Jeff Flint changed the coils it has been running great, no problems at all.
Hope this may help. I am still new to all of this stuff but wanted to chime in.
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Roger Miller 91 ZR-1 #391 |
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05-19-2008
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#5 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Weak Coils?
so far, key on or off makes no difference..
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-19-2008
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#6 |
Join Date: Jul 2005
Location: Mendota Heights, MN. 55120
Posts: 984
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Re: Weak Coils?
My Z is at DRM now for the same problem. I put new Accel coil packs in when I had the plenum removed. Doug told me that the Accels get too hot for our cars and that the original GM's should be installed. I got this report last week and have not heard back from Doug yet. I hope the GM's are still available. Mine would stumble with or without the key on. Usually around 4000 rpm's. Doug said that when the car was warm/hot, on the dyno, the stumble would occur. I will be talking to him early this week so I can keep everyone posted. Fuel pressure was OK - injectors were just R/R'd from RC - no vaccum leaks. ?????
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Bob Anderson 1990 #2405 White/Gray Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported Minnesota State Director Founding Member #19 |
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05-19-2008
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#7 |
 
Join Date: Nov 2006
Location: dayton,ohio
Posts: 425
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Re: Weak Coils?
Autozones duralast only lasted a year and started stumbling. AC delco now for two years with no problems.
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[FONT=Comic Sans MS][COLOR=red]"I wanna go fast!!"[/COLOR][/FONT] [FONT=Comic Sans MS][COLOR=#ff0000]-- Ricky Bobby[/COLOR][/FONT] |
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05-19-2008
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#8 | |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Weak Coils?
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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05-19-2008
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#9 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Weak Coils?
Quote:
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-19-2008
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#10 |
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Join Date: Jul 2005
Location: Mendota Heights, MN. 55120
Posts: 984
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Re: Weak Coils?
When I talked to Doug Rippie this morning he said that he had the GM coils and was going to install tomorrow. He reiterated that fact that the after market coils will fail at some point - "cannot take the heat under the plenum". I don't know what the cost will be but having the peace of mind of what Doug said makes me feel better. He hopes to have the Z tuned and dyno'ed tomorrow. Hoping to see 390+ when it's done.
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Bob Anderson 1990 #2405 White/Gray Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported Minnesota State Director Founding Member #19 |
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