91 ZR-1 Cutting Out Under Load - Page 18 - ZR-1 Net Registry Forums

GregCrowe · 03-18-2009

Quote:

Originally Posted by XfireZ51

Greg,

Try fitting some spade lugs in the slots and then connecting Ohmeter to them.

Spades wouldn't even fit up in those tiny slots. I did however use some wires.

Testing of the original GM coils got me:

Primary / Secondary
1. .6 ohms / 5.63 k-ohms
2. .6 ohms / 5.57 k-ohms
3. .6 ohms / zero
4. .6 ohms / zero

All the stock coils look fine on the primary readings. The secondary readings do look suspect.

I'll try to pull the Summit/Accel coils and get a primary reading on them today if possible.

GregCrowe · 03-21-2009

I bought a set of brand new GM ZR-1 D545 coils.

So.........More coils, more tests:

Summit/Accels :

Primary / Secondary
1. .7 ohms / 7.02 k-ohms
2. .6 ohms / 7.06 k-ohms
3. .6 ohms / 7.06 k-ohms
4. .7 ohms / 7.00 k-ohms

Brand New GM D545's

1. .5 ohms / 5.71 k-ohms
2. .5 ohms / 5.64 k-ohms
3. .5 ohms / 5.66 k-ohms
4. .5 ohms / 5.66 k-ohms

The one thing I did notice on the Summit Accel coils was that the slots on the bottom of each coil(that the 2 spade terminals plug into) were bigger and more loose than on the GM coils. They definitely don't make a nice tight connection. That may be the problem.

I should have the car back together tomorrow and we'll see if it's fixed.

GregCrowe · 03-22-2009

IT'S FIXED !!!!!!!!!!

Yes folks, my ZR-1 is running like a champ again. New GM D545 coils fixed the problem. The high rpm power is awesome. No cutting out, no miss, no falling on it's face.

For the record, let it be know that SUMMIT/ACCEL COILS SUCK !!!!!!

These are absolute JUNK !

I will be having a nice conversation with Summit tomorrow.

I would like to thank everyone out here for their help over the past 3 years and especially JeffVette.

Jagdpanzer · 03-22-2009

Congratulations Greg!!
The entire ZR-1 brotherhood applauds you!
Your perseverance, determination, and resourcefulness have finally paid off.
34 months, 173 posts, 8,600 looks later and the problem is now solved
....and at the end you got it right about the coils.
I almost picked up a set of Accels a while back for spares but went with the MSD 8224's instead. Just checked them and they meg out the same as your new set of GM D545's.

03-22-2009

Quote:

Originally Posted by GregCrowe

IT'S FIXED !!!!!!!!!!

Yes folks, my ZR-1 is running like a champ again. New GM D545 coils fixed the problem. The high rpm power is awesome. No cutting out, no miss, no falling on it's face.

For the record, let it be know that SUMMIT/ACCEL COILS SUCK !!!!!!

These are absolute JUNK !

I will be having a nice conversation with Summit tomorrow.

I would like to thank everyone out here for their help over the past 3 years and especially JeffVette.

Glad to hear Greg. Go and give summit hell.

gbrtng · 03-22-2009

Is the LT5 coil a common GM part?

GregCrowe · 03-22-2009

Quote:

Originally Posted by gbrtng

Is the LT5 coil a common GM part?

Very common. GM D555 or D545. I have no idea what the difference is between the 2 part numbers. It's the same coil as used on almost every GM V6. 3 coils on the V6, 4 on the ZR-1 V8.

GregCrowe · 03-22-2009

I may have figured out the difference between the GM D545 vs the GM D555 coil. The D545 lists for 70 cents more than the D555. It looks like the D545 comes with a little rubber gasket a hair over an inch long that goes around the 2 pin connectors under the coil. From best I can tell, the D555 comes without the rubber gasket.

GOLDCYLON · 03-22-2009

Damn awesome !! Makes me feel better I changed out mine with GM replacements as well when I had the top end done. Damn gald to hear you chased that problem down!! I considered going the Summit route as well

tccrab · 03-23-2009

Good Job Greg!

I commend you for your perseverance.

I personally would have given up hope after only a month or two, but you've hung in there for nearly 3 long years.
Simply Amazing.

Now, get in it and.....

DRIVE IT LIKE YOU STOLE IT!!!

Congratulations, my hat is off to you.
Long live the beast.

TomC
"Crabs"

03-21-2009	#172
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	Re: 91 ZR-1 Cutting Out Under Load I bought a set of brand new GM ZR-1 D545 coils. So.........More coils, more tests: Summit/Accels : Primary / Secondary 1. .7 ohms / 7.02 k-ohms 2. .6 ohms / 7.06 k-ohms 3. .6 ohms / 7.06 k-ohms 4. .7 ohms / 7.00 k-ohms Brand New GM D545's 1. .5 ohms / 5.71 k-ohms 2. .5 ohms / 5.64 k-ohms 3. .5 ohms / 5.66 k-ohms 4. .5 ohms / 5.66 k-ohms The one thing I did notice on the Summit Accel coils was that the slots on the bottom of each coil(that the 2 spade terminals plug into) were bigger and more loose than on the GM coils. They definitely don't make a nice tight connection. That may be the problem. I should have the car back together tomorrow and we'll see if it's fixed. Last edited by GregCrowe; 03-21-2009 at 04:55 PM.

03-22-2009	#173
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	Re: 91 ZR-1 Cutting Out Under Load IT'S FIXED !!!!!!!!!! Yes folks, my ZR-1 is running like a champ again. New GM D545 coils fixed the problem. The high rpm power is awesome. No cutting out, no miss, no falling on it's face. For the record, let it be know that SUMMIT/ACCEL COILS SUCK !!!!!! These are absolute JUNK ! I will be having a nice conversation with Summit tomorrow. I would like to thank everyone out here for their help over the past 3 years and especially JeffVette.

03-22-2009	#174
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,651	Re: 91 ZR-1 Cutting Out Under Load Congratulations Greg!! The entire ZR-1 brotherhood applauds you! Your perseverance, determination, and resourcefulness have finally paid off. 34 months, 173 posts, 8,600 looks later and the problem is now solved ....and at the end you got it right about the coils. I almost picked up a set of Accels a while back for spares but went with the MSD 8224's instead. Just checked them and they meg out the same as your new set of GM D545's. Last edited by Jagdpanzer; 03-22-2009 at 06:54 PM.

03-22-2009	#176
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,183	Re: 91 ZR-1 Cutting Out Under Load Is the LT5 coil a common GM part? __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer

03-22-2009	#178
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	Re: 91 ZR-1 Cutting Out Under Load I may have figured out the difference between the GM D545 vs the GM D555 coil. The D545 lists for 70 cents more than the D555. It looks like the D545 comes with a little rubber gasket a hair over an inch long that goes around the 2 pin connectors under the coil. From best I can tell, the D555 comes without the rubber gasket.

03-22-2009	#179
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,120	Re: 91 ZR-1 Cutting Out Under Load Damn awesome !! Makes me feel better I changed out mine with GM replacements as well when I had the top end done. Damn gald to hear you chased that problem down!! I considered going the Summit route as well __________________ 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

03-23-2009	#180
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,663	Re: 91 ZR-1 Cutting Out Under Load Good Job Greg! I commend you for your perseverance. I personally would have given up hope after only a month or two, but you've hung in there for nearly 3 long years. Simply Amazing. Now, get in it and..... DRIVE IT LIKE YOU STOLE IT!!! Congratulations, my hat is off to you. Long live the beast. TomC "Crabs"

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