LT1 coil. Think its bad. Need confirmation.. Shoebox? - CamaroZ28.Com Message Board

Go Back   CamaroZ28.Com Message Board > 1967-2002 Powertrain Discussion > LT1 Based Engine Tech

Reply Post New Thread
 
 
LinkBack Thread Tools Search this Thread
Old 01-14-2004, 06:35 PM   #1
Registered User
 
Join Date: Oct 1999
Location: Tampa Florida
Posts: 1,491
Send a message via ICQ to ZDriver96
LT1 coil. Think its bad. Need confirmation.. Shoebox?

Ok... the car wont start.
Cranks but wont fire.
I pulled the wire and plug out on one of the ports.
I grounded the spark plug against my header and shock tower brace and had a friend try and start the car... There was no spark..
It did spark just once on one occassion but we tried again and again but it wouldnt spark it again.

So i looked up Shoeboxes coil test page.
I un hooked the coil and tested it.
The coil read 5.75 thousand ohms on each connector.
But on my coil 1996, there are only 3 leads while on shoeboxs page it has 4 leads. Im guessing its a pre 1996 fbody...

So what does everyone think..
Bad coil...

Just need confirmation on it before i go buy one.. And does autozone or discount auto or napa have a AC delco or equivalent coil? I dont want a junk one. And i dont have time to order one on line.. thanks
__________________
96 M6 Arctic White Z28 355 Forged
Plates "SLOW LT1"
LE2 Heads, LE 2.3, Suspension and Brake upgrades
390rwhp 365ft lbs torque
ZDriver96 is offline   Reply With Quote
Old 01-14-2004, 06:44 PM   #2
Registered User
 
shoebox's Avatar
 
Join Date: Dec 1969
Location: Little Rock, AR
Posts: 27,147
Yes, your coil is a later model 3 terminal coil. However, it sounds like yours is ok. My MSD Blaster coil actually measures closer to what yours is. That may be one reason they say the 3 terminal coils are better factory coils.

You may have ICM or opti problems.
shoebox is offline   Reply With Quote
Old 01-14-2004, 06:51 PM   #3
Registered User
 
Join Date: Oct 1999
Location: Tampa Florida
Posts: 1,491
Send a message via ICQ to ZDriver96
damn.... how do i check the ICM?

If its not that i guess i'll yank the opti again.. it only has 25 thousand miles on it.

thanks for the quick response shoebox
__________________
96 M6 Arctic White Z28 355 Forged
Plates "SLOW LT1"
LE2 Heads, LE 2.3, Suspension and Brake upgrades
390rwhp 365ft lbs torque
ZDriver96 is offline   Reply With Quote
Old 01-14-2004, 06:58 PM   #4
Registered User
 
shoebox's Avatar
 
Join Date: Dec 1969
Location: Little Rock, AR
Posts: 27,147
Don't know any tests for the ICM, but some auto parts stores can test them.

You can do some other testing, though.
shoebox is offline   Reply With Quote
Old 01-14-2004, 07:01 PM   #5
Registered User
 
Join Date: Oct 1999
Location: Tampa Florida
Posts: 1,491
Send a message via ICQ to ZDriver96
Cant get to an auto parts store though.. Can i bring in the coil with the ICM attached for it to be tested? Or does it have to be in the car?

I read up on the ICM in the searchs..

One said his car wouldnt start at all

And 2 said the car would shut off at around 180 degrees..

I suppose i'll go pick up an ICM tomorrow at the dealership.. i dont want to get a generic one...

So with this info the only think i can think of is

That ICM or the optispark.

Any other possibilities...
Fuel is fine,
No spark.
Coil reads 5.75 k ohms..
__________________
96 M6 Arctic White Z28 355 Forged
Plates "SLOW LT1"
LE2 Heads, LE 2.3, Suspension and Brake upgrades
390rwhp 365ft lbs torque
ZDriver96 is offline   Reply With Quote
Old 01-14-2004, 07:08 PM   #6
Registered User
 
shoebox's Avatar
 
Join Date: Dec 1969
Location: Little Rock, AR
Posts: 27,147
I think all they need to do is plug into the ICM, so it may be ok for it to still be on the bracket with the coil.
shoebox is offline   Reply With Quote
Old 01-14-2004, 07:14 PM   #7
Registered User
 
Join Date: Feb 2003
Location: Statesville NC
Posts: 1,109
Send a message via AIM to HBHRacing Send a message via Yahoo to HBHRacing
Shoebox.. I have found that you can test the icm to a point.. but not really.. if you have the pulsing ground on the green wire going to the coil the ICM is good and if you still have no fire it;s teh coil... usualy when the ICM shorts you get a steady ground on the green wire and it will not fire the coil because of it.


usualy what I do is check for injector pulse and the pulsing ground at the Coil and if they are present I know the optical sensors are ok..

I have found the best way to chek spark is with a grounded test light held near the spark tower of teh coil and seeing how strong and how far it reaches
__________________
96 Z28 M6. Silver. ASE Master Certified Automotive Technician.
HBHRacing is offline   Reply With Quote
Old 01-14-2004, 07:27 PM   #8
Registered User
 
Join Date: Jun 2002
Location: hudson,florida
Posts: 720
hello i just replaced my icm jason crower at sam taylor 55 dollars the dealership wanted twice that price took 3 days to get here though.
__________________
1994 6 speed sold.....new car 2008 chevrolet Corvette ls3, npp exhaust, intake etc.....
besz28 is offline   Reply With Quote
 
Reply Post New Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
EBAY true duals alphaauto LT1 Based Engine Tech 5 01-22-2015 08:02 PM
Bad map? Amshnock Fuel and Ignition 14 01-18-2015 11:47 AM
LT1 engine swap help needed. 1996 z28 motor/trans into 1995 z28 dbusch22 LT1 Based Engine Tech 2 01-05-2015 07:14 PM
LT1 stuff for sale Hot Rod Hawk Midwest 4 08-30-2002 10:12 PM


All times are GMT -5. The time now is 07:37 AM.

 

Copyright © 1996-2013 CamaroZ28.Com. All rights reserved.