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no spark...wont start!

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Old Mar 25, 2008 | 07:47 PM
  #1  
elctron02's Avatar
elctron02
Thread Starter
Instructor
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Joined: Nov 2002
Posts: 198
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From: NY
Default no spark...wont start!

heres the story... I have a 72 lt1 with MSD box...the car wont start.
its been fine, then one day no start.

here is a list of new parts and what I did.

1year old battery ....ok
new MSD box ...ok
1yr old super coil...ok when I jump the MSD box to test spark....
1yr old plugs and wires ..ok
new distributor cap and rotor.
new starter

The car cranks but will not turn over.
I get a spark from the coil when I test jump the MSD box. if I try to start with the coil wire off to get a spark near ground I get nothing, then a spark... but most of the time nothing.
I test the spark from wire to plug...nothing...
So, i dont know if it the coil or the distributor is bad...I did have a bad connection with the distributor wires. but I redid those!!!!

what do u think?????
need new distributor or and coil???
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Old Mar 25, 2008 | 08:21 PM
  #2  
sniperdiver37's Avatar
sniperdiver37
Burning Brakes
 
Joined: Dec 2004
Posts: 825
Likes: 0
From: Hanging out back with the dark horses. Wa.
Default

Originally Posted by elctron02
heres the story... I have a 72 lt1 with MSD box...the car wont start.
its been fine, then one day no start.

here is a list of new parts and what I did.

1year old battery ....ok
new MSD box ...ok
1yr old super coil...ok when I jump the MSD box to test spark....
1yr old plugs and wires ..ok
new distributor cap and rotor.
new starter

The car cranks but will not turn over.
I get a spark from the coil when I test jump the MSD box. if I try to start with the coil wire off to get a spark near ground I get nothing, then a spark... but most of the time nothing.
I test the spark from wire to plug...nothing...
So, i dont know if it the coil or the distributor is bad...I did have a bad connection with the distributor wires. but I redid those!!!!

what do u think?????
need new distributor or and coil???
MSD requires 12 volts when cranking, make sure batt is charged. back to the basics, air, fuel, spark, timing
Reply
Old Mar 25, 2008 | 09:14 PM
  #3  
Ironcross's Avatar
Ironcross
Race Director
10 Year Member
 
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
Default

If the plugs are wet from numerous attempts at starting it WILL NOT run. If this is the issue, clean the plugs with carb cleaner or starting fluid and put them back in. .
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Old Mar 25, 2008 | 09:36 PM
  #4  
ENG40's Avatar
ENG40
Racer
 
Joined: Nov 2007
Posts: 320
Likes: 0
From: Upstate New York
Default

Intermittent spark could be bad distributor sensor or module.
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Old Mar 26, 2008 | 03:43 PM
  #5  
The3's Avatar
The3
Racer
 
Joined: Apr 2006
Posts: 450
Likes: 0
From: Alexandria Va
Default

Make sure the ground wire from the MSD box is properly grounded. Mine was not and exhibited the same symptons as yours.
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