2nd Generation S-series (1995-2005) Tech Discuss 2nd generation S-series (1995-2005) general tech topics here.

spark at coil, none at spark plugs

Thread Tools
 
Search this Thread
 
  #1  
Old 03-17-2014, 08:40 AM
JavierEscalonJr's Avatar
Starting Member
Thread Starter
Join Date: Jan 2013
Location: Xenia, Ohio
Posts: 105
JavierEscalonJr is on a distinguished road
Default spark at coil, none at spark plugs

Sorry if this has been answered I've tried searching since Saturday on here, google, and Bing. Its a 96 blazer 4.3L 4wd.
My sister was driving it she says she heard like 3 pops and it died, I got there tried to jump it nothing tried starter fluid because my fuel pump is going out nothing, so I started searching around so I figured it isn't getting spark I unplugged the coil from the distributor got a small orange spark switched it out got a blue spark. Then I removed cable 1 stuck a screwdriver in there no spark tried the second one no spark. I towed it home with a tow strap. Got there I removed the distributor and the rotor inspected found no cracks or anything. So my dad said to try the pickup coil in the distributor I replaced it no go. So now I am at a loss what could it be? Money is a bit tight right now
I really appreciate any help you guys can give me
 
  #2  
Old 03-17-2014, 03:07 PM
burned's Avatar
Junior Member
Join Date: Apr 2012
Location: Vancouver, BC, Canada
Posts: 368
burned is on a distinguished road
Default

If you have a nice blue spark at the coil, then its either the coil wire to the distributor or the distributor cap and rotor.

Here is a guide for you to follow:
http://easyautodiagnostics.com/gm_mi...re_tests_3.php
 

Last edited by burned; 03-17-2014 at 03:10 PM. Reason: Added guide
  #3  
Old 03-17-2014, 04:19 PM
JavierEscalonJr's Avatar
Starting Member
Thread Starter
Join Date: Jan 2013
Location: Xenia, Ohio
Posts: 105
JavierEscalonJr is on a distinguished road
Default

Both rotor and cap have continuity I got the spark from the coil with its wire
 
  #4  
Old 03-17-2014, 08:16 PM
Captain Hook's Avatar
Moderator
Join Date: Mar 2009
Location: Belleville, Michigan
Posts: 8,453
Captain Hook is a jewel in the roughCaptain Hook is a jewel in the roughCaptain Hook is a jewel in the rough
Default

Install an AC Delco cap & rotor, and a good quality set of plug wires, and you'll be good to go. Don't waste your time and money on an aftermarket cap & rotor.

EDIT: The sensor inside the distributor is the camshaft position sensor. It will not cause a no-start condition. You can unplug it and the engine will still start and run.
 
  #5  
Old 03-17-2014, 08:48 PM
JavierEscalonJr's Avatar
Starting Member
Thread Starter
Join Date: Jan 2013
Location: Xenia, Ohio
Posts: 105
JavierEscalonJr is on a distinguished road
Default

Would that cause the truck just die while driving? Cap and rotor were replaced about 12 months ago and I have some taylor cables on it,are they any good
 
  #6  
Old 03-17-2014, 08:56 PM
scottl1346's Avatar
Starting Member
Join Date: Jan 2010
Location: mass
Posts: 171
scottl1346 is on a distinguished road
Default

when a bad ignition coil is heated up it will cause the truck to die while driving
 
  #7  
Old 03-17-2014, 08:58 PM
Captain Hook's Avatar
Moderator
Join Date: Mar 2009
Location: Belleville, Michigan
Posts: 8,453
Captain Hook is a jewel in the roughCaptain Hook is a jewel in the roughCaptain Hook is a jewel in the rough
Default

A cap and rotor can fail without warning. Most of the time you can't see what's causing the problem. When the engine is at idle, approximately 7,000 to 10,000 volts jump the gap between the cap & rotor. That's a pretty serious spark, and aftermarket caps don't deal with it very long Gotta use AC Delco, and put a dab of silicone dielectric grease on each terminal, inside and out, of the cap. Good for 100K miles.
 
  #8  
Old 03-17-2014, 09:05 PM
JavierEscalonJr's Avatar
Starting Member
Thread Starter
Join Date: Jan 2013
Location: Xenia, Ohio
Posts: 105
JavierEscalonJr is on a distinguished road
Default

Will try tomorrow if I have time
 
  #9  
Old 03-18-2014, 08:48 AM
JavierEscalonJr's Avatar
Starting Member
Thread Starter
Join Date: Jan 2013
Location: Xenia, Ohio
Posts: 105
JavierEscalonJr is on a distinguished road
Default

Thanks for your help guys it started in a half crank just wondering why the cap failed like that in other news my grille broke it seems that it couldn't support my weight
 

Last edited by JavierEscalonJr; 03-18-2014 at 08:51 AM.
  #10  
Old 03-18-2014, 12:58 PM
Captain Hook's Avatar
Moderator
Join Date: Mar 2009
Location: Belleville, Michigan
Posts: 8,453
Captain Hook is a jewel in the roughCaptain Hook is a jewel in the roughCaptain Hook is a jewel in the rough
Default

Aftermarket distributor caps are about worthless on this engine. Certain brands are worse than others, AZ being the worst.
 


Quick Reply: spark at coil, none at spark plugs



All times are GMT -5. The time now is 11:56 PM.