spark then no spark, spark then no spark - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old September 11th, 2009, 10:56 PM   #1
rkcbvw
Member
 
rkcbvw's Avatar
 
Join Date: 01-05-07
Location: Zeeland
Posts: 90
iTrader: (1)
Mentioned: 0 Post(s)
Default spark then no spark, spark then no spark

one minute my 4.3L v6 (from a 1999 silverado currently resting in my cj-7) starts fine and will idle as long as I have gas. Then 10 minute later I try to start and I get no spark. 10 minutes later I am getting spark again and starts and runs like a champ. I replaced the ignition coil- no change. Seems to be random on if I get spark or not. What else could it be besides ignition coil? I am running factory computer and harness. Thanks for the help.
rkcbvw is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old September 11th, 2009, 11:51 PM   #2
jbsjunk
Wheelies
 
jbsjunk's Avatar
 
Join Date: 03-01-08
Location: Almost Allendale Mi
Posts: 16,835
iTrader: (36)
Mentioned: 20 Post(s)
Default

Crank sensor going AWOL maybe? I remember the crank sensor synched the ignition and the cam sensor (plastic distributor) took care of the injection. You can unplug the dist and i would still run but the injectors would batch fire instead of sequential.

That's one guess, hopefully I'm going in the right direction.

Edit: Ok. Here's another. The ignition control module. It's next to the coil. They can get some heat in it and it expands and the internals lose contact. It don't happen often in either case, but stranger things have happened.

Last edited by jbsjunk; September 12th, 2009 at 12:09 AM.
jbsjunk is offline   Reply With Quote
Old September 12th, 2009, 12:22 AM   #3
Disturban
Senior Member
 
Disturban's Avatar
 
Join Date: 02-28-08
Location: Lowell, MI
Posts: 2,794
iTrader: (2)
Mentioned: 0 Post(s)
Default

I would bet the ignition control module is bad...seen many many GM's do this.
Disturban is offline   Reply With Quote
Old September 12th, 2009, 07:59 AM   #4
rkcbvw
Member
 
rkcbvw's Avatar
 
Join Date: 01-05-07
Location: Zeeland
Posts: 90
iTrader: (1)
Mentioned: 0 Post(s)
Default

that might be. This problem started after a hot morning out at silver lake. Things were warm.

There is probably no way to test this?
rkcbvw is offline   Reply With Quote
Old September 12th, 2009, 08:04 AM   #5
Disturban
Senior Member
 
Disturban's Avatar
 
Join Date: 02-28-08
Location: Lowell, MI
Posts: 2,794
iTrader: (2)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by rkcbvw View Post
that might be. This problem started after a hot morning out at silver lake. Things were warm.

There is probably no way to test this?
You can test them but it will probably come back as a good part. When places like autozone test them it is not under real world conditions like 220 degree under hood temperatures. When they get hot they fail, cool off and it works again. Good news is there are millions of them in junk yards, go get one for about $10 and see if that fixes the problem. Brand new I think they are about $70.
Disturban is offline   Reply With Quote
Old September 12th, 2009, 09:33 AM   #6
rkcbvw
Member
 
rkcbvw's Avatar
 
Join Date: 01-05-07
Location: Zeeland
Posts: 90
iTrader: (1)
Mentioned: 0 Post(s)
Default

my problem does not seam to be 100% tied to heat. The problem started after a hot day of driving but I can walk up to it cold and it wont start then 10 minutes later starts like a champ. Other times I walk up to it cold and it starts right up, shut off and restarts shut off again, 10 minutes later no spark.

It still seems like you are right, I am going to try the local junk yard today. Thanks for the tip.
rkcbvw is offline   Reply With Quote
Old September 12th, 2009, 12:08 PM   #7
Disturban
Senior Member
 
Disturban's Avatar
 
Join Date: 02-28-08
Location: Lowell, MI
Posts: 2,794
iTrader: (2)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by rkcbvw View Post
my problem does not seam to be 100% tied to heat. The problem started after a hot day of driving but I can walk up to it cold and it wont start then 10 minutes later starts like a champ. Other times I walk up to it cold and it starts right up, shut off and restarts shut off again, 10 minutes later no spark.

It still seems like you are right, I am going to try the local junk yard today. Thanks for the tip.
Yep I said the junk yard because it is an intermittent problem so you might have to throw a few parts at it before you find out what it is. It could also be your ignition, bad ground, pick up coil, ect ect. I would test to make sure you have power to the distributor when you dont have spark, that will at least narrow it down to inside the distributor. Then if you can find a cheap one I would just pick up a whole new distributor at the junk yard that way you know you got the problem and will have some spare parts in the future. I have some U pull your own parts junk yards by my house and could probably get a whole distributor for about $20 maybe $25.
Disturban is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech

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

Forum Jump


All times are GMT -5. The time now is 10:57 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.18617 seconds with 42 queries