blazer ignition problems, i think - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > Brand Specific Tech > Chevy
Notices

Reply
 
Share Thread Tools Display Modes
Old 07-07-2005, 09:39 PM   #1 (permalink)
Registered User
 
Join Date: Dec 2003
Member # 25305
Location: SF bay area
Posts: 48
blazer ignition problems, i think

Hi

This is going to be a little long, sorry

I acquired an 86 k5 blazer about a month ago and it ran pretty well, though i only got to drive it about 15 miles before parking it for a month. It has been thoroughly desmogged and kluged in innumerable ways. I tried at least starting it a few times in the mean time, though only managed to find time to drive around the block. No problems, i think.

Yesterday i decided it was about time to bring it the rest of the way home, a whopping 6 miles. It made it about 3 blocks before refusing to start. During the three blocks it would run ok till i had to stop, then cut out and immediately restart. It was at one of these stops that it didnít come back.

Today i replaced the distributor cap, rotor, coil, plugs and wires. I presume the timing is good enough as it did run not too long ago. I forgot to reconnect the plugs in the dizzy for a minute or two of cranking, and it almost caught when i did reconnect them. It didnít stay running so i tried grounding a spare plug attached to a wire to the intake manifold and it didnít spark at all.

The carb is a holley double pumper that is probably doing too much pumping. When i removed the old spark plugs they were dark sooty black.

So, my theory is that for whatever reason iím not getting consistent spark. Iím not sure where to start, iím not a good electrical person, and any help is much appreciated.

thanks
__________________
-bryan
89 fj62
baldredhead is offline   Reply With Quote
Old 07-07-2005, 10:18 PM   #2 (permalink)
Registered User
 
Join Date: Jan 2002
Member # 9357
Location: Mojave
Posts: 1,200
Your original problems sounded fuel related to me but they could be anything. Cranking the engine with no wires attached to the dizzy can burn out a coil but might take a lot. You shouldnt have to ground a plug, a healthy coil will produce a spark you can see directly from the distributor cap to the plug wire up to an inch away. Sooty plugs means rich. Hope this helps.

Charlo
__________________
Scrap metal with a chevy logo in front. BB,FI,1T,
charlo is offline   Reply With Quote
Sponsored Links
Old 07-08-2005, 08:26 AM   #3 (permalink)
Registered User
 
Join Date: Dec 2003
Member # 25305
Location: SF bay area
Posts: 48
Charlo

i had to ground a plug because the boot on the plug wire won't pull back so i can see the spark.

i probably have two issues

edit:
something i forgot to mention origianlly is that one or two of the times i did get it started i pulled the negative lead from the battery the idle speed picked up and in general the idle improved. does that mean anything?
__________________
-bryan
89 fj62

Last edited by baldredhead; 07-08-2005 at 09:37 AM.
baldredhead is offline   Reply With Quote
Old 07-09-2005, 06:04 PM   #4 (permalink)
Registered User
 
Join Date: Apr 2005
Member # 46123
Posts: 50
i'd think maybe ignition module, just dont get an accel one, went through 2 in 100 miles.
85blackdiamond is offline   Reply With Quote
Old 07-11-2005, 10:45 AM   #5 (permalink)
Registered User
 
Join Date: Dec 2003
Member # 25305
Location: SF bay area
Posts: 48
daaaaarhg

tried that last night, a generic one from NAPA but no luck. i'm about to haul out the elephant gun and put this truck out of my misery
__________________
-bryan
89 fj62
baldredhead is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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



All times are GMT -7. The time now is 12:15 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.