Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Past Chevy Truck, SUV & Vans > K5 Blazer
Sign in using an external account
Register Forgot Password?
Search

K5 Blazer 1969-1994
While this model ended its run, it is not uncommon to see them on the road or off, years after production end.
Platform: Truck, GMT 400

Reply
 
 
 
 
LinkBack Thread Tools
  #1  
Old 09-14-2009, 11:40 AM
CF Beginner
 
Join Date: Sep 2009
Posts: 5
Default No spark!

I have a '86 K5 that I have changed out the 305 for a 350. The 350 motor is made up of a '79 block with '69 fueler heads, Edelbrock preformer intake and cam and a 600 cfm carb. I have fuel to the carb and I have 12.5 volts going into the distributor but no spark at the plugs. I took the coil and ignition control module in and had them tested and they passed. The engine control module has been removed so there is a jumper on the 4 pin connector on the distributor. I have verified that the rotor turns when I crank the engine. I even replaced the car and rotor but still no luck. The blazer started and ran great before the 305 motor died so is it my dumb luck that the distributor when the motor died? What else can I try to get spark?
Register today for free or log-in if already registered to remove this ad!

Last edited by 86K5toy; 09-14-2009 at 11:52 AM.
Reply With Quote
  #2  
Old 09-14-2009, 06:49 PM
CF Junior Member
 
Join Date: Sep 2009
Location: Arapahoe, NC
Posts: 30
Default

Have you checked the pick-up inside the distributor? It's the one that if you need to replace the shaft has to come out and then put in new pick-up.
__________________
'97 Suburban K1500, 4.10 gears

'97 Nissan Sentra, GSE

'96 Dodge 3500, 4X2, 5.9 Cummins, highflow exhaust, valve body tweaked, KDP killed, boost-pyro-trans temp on A-pillar

'92 Starcraft 25' TT
Reply With Quote
  #3  
Old 09-15-2009, 09:26 AM
frickenbored's Avatar
CF Active Member
1988 Chevrolet Blazer
 
Join Date: Aug 2009
Location: Michigan
Posts: 266
Default

This prob wont help any but a while ago I changed most of my gauges to electric gagues, I mounted them in the stock places so it looked like they were supposed to be there, turns out that one of my negative wires from a gauge was touching the circuit board that fed power to the stock gauges and because of that I had no spark...i have no idea why this happened and it took forever to find that.

As for your problem, you say you had an ECM so i'm guessing your 305 was TBI, if so I thought you needed diffrent distributors for a TBI system and a carburated system. I did in my case.
__________________


"People I respect, heroes of mine would be Bobe Hope. Abraham Lincoln, definitely. Bono. Uh, and probably
God would be the fourth one. I just think all those people really helped the world in so many ways." -Michael Scott
Reply With Quote
  #4  
Old 09-16-2009, 06:58 AM
CF Beginner
 
Join Date: Sep 2009
Posts: 5
Default

RPegram,
thanks for the input. What is the best way to test the pick up coil? Is it a continuity test?

Frickenbored,
The 305 was not TBI. 1986 was the last year before they changed. Since the ECM has been removed the and the jumper installed the distributor should not know that it is in a 350 and not a 305. right? At the parts store they did list a different distributor for the 305 and 350 but I would think that is only if the ECM is hooked up. I would hate to install the new distributor and still have the same problem. Electrical parts and non-returnable.
Reply With Quote
  #5  
Old 09-16-2009, 08:16 AM
frickenbored's Avatar
CF Active Member
1988 Chevrolet Blazer
 
Join Date: Aug 2009
Location: Michigan
Posts: 266
Default

My bad, I forgot that 87 was the year for TBI...You shouldn't need a new distributor then, a couple months ago my buddy swaped out his 350 for a 305 in his 85 chevy truck (he wanted better gas mileage) he took the HEI distributor out of the 350 and threw it in the 305 and it worked perfect, so your distributor should be fine. See what happens when you test the pickup coil.
__________________


"People I respect, heroes of mine would be Bobe Hope. Abraham Lincoln, definitely. Bono. Uh, and probably
God would be the fourth one. I just think all those people really helped the world in so many ways." -Michael Scott
Reply With Quote
  #6  
Old 09-16-2009, 04:05 PM
CF Junior Member
 
Join Date: Sep 2009
Location: Arapahoe, NC
Posts: 30
Default

Honestly I've never tested one. If everything else checks good, I just throw one in there. Here are the directions on how to check though.
To test the pick-up coil, first disconnect the white and green module leads. Set the ohmmeter on the high scale and connect it between a ground and either the white or green lead. Any resistance measurement less than [COLOR=green !important][COLOR=green !important]infinity[/COLOR][/COLOR] requires replacement of the pick-up coil.
Pick-up coil continuity is tested by connecting the ohmmeter (on low range) between the white and green leads. Normal resistance is between 500 and 1500 ohms. Move the vacuum advance arm while performing this test. This will detect any break in coil continuity. Such a condition can cause intermittent misfiring. Replace the pick-up coil if the reading is outside the specified limits
__________________
'97 Suburban K1500, 4.10 gears

'97 Nissan Sentra, GSE

'96 Dodge 3500, 4X2, 5.9 Cummins, highflow exhaust, valve body tweaked, KDP killed, boost-pyro-trans temp on A-pillar

'92 Starcraft 25' TT
Reply With Quote
  #7  
Old 09-20-2009, 01:02 AM
CF Beginner
 
Join Date: Sep 2009
Posts: 5
Default

Hey thanks for your help guys. I will try testing the pick up coil.
Reply With Quote
  #8  
Old 03-12-2011, 01:04 AM
CF Beginner
 
Join Date: Feb 2010
Posts: 19
Default

sounds like another victim of the VATS anti theft system. Try to crank it and look at your instrument panel. See if the security light comes on. That would be the anti theft system. Those cars are pretty bad for the connections in the ignition cylinder wearing out after a lot of use. Basically the resistor value in the key has to match up with the value required by the system to start the car. Sometimes the contacts in the ignition cylinder become worn out and an incorrect reading of the resistance is sent. Incorrect resistance = no crank.








Last edited by archebald23; 02-28-2013 at 08:23 PM.
Reply With Quote
Old 03-12-2011, 01:04 AM
 
 
 
Reply

Tags
305, 85, 97, astro, chev, chevy, coil, control, distributor, location, module, pickup, replace, s10, spark, testing, truck


Thread Tools

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On


Join Chevroletforum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 09:21 PM.

Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.

Emails Backup