Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power Windows
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy

Username Post: wiring/no spark issues        (Topic#345416)
mynew72 
Forum Newbie
Posts: 2

Reg: 06-13-17
06-13-17 04:44 PM - Post#2695845    

i have a 2010 350 crate motor in my 72 chevy. it has new comp cams, new distributor, new coil,new rotor and i have no sprk. please advice!! also this site rocks you guys are really knowledgeable and supportive. my girlfriend just bought a kia and the motor blew..guess what no kia forums except how aweful they are



 
bobschevytrucks.com Ecklers LMC Trucks

Bad Bowtie 
Valued Contributor
Posts: 4785
Bad Bowtie
Age: 45
Loc: TX
Reg: 07-04-03
06-15-17 11:17 AM - Post#2696041    
    In response to mynew72

Isn't there a module you have to buy/add to fire the LS ignition system/coils?

I know there is if you are staying EFI & the PCM has to be reprogrammed to remove the anti-theft passlock key system...


GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
LUVmachine 
Frequent Contributor
Posts: 1453

Age: 36
Loc: Redding Ca
Reg: 10-02-14
06-15-17 03:09 PM - Post#2696068    
    In response to Bad Bowtie

I am assuming it's a standard 350 with a carb. Run a #10 wire to the b+ terminal on the distributor to the fuse box terminal labeled ign (if memory serves me correctly).

The factory wiring is not setup for a HEI and depending on who has had their hands in it over the years you might be tied into it where you are not getting the full 12-14 volts. Start with the basics and verify the spark is actually the problem.

71 Chevelle BBC powered
71 C-10 454 with weiand 177 (SOLD)
72 406 sbc powered Chevy LUV sleeper (SOLD)
2010 GMC Sierra crew cab 4X4
http://s626.photobucket.com/user/GJohnson81/libra r...


 
mynew72 
Forum Newbie
Posts: 2

Reg: 06-13-17
06-19-17 02:41 PM - Post#2696604    
    In response to LUVmachine

i am also having this problem on a 72 chevy 350. i pit the old distributor on the benh vice and hooked up the battery. everything works fine on the bench.i re installed in the truck and no spark. i rewired just like you said bat+ to fuse box and yet nothing. i even went as far as to chnge the ignition swith thinking maybe it went bad and wast send signal to coil. i am officially stumped!



 
JimKshortstep4x4 
Chevytalk Moderator & "14th Year" Silver Supporting Member
Posts: 5062
JimKshortstep4x4
Loc: Muskegon, MI, USA
Reg: 03-28-02
06-19-17 04:23 PM - Post#2696632    
    In response to mynew72

Welcome to Chevy Talk from West Michigan!

I am not clear on how you are testing a distributor on the bench. Also, do you have a full 12 volts at the distributor with the key on? Hooking up the distributor as suggested should give you full 12 volts at the distributor.

Good luck,

Jim



65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/TH 350
71 Snow plow, 4x4, 350, TH 350
72 GMC Shortbed, stepside, 427/TH 400


 
raycow 
Honored Member
Posts: 27078
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-19-17 08:06 PM - Post#2696667    
    In response to JimKshortstep4x4

It would be easy enough to test a points-type distributor off the engine if you are electrically competent. An electronic dist would be a whole other story.

The OP said he tested the "old" dist, so I assume it had points. He didn't say exactly HOW he tested it though. IMO, the best plan of action would be to ask him.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
JimKshortstep4x4 
Chevytalk Moderator & "14th Year" Silver Supporting Member
Posts: 5062
JimKshortstep4x4
Loc: Muskegon, MI, USA
Reg: 03-28-02
06-20-17 11:07 AM - Post#2696775    
    In response to raycow

I am familiar with using an ohm meter to test electrical components but my preference is to test distributors, (points or HEI) with my distributor machine up to 5,000 rpm with it actually firing.

Jim

Attachment: P5260001.JPG (657.97 KB) 9 View(s)




65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/TH 350
71 Snow plow, 4x4, 350, TH 350
72 GMC Shortbed, stepside, 427/TH 400


 
LUVmachine 
Frequent Contributor
Posts: 1453

Age: 36
Loc: Redding Ca
Reg: 10-02-14
06-20-17 11:18 AM - Post#2696776    
    In response to JimKshortstep4x4

To the op just to be clear. I assume it was an HEI distributor. Most car and truck guys will almost always have a spare module laying around somewhere. If you can find an extra module try swapping it out and see if that cures the problem. Don't forget the heat sink compound or it will burn up.

My next suggestion is to try another coil and don't forget to put the ground strap back in.

This might be a stupid question but is there any chance you could have the battery wire on the tach terminal? Also did you verify with a test light or meter that the terminal you tied onto in the fuse panel was actually hot with the key in the run and start position?

71 Chevelle BBC powered
71 C-10 454 with weiand 177 (SOLD)
72 406 sbc powered Chevy LUV sleeper (SOLD)
2010 GMC Sierra crew cab 4X4
http://s626.photobucket.com/user/GJohnson81/libra r...


 
bobschevytrucks.com Ecklers LMC Trucks

Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

561 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.444 seconds.   Total Queries: 14   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:56 PM
Top