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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: virus on March 27, 2010, 04:57:32 pm

Title: No spark 86 suburban-Fixed with new problem-
Post by: virus on March 27, 2010, 04:57:32 pm

Hey everybody I have a 86 suburban with a 350 that died on me awhile ago it just sputtered and quit. I finally got a chance to mess with it today. I pulled a spark plug and am getting no spark but the coil is good is there something in the distributor that could kill my spark? At first I thought it was the fuel pump but when I put some gas in the carb and the engine did nothing it just kept turning over is that from no spark? Thanks in advance.

Title: Re: No spark 86 suburban
Post by: VileZambonie on March 27, 2010, 05:23:15 pm

It's most likely the ignition module.

Title: Re: No spark 86 suburban
Post by: virus on March 27, 2010, 05:26:47 pm

Quote from: VileZambonie on March 27, 2010, 05:23:15 pm

It's most likely the ignition module.

Is that in the distributor?

Title: Re: No spark 86 suburban
Post by: Lt.Del on March 27, 2010, 11:39:23 pm

i just had to change my module out last week.  yes, it is a black electronic gizmo in the distributor.  Your HEI distributor looks a little different than my '91 distirbutor, but you get the idea...


http://forum.73-87chevytrucks.com/smforum/index.php?topic=15628.0

Title: Re: No spark 86 suburban
Post by: Irish_Alley on March 28, 2010, 02:53:18 am

if your coil is good then it could be the module or the pick up coil I had a pick up coil go bad on me once replaced the coil put it all back in working order, nothing so I replaced the icm still nothing then the coil was the last thing to replace and it did it

Title: Re: No spark 86 suburban
Post by: virus on March 28, 2010, 06:13:57 am

Thanks everyone I'm going to mess with it again today hopefully I get it going.

Title: Re: No spark 86 suburban
Post by: VileZambonie on March 28, 2010, 08:39:48 am

You'll find the problem more intermittent (usually worse when warm) if it's the pick up coil.

Title: Re: No spark 86 suburban -Fixed with new problem-
Post by: virus on March 28, 2010, 01:24:31 pm

I figured it out it was a stripped wire that connects to the ignition module. I taped it up and she fired right up. I was driving it around and before it will shift you have to let off of the gas a little does anyone have a clue about that?

Title: Re: No spark 86 suburban-Fixed with new problem-
Post by: VileZambonie on March 28, 2010, 02:23:32 pm

Did you knock the vacuum hose off for the modulator?

Title: Re: No spark 86 suburban-Fixed with new problem-
Post by: virus on March 28, 2010, 04:57:01 pm

Quote from: VileZambonie on March 28, 2010, 02:23:32 pm

Did you knock the vacuum hose off for the modulator?

I did see a vacuum line not connected in front of the carb alittle toward the passenger side could that be it? If not could you explain where it is.

Title: Re: No spark 86 suburban-Fixed with new problem-
Post by: VileZambonie on March 28, 2010, 07:57:20 pm

What trans do you have? The vacuum modulator is located on the rear of the trans on the pass side for the TH350 and TH400. There should be vacuum present at the modulator. Follow the hose from the modulator and make sure it's conected to manifold vacuum. If you have a 700R4 check the TV cable adjustment. It's located in the throttle bracket. If you do a search of either you'll see several how to posts.

Title: Re: No spark 86 suburban-Fixed with new problem-
Post by: virus on March 28, 2010, 09:36:36 pm

Thanks vile I appreciate it.