Blowing Ignition Modules

BLACK92TY

It's never enough
Just blew a new one. Just replaced it about a week ago.

Before I'd replace them every year and a half or so.

What could this be from? A short? Coming from where?

Thanks
 

JAY

Donating Member
Re: Blowing Ignition Modules

Isn't the factory ground going to the ECM inadequate to start with??
 

sly dvl

Ya, it's got a Turbo
Re: Blowing Ignition Modules

I;d be checking your ignition coil. Your module is just a switch that turns on and off your coil. If the resistance in your coil is too low pulling too many amps through your mod. can damage it.
 

BLACK92TY

It's never enough
Re: Blowing Ignition Modules

If this were a coil issue. I guess that would mean I'm burning through coils every year and a half or so. So to track footsteps what would cause a coil to take a dump?
 

sly dvl

Ya, it's got a Turbo
Re: Blowing Ignition Modules

Are we talking about a stock setup here, or an upgraded ignition system?
 

BLACK92TY

It's never enough
Re: Blowing Ignition Modules

Stock setup.

Yesterday I went and got an MSD coil (a little heavier duty than the cheap factory coil) as well as a pickup coil while we're at it. Might as well. I also got a ground wire with dual eyelits so we can rework a stronger ground, maybe to the frame I'm thinking. The module has z lifetime warranty so I'm pulling that off and returning it today for a new one.

I'm not blowing fuses or anything like that.

I did a search the other day and found a guy posted this:

My old Ty had this problem. I finally ended up pulling the distributor and found the cam gear was worn bad...almost razor sharp....replaced gear and all was fine.

I'm hoping its not the distributor. We will see. Thanks for all the feedback.
 

SloGN

9Sec Alky V6
Re: Blowing Ignition Modules

From what i have seen is as stupid as it sounds a bad feul pump relay. The dist is wired in a way that it will turn on the fuel pump if the relay fails ans a secondary power source to the fuel pump.

I had this happen on my 91 z28 when the fuel pump failed/shorted out it killed the dist as well.

does the truck have a long crank over time before it fires? if so it may mean the relay is bad and the pump is not priming until the engine is turning over.


i know it sounds crazy but something to look for. also have you been getting a code 54?

Have you been using a decent brand of modules. are you using the supplied heat sink grease?

HTH

Patrick
 

BLACK92TY

It's never enough
Re: Blowing Ignition Modules

From what i have seen is as stupid as it sounds a bad feul pump relay. The dist is wired in a way that it will turn on the fuel pump if the relay fails ans a secondary power source to the fuel pump.

I had this happen on my 91 z28 when the fuel pump failed/shorted out it killed the dist as well.

does the truck have a long crank over time before it fires? if so it may mean the relay is bad and the pump is not priming until the engine is turning over.


i know it sounds crazy but something to look for. also have you been getting a code 54?

Have you been using a decent brand of modules. are you using the supplied heat sink grease?

HTH

Patrick

It starts normal...When it starts. No long crank over times.

The brands we have been using have been the heavier duty kind. Since I've had problems with the modules in the past, I've discontinued buying the cheap factory kind. Yes we are using the supplied grease.
 

sly dvl

Ya, it's got a Turbo
Re: Blowing Ignition Modules

I would check the resistance on both the primary and secondary sides of your coil. Plugs and wires with too much resistance can also overwork the coil resulting in ignition module failure.
 

BLACK92TY

It's never enough
Re: Blowing Ignition Modules

Well I think we found the culprit.

Pulled the distributor and the teeth are pretty well chewed. We'll put a new one in today and while were at it try and re-work some more solid grounds.
 

MICH TY

Donating Member
Re: Blowing Ignition Modules

Glad you found the problem,. Thanks for sharing what you found.
Was this the original dist and gear? How many miles on it? This might be good for us to know for future diagnosis.

Thanks.
 

sly dvl

Ya, it's got a Turbo
Re: Blowing Ignition Modules

I still don't see how a worn distributor gear is going to take out an ignition module. Am I missing something here?
 

BLACK92TY

It's never enough
Re: Blowing Ignition Modules

Yeah you make a good point. I'll tear it back apart and put the old gear in. What was I thinking?
 

sly dvl

Ya, it's got a Turbo
Re: Blowing Ignition Modules

Yeah you make a good point. I'll tear it back apart and put the old gear in. What was I thinking?

My point was NOT that your distributor gear didn't need replacing, but rather how is a worn mechanical part going to take out an electrical part. However, you seem to be satisfied with your repair...
 

RealFastV6

@jb_and_his_coffee
Re: Blowing Ignition Modules

Yeah you make a good point. I'll tear it back apart and put the old gear in. What was I thinking?

:rotf:

You missed his point completely, but at least you're funny.

What kind of distributor and what cam? (Stock \ Comp ?)
 

BLACK92TY

It's never enough
Re: Blowing Ignition Modules

:rotf:

You missed his point completely, but at least you're funny.

What kind of distributor and what cam? (Stock \ Comp ?)

I was being sarcastic. I think he might have missed my point that it wasn't just the gear that we replaced. Not sure on the distributor. We've never replaced it since we've owned it. Looked at it when we had the motor apart a few years back when we did the rebuild and it seemed fine then. The cam we are running is a custom ground cam. I believe Hood did it a few years back. I'd have to go back and look at the specs on the cam card.

Truck pulls good with zero break-up. Went down to Car Craft over the weekend and saw a couple other Tys. No Syclones down there. But it was fun.
 
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