POS wont start now

SY2932

SY2932

Administrator
Re: POS wont start now

If you definitely have both spark and fuel pressure, your ignition module is dead. A bad ignition module won't generate a reference pulse preventing the injectors from firing. Part number is 1048-2827 (located under your distributor cap, BTW).
 
turbodig

turbodig

Active member
Re: POS wont start now

If you have a scan tool, check to see if it's getting DRPs (reference pulses). If it isn't, it's a bad module.

Dig
 
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1SLOSUV

New member
Re: POS wont start now

i was thinking about the ICM on my 72 camaro with HEI.same kinda situation ended up being a pain in the butt. but i am on a very very very tight budget with this truck now and pickens are getting slim. any other ideas before spending the money on the ICM?
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Don W.

Don W.

Stab it and steer it
Re: POS wont start now

No hijack but related question. Does an ign module either work or not work, or is there an in-between, lets drive the owner nuts, mode?
 
etriebe

etriebe

New member
Re: POS wont start now

have you tried a noid light yet? If the light doesn't blink when cranking pretty sure it's an ignition module. if your pick up was bad you wouldnt get spark either :2cents:
 
SY2932

SY2932

Administrator
Re: POS wont start now

You don't need a noid to check to see if the injectors are getting a reference pulse or not, a simple test light will work as well. The brightness of the light doesn't matter so long as it lights.

In my experience once an ignition module goes bad, it stays that way. There is no sometimes it works, sometimes it don't. Like any other electronic device, it is prone to acting up if it gets too hot. Given it's location and condition of the heat sink grease that helps to keep it cool it could cause issues if the truck is hot vs. cold.
 
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11secty

New member
Re: POS wont start now

1SLOSUV said:
so it started 2 days ago now nothing has fuel pressure at rails and fire at coil. why wont it start. it turns over and over and over with no fire and no luck what is the problem
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just cause you havefuel at the rail dont mean the injectors are firing it in .... and if you have spark... sray some starting fluid inthe throttle body with it open
 
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