No spark 1994 Chevy 1500

[J romney]

Hello all, I have a 94 1500 Chevy with a 4.3v6, I was driving and truck all of a sudden died as if I turned the key off, got it towed home and have since replaced the whole distributor, ignition coils, fuel pump is new, relay and fuses are good. I have 12V on the grey connector into the coil and 12V on both pins of the black connector (unplugged from ICM and plugged into coil). Have absolutely 0 spark. The 4 pin connector into the ICM one pin has 0.9V and another has 0.6, other two have 0. Wondering if someone can give me some insight. Thanks.

 

[Schurkey]

Hello all, I have a 94 1500 Chevy with a 4.3v6, I was driving and truck all of a sudden died as if I turned the key off, got it towed home and have since replaced the whole distributor, ignition coils

Describe your "new" distributor. Did it come with an ignition module? Is it a used, rebuilt, or is it a new unit?
How many "ignition coils" does your vehicle have? I'd have expected "one".

Have absolutely 0 spark.

HOW are you testing for spark?

 

[J romney]

Describe your "new" distributor. Did it come with an ignition module? Is it a used, rebuilt, or is it a new unit?
How many "ignition coils" does your vehicle have? I'd have expected "one".


HOW are you testing for spark?

With the spark plug out and grounded

 

[J romney]

With the spark plug out and grounded

Yes it came as a full unit and only one ignition coil sorry it auto corrected

 

[Schurkey]

IF you used the spark plug, and IF it was fouled, you wouldn't see a spark.

Use a real spark tester, calibrated for HEI.

My favorite style:
www.amazon.com/dp/B003WZXAWK/?coliid=I3S98D7T1J0RLJ&colid=2VLYZKC3HBBDO&psc=1&ref_=lv_ov_lig_dp_it

xc_hide_links_from_guests_guests_error_hide_media

Test from the coil wire, not a plug wire--because if you have a faulty cap or rotor, you might not have spark at the plug wire even if you had spark at the coil wire.

At this point, you haven't proven to me that you don't have spark. You may or may not have spark...but you haven't proven it yet.

 

[AuroraGirl]

IF you used the spark plug, and IF it was fouled, you wouldn't see a spark.

Use a real spark tester, calibrated for HEI.

My favorite style:
www.amazon.com/dp/B003WZXAWK/?coliid=I3S98D7T1J0RLJ&colid=2VLYZKC3HBBDO&psc=1&ref_=lv_ov_lig_dp_it

xc_hide_links_from_guests_guests_error_hide_media

Test from the coil wire, not a plug wire--because if you have a faulty cap or rotor, you might not have spark at the plug wire even if you had spark at the coil wire.

At this point, you haven't proven to me that you don't have spark. You may or may not have spark...but you haven't proven it yet.

if one doesnt trust their eyes there is always the good ol "HOLD THIS" approach to the unknowing child.. .may not be adviseable for continued living especially if one had a pacemaker or something but if you feel vicarious there is that. althoguh i havent gotten really good at distinguishing a healthy blue spark from a ****** barely igniting yellow one based on feel. so the sensitivity setting maybe some learning curve to it.

 

[steveed]

In the sticky section there is a post called 88-95 service manuals.

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

I would download this one from the 1994 section:

9442_DRIVEABILITY_EMISSIONS_ELECTRICAL_DIAGNOSIS_MANUAL ** NEW 5/2016

On page 86 section A3 they go through the no start and basically say get a spark plug tester. If no spark go to section 6A on page 306

Section 6A really goes through testing each component, it’s easy to follow and has all the specs.

I had the same engine and same issue, at least I was driving and it died. Multiple times. It would start again after sitting a while though. My issue was the temp sensor for the ecu (there are two one for the gauge) was bad and the truck was running very rich. It would foul the plugs. I guess after a bit of sitting they would dry enough to start up again.