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Pontiac 400 w/HEI .... timing light will flash once .... new…

Customer Question
Pontiac 400 w/HEI ......

Pontiac 400 w/HEI .... timing light will flash once .... new module, cap, rotor, coil , pickup coil .... 13.0 volts to dist

Mechanic's Assistant: Just to clarify, can you tell me which light it is? And does it blink first, then stay on steady?

Timing light ... to verify spark

Mechanic's Assistant: What is the model/year of your Pontiac?

Not sure , customer brought us a motor to dyno

Mechanic's Assistant: What year is your Pontiac?

Maybe 75 ... aren't all HEI's the same ?

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

This is a motor on a dyno .... i'm not an ametuer ....i've been dynoing for 40 years ... this one stumps me ... i've replaced eevery part in the dist .... someone said pontiacs and Olds may have reverse polarity ? ....

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That's it

Submitted: 1 month ago.Category: Pontiac
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Customer reply replied 1 month ago
i've also had this distributer on our dist machine .... one flash , that's it
Answered in 15 minutes by:
3/16/2018
Pontiac Mechanic: kwiggins29059, ASE Certified Technician replied 1 month ago
kwiggins29059
kwiggins29059, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 3,386
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Verified

Hello, is there much play in the shaft? This could be causing the reluctor not to work properly with the pick up coil.

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Customer reply replied 1 month ago
no
Customer reply replied 1 month ago
080 verticle .... the usual
Pontiac Mechanic: kwiggins29059, ASE Certified Technician replied 1 month ago

Thanks, ***** ***** units were the same from 74-80 and used the 4 pin module for non computer controlled. You might want to double check that. OTherwise I have a helpful link HERE for testing. I was going to say possible ground issue in car but with it doing the same on your tester it's going to be something deeper. It looks like you've replaced all the parts and with the normal play in the shaft it's got to be something small that's getting overlooked.

My goal is to provide 5 star service. Rating/accepting does not cost extra and ensures I'm credited for my time and knowledge. It also does not close your question if you have a follow up concerning this. Thank you for using Just Answer!

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Customer reply replied 1 month ago
hello ... are you there ?
Pontiac Mechanic: kwiggins29059, ASE Certified Technician replied 1 month ago

I replied before your last post if it didn't show up let me know

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Customer reply replied 1 month ago
i've ohmed everything
Customer reply replied 1 month ago
do i get my money back if you can't answer me ?
Pontiac Mechanic: kwiggins29059, ASE Certified Technician replied 1 month ago

Thanks for the additional info, when ohming the pickup coil did you move the vacuum advance plate to see if it changed?

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Customer reply replied 1 month ago
also ohmed another new one
Pontiac Mechanic: kwiggins29059, ASE Certified Technician replied 1 month ago

There's a 100% satisfaction guarantee. I am unable to offer any further advice since you have said you've ohmed and replaced all components. I will open this up incase another expert has any insight.

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Customer reply replied 1 month ago
i can't wait 24 hours
Customer reply replied 1 month ago
how do i get my refund
Customer reply replied 1 month ago
how do i process my refund ?
Customer reply replied 1 month ago
i'm also ASE certified
Customer reply replied 1 month ago
is there anyone following up with this ?
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago
Jared D
Jared D, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 2,182
Experience: Shop Supervisor at County Fleet
Verified

Good morning,

New expert here. I can submit your question to customer service for a refund or I can see if I might help out at all. Which would you like?

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Customer reply replied 1 month ago
do you think you can help ? i know this is a tough one
Customer reply replied 1 month ago
HELP
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Is this a 2 wire or 4 wire HEI?

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Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Factory GM or aftermarket?

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Customer reply replied 1 month ago
factory ...
Customer reply replied 1 month ago
4 pin module
Customer reply replied 1 month ago
pos & tach ...... 3 spades on the connector from the dist
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Let's see if maybe we can bypass the module and see if it will spark. I can't recall which is the module. Just a sec.

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Customer reply replied 1 month ago
2 coil and a grnd
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

First, you've cranked the engine with the cap off to make sure the rotor is spinning right?

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Customer reply replied 1 month ago
the dist is on our dist machine
Customer reply replied 1 month ago
to your ?
Customer reply replied 1 month ago
eng is on an eng dyno
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Oh, ok. I must have missed the part about having a test bench. I'm sorry.

So how do you have your power and grounds connected.

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Customer reply replied 1 month ago
directly to a 12 volt power source .......... 13 volts
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

I know this sounds pretty dumb, but to which terminal? Nothing hooked up to the tach terminal?

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Customer reply replied 1 month ago
bat ... nothing on tach
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Good ground to the center pin?

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Customer reply replied 1 month ago
ground right to the coil .... polished coating off the magnet
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

I'm having a hard time picturing which HEI this is. Not the electronic spark controlled version? No ground pin in the center terminal on the connector?

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Customer reply replied 1 month ago
ground pin in the center .... i bypassed the connectors
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Do you have an electric heat gun to induce voltage into the module to see if it will spark?

You've replaced the coils, module, pickup could, everything, right?

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Customer reply replied 1 month ago
everything
Customer reply replied 1 month ago
i know this is a really weird one .....
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

No kidding. At this point I would probably return it all and buy one of these:

https://www.ebay.com/itm/SBC-Chevy-Performance-HEI-Distributor-Red-Cap-Super-Coil-305-350-400-Small-Block/202199917262?hash=item2f140de2ce:g:-8sAAOSwE8daZu9m&vxp=mtr

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Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

I have one in my chevelle. 12 volts to the batt terminal and this bad boy runs like a dream.

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Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Maybe the pickup coil wires are swapped?

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Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

What color is the connector on the pickup coil?

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Customer reply replied 1 month ago
i tried the cnnectors both ways
Customer reply replied 1 month ago
pick up coil only fits one way
Customer reply replied 1 month ago
coil connectors i mean
Customer reply replied 1 month ago
biege
Customer reply replied 1 month ago
hey ... i really appreciate your time but this isn't going to work .... i need someone who's scene this before .... sorry
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

But maybe you have a chevy pickup coil in a pontiac distributor. From looking straight down on the pickup coil which side is the white wire on?

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Customer reply replied 1 month ago
left
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

They are swapped on the pontiac. The white wire is on the right and you have to flip it to connect it.

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Customer reply replied 1 month ago
reverse polarity ?
Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

I'm having a hard time picturing it. Something has to be hooked up funny. I'll opt out to see if someone else has any ideas. If not, then you can request a refund. Sometimes these can be real head scratchers when you aren't there to look at it.

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Pontiac Mechanic: Jared D, ASE Certified Technician replied 1 month ago

Also, you might take a look at this guy's test procedure:

http://www.chevelles.com/techref/ftecref5.html

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Customer reply replied 1 month ago
can i just get the refund ? i've been all over the internet
Customer reply replied 1 month ago
i know ... the online thing sucks
Customer reply replied 1 month ago
r u still there ?
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Category: Pontiac
Satisfied Customers: 2,182
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