HEI Help

[moranda]

Hello All. I have done a fresh rebuild on my AMC 258 i6 / 4.2l and now am trying to get it started up. I have added a Howell TBI kit and a HEI by DUI. When i try to start the jeep it cranks over but never fires up. I am getting fuel to the tbi and timing is right. I am thinking that it could be the HEI because on cranking i am getting 9.5V. I believe that HEI needs a minimum of 10.5V. If this is the case how would I get more cranking voltage?

 

[jp360cj]

How is the HEI wired in? Typically it should get the full 12V

 

[gert]

If you have a ballast resister you need to bypass it


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[moranda]

I have removed all the duraspark wiring and ran 12 gauge wire over to the HEI. I have attached a picture that shows the connection the red with white stripe was hot going into the duraspark ignition, the black wire goes to the HEI and the orange powers the Howell computer.

 

[jp360cj]

sounds like you picked up the regular "run" wire for the Duraspark that is coming from the resistor wire. If the voltage on that wire is less than 12V, then you need to pick up 12V switched from somewhere else.

 

[Torxhead]

A good source of power for start up is the "I" terminal off the starter relay, This wire normally goes to the positive side of the coil anyway. This provides a direct connection from the battery. Here is a wiring diagram:
https://www.bing.com/images/search?...p+cj&selectedindex=39&ajaxhist=0&vt=0&eim=2,6

 

[RiverandSand]

Pull a plug and check for spark, should be blueish in color, if yellow it's weak.
X2 on full 12 volts to the HEI. Run a jumper from the battery to the HEI and see if it will start. Don't leave it on to long as it can burn out the coil pack if the engine doesn't start.

 

[moranda]

In the run postion i do get 12v at the hei. It is during cranking i am seeing 9.5v. I see this at both the distributor and the battery though. Should i be dropping this many volts at the battery?

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[Torxhead]

The two big drains for the battery would be the electric fuel pump and the starter.

 

[Posi]

In the run postion i do get 12v at the hei. It is during cranking i am seeing 9.5v. I see this at both the distributor and the battery though. Should i be dropping this many volts at the battery?

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9.5v is nothing unusual during cranking only. Anything lower then 9.5 should be investigated.