truck runs for 30 sec then dies help!!!!!!

[lilhupper]

were does it go one side goes to tach were is the other? if i put it to the est wire it runs great

[jim_in_dorris]

reference_signals.png
The tach wire goes from the tach in the dash to the coil. The est wire should be hooked up as shown. You do not need the tach wire connected for the truck to run. Most trucks didn't come with a tach.

[lilhupper]

ok new questions iplug in the ignore mod bypass and truck dies. when un plugged at full throttle it starts loading up

[lilhupper]

truck runs good with the bypass wire unplugged when plugged in it retards the timing off the scale. could it be because i dont have a esc mod hooked up?

[EagleMark]

You've got some strange issues going on? What is this vehicle, transplant, hybrid, swap ?

You never answered this? I have no idea what motor this system is on? Only clue I have is a picture that looks like a Jeep, no engine?

I have run these systems with no ESC or knock sensor and timing works fine.

What distributor? What engine? Pugging in the bypass wire and having timing go backwards happens a lot in reverse rotation distributors and DurSpark conversion, the 2 wires from pickup coil need to be reversed.

[lilhupper]

its a 75 vet motor lunati voodoo cam #10120701LK 487x head holley street dominator intake distributor RPT #GM04 its goin in a 92 s10

[EagleMark]

Back to a wiring issue, bad EST/ICM in distributor or... should not be wrong.... the wires on pickup coil in distributor are crossed.

That's going to be a lot of fun to drive when tuned!

[lilhupper]

yeah if i can get it running right. if the pick up wires are crossed could it wreck the EST? btw thanks for all the help this is my first engine swap.

[lilhupper]

and i found a problem on one of those working diagrams. for the est mod the pigtail goes a.b.c.d on the diagram it goes a.b.d.c

[EagleMark]

yeah if i can get it running right. if the pick up wires are crossed could it wreck the EST? btw thanks for all the help this is my first engine swap.

No, I've had them brought over to shop cause they don't run, swaped wires and they ran fine. Not saying this is your issue!

and i found a problem on one of those working diagrams. for the est mod the pigtail goes a.b.c.d on the diagram it goes a.b.d.c

Which one?

[lilhupper]

distributor reference hi and est wires are different
1227747--1.jpg1227747--2.gif

[EagleMark]

C, D, B, A on one and A, B, C, D on the other. But the wires all go from and to same place. One is more accurate to how the EST is laid out.

Go by the pin letters on plug. Which are like this diagram.
http://www.gearhead-efi.com/Fuel-Inj...0&d=1331599707

[lilhupper]

ok thats how i have it now tested my icm and it was bad also found out were the pick up coil wires go. switching them will that throw off my base timing as it sits now?

[EagleMark]

Yes, if they are backwards (which they should not be on stock distributor in chevy engine) then base timing would need to be reset.

[lilhupper]

we did switch the ign mod before for my other problem didnt know if it would work or not but my brother put it back together and didnt know witch wire went where