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280 swap no spark


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Alright guys im having a really tough time getting spark, ive checked and double checked every ground and every splice for the cause but still nothing. The car is a 76 280 and the motor is the l28et out of an 81. It was running untill i went around and redid the wiring the right way. Could it be the ECU? the little green light is on so i know its getting power but the coil isnt sending spark to the plugs.

Any ideas? Thanks

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If the coil is getting power at the terminals, you can test for spark with a ground wire on the negative post. If it sparks, then figure out why the ignitor is not igniting, either it's not getting a signal from the ECU or it's broken.

 

The 81 FSM has test procedures for the 81 turbo components also if you're not really sure how the spark is created.

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Did it work before the HEI swap (probably not, I assume)? How did you do the HEI swap, if you're working with an 81 turbo ECU in a 76 car? Did you use skittle's instructions from zcar.com?

 

Have you used a volt/ohm meter on anything yet? That's what you want to start doing. Then you'll know. A couple of simple measurements will tell you a lot. You can get a cheap meter for $6 at Harbor Freight, if you don't have one.

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  • 1 month later...

I have the same spark problem. It turn on when I did the first start and then I cleaned up the wires ruling them

Under the fuel rail n connecting the maf n doing the intercooler pluming and no spark. I also have the HEI on mine.

With my 81 l28et swap on my 75 280z.

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