ZR-1 Net Registry Forums - View Single Post - 91 ZR-1 Cutting Out Under Load

03-17-2009

Quote:

Originally Posted by GregCrowe

I may not be doing this right so please correct me if I'm not but I measured the resistance on the stock coils at the 2 spark plug wire terminals. This is what I got:

1. 5.71 k-ohms
2. 5.61 k-ohms
3. no reading
4. no reading

Then I did the Summit/Accel coils:

1. 7.18 k-ohms
2. 7.24 k-ohms
3. 7.20 k-ohms
4. 7.26 k-ohms

Jeff, what does this mean to you ?

Connect the ohmmeter leads across the ignition coil primary terminals, and compare the primary resistance reading to specifications (GM asks for .35 - 1.45 OHMS). Then connect the ohmmeter leads across the coil secondary terminals and compare the secondary resistance reading to specifications (GM asks for 5,000-6,500 ohms).

Any replacement coil must be within the spec of the primary terminal.

GM does call out two different DIS coils. D545 and D555. The D545 is what they consider a replacement in the LT5. I would suspect that the aftermarket does make coils that are all inclusive. Check the primary readings and let us know what you find.