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· YOTA Master
'93 2wd P/U
2,446 Posts
check the resistance values. at some point around that year they went from low resistance injectors that used an external resistor to high resistance ones that did not.

If you use the low resistance ones in a vehicle that is setup for high resistance ones you will be buying a new ECM in short order.

I don't have info immediately available for trucks older than 1990 or I would be able to give you a more definitive anwer
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