Cadillac Repair: 89 caddy deville, port fuel injection, manifold system

Question
i have recently installed a 1990 dville moter in my 89 dville ....idles ok then when put in gear ...no power...runs like shit.....some one says u have to reset computer...how do u do this....

Answer
Hi Joe,

     Depending on what you did to retrofit the engine the problem just might be the computor itself and the prom. The reason being that the '89 engine was set up for throttlebody injection where as the '90 has port fuel injection. Or 2 injectors versus 8 and that is confuseing the computor on how much fuel to use.

     The way I see it you eithor need to install the '89 intake manifold system on the '90 provided all the ports line up or change the ECM and prom from a '90 model and then make the wireing work. Bill