98Blubrd

iTrader: (13)

I currently have a 1998 Trans am with the mods in the sig and currently has 91K on the clock. I am about to get a 1999 Motor with 25K miles for dirt cheap. I am wondering if all the wiring to the motor is all the same. I know the 98's have a different computer but are the connections to the motor all the same? I am just wondering if its going to be a straight swap or if I will need a new wiring harness or something.

HumpinSS

iTrader: (1)

Nope you will need a different harness. some of the senosrs and their pin locations changed from 98 to 99

horist

also some of the items in your gauge cluster (such as fuel level and temp?) may not work w/the conversion ... may be better off putting the 98 sensors in the 99 motor and stay running your 98 PCM

slow

iTrader: (7)

or you could simply just change the ECT sensor to the 1998 unit, and use the 1998 knock sensor wiring harness (if it is different than the 99 unit)

Install the 1998 injectors, and be done.

ryan

98Blubrd

iTrader: (13)

I would like to stick with the 98 computer since it would save a lot of hassle. If I stick with my computer what would be needed? Just reuse some sensors from my 98? I could probably get the 99 computer for next to nothing to If that would be easier. My friend works at a salvage yard and they just got a totalled 99 thats why I am getting such a deal.

SmokingWS6

iTrader: (1)

word. also swap over the crank sensor, i believe its different. this is a much easier solution than to swap harnesses, computers, guage clusters ect.

98Blubrd

iTrader: (13)

Any other input you guys can give me.

98Blubrd

iTrader: (13)

There has to be someone else who has done a swap like this. Does anyone else have any more help?

SmokingWS6

iTrader: (1)

Swap all the different sensors over to 98's and it'll drop right in.

Red Heartbeat

iTrader: (9)

i had a 98 motor and I hooked up a 2000 harness and PCM to it and the stock sensors and the motor ran great. All I had to swap out was the ECT sensor to complete the swap. I double checked all the sensor PNs and the were the same except the ECT.