94 grand am stalling problems

first timer here so please bear with me .....
I have a 94 grand am Quad 4 that i swapped in a 93 quad 4 motor i had to use the orignal wire harness as the wiring was different as well as the air cleaner and a few other things the car starts and runs fine but when i drove it about ten miles it started to run a little rough and then when i stopped it would stall , it starts right up but when put in drive or reverse it stalls and will not move . it is not overheating but after it sits for about ahour it will start up and move fine with out stalling i had a check engine light but was not able to get the codes read because i do not have a scan tool i just glanced through the forums and was wondering if this could be a map sensor or a tss sensor any help would be appreciated

Welcome mgdguy. Sure sounds like the trans. sensor(Tss or what everthe acronym is). The MAP has more to do with the intake pressure measurments to ratio the proper air/fuel mix.
And good job on the engine swap. dont always get things to run right off. takes time, and patients which most people dont hav. Hope this helps.

Did you change the ecm? Alot of the sensors are different from 93 to 94, that could be causing the problem. Some of the temp sensors have different ranges, as well as some of the pressure sensors. Hope this helps.

thanx guys i think ill try the ecm first and hope that cures the problem it sure sounds a lot easier than the trans sensor if thats the problem especialy since i got the whole doner car still .does anyone kno if theres a way to test the trans shift sensor without replacing it ??I really dont want to pull the trans out to replace it just to find out thats not it . but ...... if thats what i gotta do then so be it

yes mgdguy , a dealer or trany shop can check for trouble codes in the PCM.

Did you change the ecm? Alot of the sensors are different from 93 to 94, that could be causing the problem. Some of the temp sensors have different ranges, as well as some of the pressure sensors. Hope this helps.

Hmmmm you have me wondering now ... when i put the 93 motor in the 94 i had to use the orignal engine wire harness from the 94 because they were different then i had to use the map sensor ,neutral saftey switch from the 94 because they were different plugs can i change the sensors instead of the ecm and if so do they all need changed or just the ones with different plugs all the other sensors look the same and have same plugs
also i tried the ecm from the 93 and the temp light came on as soon as the car is started so i put orignal ecm back in
if this is alright i think my next move is to get the trans shift sensor tested and replace because i talked to a couple different people and they said it sounds like trans sensor . possible this different from 93 to 94 i did use 93 trans also ?????

Search at the parts stores online and check part numbers for the components between 93 and 94. I know a few of them are different, that might be what is causing your problem. If the part numbers are different, use the parts from the 94 motor if you are using the 94 ecm.

the 93 motor/trans will need all the 93 electronics(ecm,pcm,tcm) for it to run properly. XI

Which also means changing the engine and dash harness, instrument cluster (possibly, don't know if they are different), and ecm.

I know some sensors from the 94' should fit the fixtures on the 93' engine. this might keep you from replacing all the wiring harness and ecm, pcm. I put a 95' 3.3 from a olds cutlas cutlass ciera in a 93' GA which had the 3.3. i took all the peices, temp sensor, oil pres.,TPS, all the sensors from the 93' 3.3. It ran fine without any wiring harness's or pcm,ecm. THis may not be doable on the 4cylinder or the years you are working with.Either way it involves alot of trial and error. XI

As long as the motor is the same ie dohc or sohc then swapping the sensors will work. The major difference between the 2 years is in 1993 the thermostat was right behind the water outlet, and in 1994 the thermostat was on the back of the motor near the water pump. Check your heater hose routing make sure there is no restriction because if there is you will have an overheating problem (learned this from experience). The engine block is the same, the head is slightly different due to the thermostat location. If its a dohc motor make sure the engine id is the same, check the vin#.

both motors are sohc ,same vin #and all sensor connections are the same except for map sensor and neutral saftey switch , i think ill start by checking codes and changing sensors and put the tcc sensor in since thats major problem right now ,and the car seems to run fine till warm up (original problem) also 94 has airbag in steering colum and 93 no airbag thats main reason i didnt want to change wireharness and dash panel because then i would have to get in to changing airbag modules and sensors along with steering colum also for the record it just so happens this was the time they changed from R-12 to R-134 for the AC system so everything for ac system needs to be changed for ac to work because all the fittings are different on the compresser ,condenser, and the lines etc

just thought i would let you know i talked to a mechanic friend of mine and he said an easy test to tell if the tss selinoid (trans sensor ) is bad is to disconnect the square blue plug for the selinoid on the front of the transmission if the car dosnt stall when warm and in drive thats your problem bingo that was the problem my car runs fine now , put almost 300 miles on it already , thanks for the help guys