DS4 vs ECU

[6.5L]

I thought at one point you can't change ECU between years or was that pumps? I got a customer with a 94 6.5L, IP is bad, he is looking for cheap temp fix, and found a guy selling a few spare used DS4's. One is from a 94, the others are 96-98ish I think. I am checking to try to get the 94 pump (I know 94 was a funky year) but can it be a straight swap of just IP? Or is there something I need to get with it? Not fancy with the DS4 electronic crap

 

[ak diesel driver]

As long as it's not the 5068 IP any of the IPs will work. ECUs don't interchange much. Usually only the HDs got the 5068 in 94.

 

[6.5L]

The guy has a 5068 and some 5521's. Why can't the IP's interchange as long as the ECU isn't changed?

 

[ak diesel driver]

the 5068 uses it own special ECM. you need to find out what ECM is in the truck

 

[6.5L]

Ok cool, thanks!

 

[WarWagon]

Isn't it just a eeprom chip change for the oddball IP same ECU? Needs to be a 1994 chip for the trans, but, some people can burn any chip you like.

 

[THEFERMANATOR]

For 94 it isn't the ECM, but the EPROM chip that's different. ALL 94's got one ECM, and all 95's got another(although they do interchange with each other so nobidy knows why 2 different part numbers). If the truck has a 5068 on it, then you must go back with a 5068 OR change the EPROM aplicably.

 

[6.5L]

So the truck has a DS4-5459 in it actually, which from some stuff I found online is an old pump from a 1999 year model truck. So being a 1999 pump in a 1994 truck, and everything seemed to be working up until this point, can I assume if I get a DS4-55221 from a 2000 that it will go in just fine?

 

[ak diesel driver]

I would

 

[THEFERMANATOR]

If GM did the pump under warranty, then it most likely got the updated PROM from GM to run the newer style pump. Sounds like your good to go.