like the title says, will a 98 pcm and harness work on an 01 ls1?

No, re-pin it for the 1999-02.

well i just got off the phone with speartech,

they said if i use a 98 pcm with a 98 harness, i should be okay.

just wanted to see what everyone thought

It will work, just be aware the 97-98 PCM is the ugly duckling of the LSx PCMs

Id repin it for the 99-02 if I were you

I'm using 98 PCM and harness with a complete zo6 top end and cam. Been running strong for 2yrs. If it's what you have on hand to work with there's no need to worry.

alright cool, thanks.

ron is sendin me up the 98 pcm, so I guess when i see it i'll make my decision. if it works though, than i'm prob gunna stay with it.

i thought the 98 pcm had different connectors though, or is it just different pin designations?

It can work just fine.
Remember to have the computer reprogrammed for the different injector size though. '01's are 28lb, 98 was 24lb.

oh okay.

on a side note... it has the ls6 manifold on it, does that mean it has to use ls6 injectors or are they still the ls1? too early in the am to look, but since u mentioned it i thought id ask

If its an ls6 mani it should have the 28lb inj unless someone switched them out.

98 was also 28lb. 99-00 was 26lb and then 01-02 went back to 28lb. Im pretty sure thats how it went.

anyway to tell? physical differences or no.

I wasn't 100% sure, but I know they change.
If you are using HP tuners, could just download a stock 98 file from their website and compare it to an 01 file to make the changes.

Look up the part number

not worried about buyin new, just wanted to know what ones i currently have so my pcm can be programmed correctly.