12200411 PCM swap for 1996 to 2000 GMT400 trucks

[Christian Steffen]

Message him on this forum with your email address and truck year, engine, and transmission. He sent me a sheet for my truck about 2 weeks ago.

or ls1trucks.com

 

[John Cunningham]

On this coil on plug change. I was a hard core drag racer and still keep up with the latest trends........none of them have cop on their engines.

Crank trigger and a MSD box and one coil on the NA engines.

On the big turbo engines they are using mags

 

[AK49BWL]

Can also command more than ~45* of timing is you want/need to. Probably not all that useful but you no longer have that physical limitation.

I would find that very useful. I know my truck will do more than 38 degrees at 65mph cruising at low throttle without knocking, but any advance above 37-38, and it starts firing into the wrong cylinder. My Blazer 4.3 runs 39s, up to 42 even, at cruise without crossfiring so I know it's possible. My higher-advance spark table made a notable difference in the Blazer's highway mileage too. I can't wait to rebuild my Sierra 350 so I can do the COP mod. I already have most of the hardware laid out, and a tune file to match it lol.

 

[Douglas1300]

is anybody on here using hp tuners and willing to look over my tune for the 0411 swap? I have a 1999 K1500 suburban with a GMPP HT383E engine. I did the swap and double checked all the wiring and the truck wont start. I think it has to be either a problem with the tune or a hardware issue either with the pcm or something on the truck that happened during the swap. I have no spark at all. the truck ran with the black box, but it wont even think about starting after swap. I cant figure out what im over looking. if anybody is willing to help me out, I'll email you my file. thanks.

 

[PlayingWithTBI]

If you don't get any replies, try gearhead EFI forum. Most of the folks there use TunerPro RT but there are others that use HPT also.

 

[eshaw]

Did you remove VATS?

 

[Douglas1300]

I changed Vats from serial to none, but I don't know if I can disable it any more than that.

 

[AK49BWL]

That should do to shut VATS off, but iirc the 0411 VATS disables fuel, not spark.. so I don't think VATS is the problem. I can look over your file, will send PM with my email. Do you get fuel to the engine at all? If not, I'd look into the crank sensor wiring too - barring the ICM or coil failing (or the 0411 or tune of course), I can't think of anything else that would keep you from getting spark at all.

 

[Christian Steffen]

is anybody on here using hp tuners and willing to look over my tune for the 0411 swap? I have a 1999 K1500 suburban with a GMPP HT383E engine. I did the swap and double checked all the wiring and the truck wont start. I think it has to be either a problem with the tune or a hardware issue either with the pcm or something on the truck that happened during the swap. I have no spark at all. the truck ran with the black box, but it wont even think about starting after swap. I cant figure out what im over looking. if anybody is willing to help me out, I'll email you my file. thanks.

I can check it out. [email protected]

 

[Douglas1300]

i'm getting fuel. I was thinking icm failure. my coil is new. I just need to test the icm to verify that's it. I hate throwing parts at problems.