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View Full Version : 0411 Swap, Tach is off


chevy052500hd
August 27th, 2008, 08:20 AM
Ok I swapped my old vortec box outta my 2000 S-10 4x4. Now the tach is off, and I played with all the tach multipliers nothing has helped? The engine is 4.3L V6 too. Do I need a cluster outta a 02 to be compatiable with the new pcm?. It seems that the pcm needs to put out more pulses. The stock seting is 1 in the tach box, and increasing the number only makes it worse.

Thanks
Kurt
GMPX
August 27th, 2008, 09:35 AM
Kurt, 1 is of course the lowest it will go, if it's still not right then there is nothing you can do in the tune.

Cheers,
Ross
ChipsByAl
August 27th, 2008, 10:43 PM
Is your tach reading higher or lower than it should be?
Al
chevy052500hd
August 28th, 2008, 02:55 AM
lower, when is supposed to be 700 rpms it says 500, when it get to 1100 rpms displayed the actually rpm is 2000
chevy052500hd
August 29th, 2008, 10:04 AM
okay i hooked up my tech 2 and read the input rpm is says it is receiving, PCM rpm was 700 and deplayed input to tach was 500, it varies worse as rpms come up, I am going to swap pcm's may have a bum tach output, do the old ipc's from s10 get it's tach info from class 2 or tach input.

everything else works great fuel temp speedo.

Thanks
Kurt