04rev600

I have a 93 camaro with a 5.3. After I did the swap I havent had rpm signal. When i connect it to any computer it will not read rpm. I runs perfectly fine. I also believe i have no rev limiter. Is there some type of sensor that may be bad and cause this problem? Any advice would be great.

Thanks
Carter

EFIHARNESS

What ecu do you have ? if it is the 0411, tach out is blue 58.Steve

04rev600

What should I be looking for on this blue wire if i go to test this? Im not sure off the top of my head what pcm but i do know its off of a 98 ls1. Every other gauge works fine.
Thanks.

1964SS

iTrader: (1)

Tach out on 1998 is different. It is pin 35 (white) on PCM C2 connector.

http://lt1swap.com/1998_ls1_pcm_pinouts.htm

Speartech

iTrader: (14)

The 93 Z28 tach still triggered off of the ignition coil negative pulse instead of a PCM type trigger, so the output from the PCM may not have enough ooomph to trigger that tach. You may need something like a dakota digital tach adapter box that has a high output tach trigger. In 94 the Camaro switched over to a PCM triggered tach.

04rev600

But besides my actual tach not working, i also dont have feedback when i connect a scan tool to my obd2. When the car is running my scan tool says 0 rpms. Is there something else that could possibly be causing both of these issues? Thanks so much for the advice so far

Carter

aknovaman

iTrader: (7)

It depends on what ecu you are using and the file settings concerning the rpm at the tach wire. Do any of your other Gage's function in the scanner?

04rev600

Ill hook up my scanner and check. Thanks

aknovaman

iTrader: (7)

Pm me your number and i can talk you through some things if that does not work.

04rev600

Pm sent
Thanks again for everyones help

Dave Plummer

The instruction/installation manual for the LS3 says that the following, please review it to see if it applies to your situation. I'm wondering if a pull-up resistor might help and avoid the use of a box, but can't say.