The security lamp is turned on by the PCM grounding the security lamp.
The PCM must get the correct code from the EVO/PASSLOCK module or
the PCM will ground the lamp and kill the injectors.
Have you tried running it with the CPS disconnected and then again with the OPS disconnected
to see if there is any difference in how it runs?
I doubt the injectors are the problem or the IP since both IP's do the same thing.
Probably electrical or even timing gear off.
You could try removing...
A 97 truck should not have passlock, it started in 98.
With passlock the resistor mod simply bypasses the ignition switch sensor.
Passlock will still be there, and can only be turned off by programming the PCM.
A 97 PCM does not have passlock enabled.
I don't think that will work.
The VSSB does not output a modified VSS signal (40 PPR), that goes straight thru.
It only outputs modified PPM signals.
The gasser PCM would need a modified VSS signal.
There are magic boxes that will do that.
ATP was making that cable long before I contacted them.
They either think it is the same as the 6.5 cable or they just
don't want to invest in another part number.
Y-368 is for the 6.2 and uses a different bracket on the IP.
This has been a problem for a long time.
And on the IP differences -...
If you have a 99 then the ISS speed sensor at the front of the trans will have DK BLU/WHT & RED/BLK wires.
The VSS on the x-fer case will have LT GRN/BLK & PPL/WHT wires.
The rear speed sensor on the trans is not used.
I have seen these conns. get mixed up.
The conn. at the arrow should lead to the rear VSS, on the x-fer case.
It is a "union" to the rear VSS conn.
The speed sensor bracket is normally part of the speed sensor.
Anyway, this is how they are bolted on.
Has the van worked correctly before these problems or did you buy it like it is?
It would help if you could get the code and part number off the eprom chip in the TCM.
EXAMPLE -