I'm cleaning up the wiring on my 85 Blazer. Im installing a sniper 2 fi system with a hyperspark. As far as I can tell the only thing that the ecm would be doing is the tcc, which can be controlled another way. The ecm was never plugged in when I got the vehicle either. Any thoughts on eliminating this ?
CK5
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ECM delete
- Thread starter Timgoheen
- Start date
Hope you have better luck with the sniper crap than i did .
Great, that's a real confidence builder.
The sniper 2 fixed the issues the original sniper had.
Delete the ECM. Make sure there are zero vacuum leaks or exhaust leaks. Even after the O2 sensor. Clean wiring will make a lot of difference also.
Delete the ECM. Make sure there are zero vacuum leaks or exhaust leaks. Even after the O2 sensor. Clean wiring will make a lot of difference also.
This and keep the coil away from all sniper wires especially the power and ground.
If the truck came with an ECM, then it's a California model with the CCC (electronic control of carb primary needles). If that was unplugged, it's unlikely the thing would run right. More likely, is that your truck came with a 305 and the ESC system. That box above your glove box plugs into the distributor and retards timing if the knock sensors ring. It can be bypassed. TCC lockup was not controlled by a computer until the TBI system came out ~1987. If you keep the factory vacuum switch and brake pedal switch, the transmission should continue to lock normally, but the sniper may give you the option of electronic control, if desired. Without knowing any more, it's hard to predict if that could work any better.
Ok, it must be an ESC system then. But the TCC wires do run through it.
The tcc wires to esc are probably just a signal to inform esc of tcc status. I will try to look for that diagram today. Hope I still have it.
I have the diagram Wes, don't worry about it.
Got an '85. Stripped it down and added same kinda thing. IF you have a concern about the TCC stuff, look into the BTO (Bowtie Overdrives) kit that simplifies it all.
the vacuum switch is not included in the BTO kit. The vacuum switch make the tcc lock up much more drivable.
I haven't seen any vacuum lines pertaining to the transmission
Yeah, everyone talks vacuum lines but my truck didnt come with one. And when I have the trans rebuilt (89) it had a newer valve body installed that let it unlock in 4th. Before it always locked 4th and unlocked downshifting 
