Quote:
Originally Posted by EdKiefer
The problem with crank/cam sensors is its used for ignition firing and timing and you want spark to always work.
|
I think ideally you want both ignition and fuel to shut off. This is what happens when you key off too. Leaving one running without the other creates other issues.
My tbi metro stumbled on if I only killed fuel. There was a lead from the distributor (camshaft sensor) that would cleanly kill ignition and fuel and not throw codes when that circuit was opened (with a nc microswitch on the shifter)
even my 97 saturn mpfi would stumble on and accidentally relight occasionally if only killing fuel. Here putting the nc microswitch in series with the crankshaft sensor worked perfectly, w/no codes.
My tdi golf needs the solenoid on the pump to be interrupted with a more substantial switch.
I think we need a database ( a page in the wiki) of car models and proven effective kill switch approaches. Because if you only have to interrupt a signal level circuit, that is as trivial to do as it gets, whereas if you need to interrupt inductive loads (coil & injectors) then you might have to add a relay or two if you want nice tactile push button control over it.