2G 97-99 CAS Question

[97gsxIA]

So I have a 97-99 Cam angle sensor and a kiggly crank sensor to retain factory signals on the ecu on my 6 bolt.

Curiosity is getting the best of me here....
When I unplug my cas while the car is running it doesn't change how it idles or revs.
How does the ECU know when to send spark or injector pulse of it's unplugged?

 

[miliman13]

People like me use one signal from the cam and feed two wires to the ecu.
(6 Bolt w/ green top Cas)

Sounds like your doing the same but from the crank.

From what i understand the kiggly trigger plate allows you to retain the 7 bolt feed but on a 6 bolt.

 

[97gsxIA]

Right, it's to retain the use of a fixed 97-99 CAS. It's pretty much the exact setup as it was when I had the 7 bolt.
Im just bewildered how the car will run on with the cas unplugged. How's that possible? Is it toast? Have been chasing some intermittent misfire and stutter at wot since the end of last season. Maybe the cause?
Id like to know more how the 97-99 cas communicates with the ecu. Does the ecu just default to set value if it's unplugged?

 

[e39a]

Hey 97gsxla.
I have a couple of questions maybe you can help me,
Since you have a 6 bolt motor and you are running a kyggly crank trigger, have you had any issues with this set up at all?
Do you get any phantom misfire?
Does it run like stock?
I have a 95 talon and I want to run a 6 bolt motor with a 7 bolt head using a 95 style (2g) cam sensor and a kyggly crank trigger using a stock 2g ecu hoping to not run into any issues. Basically i want the car completely stock but with a 6 bolt block.

 

[97gsxIA]

You'll be fine. It changes virtually nothing.
Now back to my question... anyone?

 

[19Eclipse90]

One of two defaults will occur -- not sure exactly when it is one or the other:

1. Fuel is injected into the cylinders in the order 1-3-4-2 with irregular timing
2. Fuel supply is cut off 4 seconds after a problem is detected​

I would not expect the engine to rev well if the sensor is disconnected. Pretty weird.

 

[97gsxIA]

Thanks for the input Brian. It's definitely got me stumped, I'm assuming that it can get slightly close since its got the CPS to use for input, but I figured it wouldn't run at all (or have a hard time doing so)

I'm wondering if it went bad towards the end of last season because the last few days I had it out, it wouldn't go WOT without misfiring on two cylinders and stuttering to hell. Figured it to be a coil or P/T (since the injectors are 6mo old), swapped um with new ones last week when i got it out for this season and still nothing.

Going to replace the CAS today and take a closer look at the timing in link to notice changes.

Is there anyway to see this change the ECU does when the CAS isn't working properly via ECMlink (Not including a DTC), such as the injector order changing?

I'll pick up a misfire code on cyl 2 and 3 intermittently or a random misfire code when the breaking up occurs happens. But no code for the CAS.

 

[97gsxIA]

I wanted to give an update to this line of questioning.

The misfire and dropping of cylinders I was experiencing was a Headgasket failure between no. 2 cylinder and a cooling port.
Found coolant being pushed last night. Ripped the head off and confirmed it. MY fault was not doing a leak down test from the start.

Listen to your elders, kiddos.