2 THINGS-opinions on ISC and who's still running them, and what are these connectors?
- Thread starter the t3d
- Start date
lagged;1225165 said:
It was a joke although yes I did do that when I was younger when I built my first custom FFIM. And as I mentioned again I do run one now on my new FFIM's.
Seth
ok how would you guys bypass the iscv using the stock ecu? I would assume one way is it u have a pre 89 throttle body and use the adjustment screw to make the car idle. Another way is adjust the throttle lever so that the throttle body is slightly open when ur foot is off the gas.
not that i would im just like taking things apart and seeing how they all work together.
So if the 2 above methods would work for allowing the car to idle without the iscv, how would this affect the cold start injector if the car is cold? would it still dump the fuel even though there is no "fast idle"? So the car would just idle running a lil bit rich until warmed up and the cold start injector cuts itself off?
not that i would im just like taking things apart and seeing how they all work together.
So if the 2 above methods would work for allowing the car to idle without the iscv, how would this affect the cold start injector if the car is cold? would it still dump the fuel even though there is no "fast idle"? So the car would just idle running a lil bit rich until warmed up and the cold start injector cuts itself off?
It gets old repeating this but since I'm such a nice guy I'll do it again: It's impossible for the cold start injector to work unless the engine is being cranked.
jetjock;1249313 said:
ok maybe u mis understood my question or i worded it incorrectly,
this is what im trying to get at.
the ecu controls the iscv for the fast idle to warm up correct? now with no iscv there is no fast idle.
Also the cold start injector fires when the car is cold or below freezing to warm up as well correct?
so say if its below freezing, and once the car turns over, the cold start injector is firing, but there is noo fast idle due to the iscv has ben removed.
that extra fuel will just make the car run rich at the set idle speed correct?
if yes will the richness cause an issue with the idling?
sorry if my previous post was not clear enough.
How can the cold start injector make the car run rich at *any* idle speed if doesn't operate unless the engine is cranking? That's why it's called a cold "start" injector and not a cold "warmup" injector. One of us is confused....
you can think of the CSI as just helping getting things going when the motor is cold, not maintaining combustion.
the ecu uses the regular fuel injectors to do that during cold start enrichment, which dosnt use the CSI.
the ecu uses the regular fuel injectors to do that during cold start enrichment, which dosnt use the CSI.
jetjock;1249353 said:
oooooo yea i got it now it only works when cranking and not running. thanks guys for the clearing up.
so would the above methods i listed, backing out the idle screw on a pre 89 throttle body or adjusting the linkage so the throttle body is slightly open would allow somebody to bypass the iscv on a stock ecu?
I know it will create problems, no fast idle, more electric load etc but just wondering would it work.
thanks
What you're suggesting will work. As long the engine receives air that's bypassed the throttle plate it'll idle. It doesn't care where that air comes from as long as it's been metered.
If what is unhooked? The ISCV? No, it's an output with no direct feedback to the ECU. Nor is there a software function that'll set a code if target idle isn't met. Look at the code list....there isn't one concerning operation of the ISC system.
You guys just lucked out and got him when he is in a good/giving mood. Most often he has a sadistic joy at saying he knows the solution, but won't reveal it, watching members squirm and struggle trying to figure it out. :biglaugh:TheNewRed;1249397 said: