03-19-2018, 03:22 AM
that block is only the fast idle input to the ECU (CALLED A WIRED 'OR' LOGIC " DEVICE, If any input goes true, the output to the ECU goes true for fast idle.
air leaks on this engine do not caused misfire, ever, (its speed density system).
in order, called basics in the business (ASE)
only bad compression on any or all cylinders.
bad spark, replace the VR sensors or known to like to fail, and the thing there attached, inside the distrib. igniter. fails.
This ISC operates at all times, its just idle controller that thing (plus one other thing , deceleration dash pot actions)
The ISC never ever cases misfire, unless RPM falls below 750 RPM and if falls to 400 (like EGR does stuck open) the engine shakes a hard, and is gross misfire, (illegal rpm caused only)
same with all vacuum leaks of ANY kind, causes fast or worst fast idle and with full power and never causes misfire, did you know your right foot is a human IAC/ISC> its a fact.
and works totally opposite of any 16v (air density system is hard right different)
here if the engine is perfect and no melted cat here is the misfire causes.
just 3
1: spark bad. (even the distributer bad and is common on 89/90 , never on 91, up, most cases.
2: fueling way rich, like if the vacuum hose to the MAP is bad in any way or clogged on both nipples and the hose. or the filter device seen on that line is cogged.
3: egr stuck open RPM below 800, even 400.
when you get misfire, please tell
hot engine 180f+
cold engine, below 150F is cold. 150f is the magic temp.!
idling what is rpm
not idling or driving
even terrain... hills ,flat or
what is right foot doing, (3 things off pedal or cruise or wot)
what is the speed.
what gears misfire.
if it misfires, parked in any way shape or form hot or cold say so, as that is 10x more easy to fix than driving.
air leaks on this engine do not caused misfire, ever, (its speed density system).
in order, called basics in the business (ASE)
only bad compression on any or all cylinders.
bad spark, replace the VR sensors or known to like to fail, and the thing there attached, inside the distrib. igniter. fails.
This ISC operates at all times, its just idle controller that thing (plus one other thing , deceleration dash pot actions)
The ISC never ever cases misfire, unless RPM falls below 750 RPM and if falls to 400 (like EGR does stuck open) the engine shakes a hard, and is gross misfire, (illegal rpm caused only)
same with all vacuum leaks of ANY kind, causes fast or worst fast idle and with full power and never causes misfire, did you know your right foot is a human IAC/ISC> its a fact.
and works totally opposite of any 16v (air density system is hard right different)
here if the engine is perfect and no melted cat here is the misfire causes.
just 3
1: spark bad. (even the distributer bad and is common on 89/90 , never on 91, up, most cases.
2: fueling way rich, like if the vacuum hose to the MAP is bad in any way or clogged on both nipples and the hose. or the filter device seen on that line is cogged.
3: egr stuck open RPM below 800, even 400.
when you get misfire, please tell
hot engine 180f+
cold engine, below 150F is cold. 150f is the magic temp.!
idling what is rpm
not idling or driving
even terrain... hills ,flat or
what is right foot doing, (3 things off pedal or cruise or wot)
what is the speed.
what gears misfire.
if it misfires, parked in any way shape or form hot or cold say so, as that is 10x more easy to fix than driving.
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