Thanks you for this video!!! This is some great info & everything Ive been searching to find! I have the same diagnostic codes happening on my 92 Cadillac Deville coupe. I just ordered a new ISC valve motor also throttle position switch that i'm looking to replace. I didn't try calibration before I purchased them. Question: Shall I try calibration after replacing new parts or calibration on the parts that are already on my car?
Hello I have a question how it should behave ISC motor in its extreme positions. When I apply 12v to it when it withdraws to the maximum it simply stops in the extreme position. When I reverse the polarity it extends to the maximum but does not stop. As if it jumps to infinity. Is this a symptom of damage isc ?
My dad's 93 sedan Deville would not start with out putting my foot on the gas to open the blades up. The actuator was really noisy at trying to start it and when the key went off. Got a new actuator today and I noticed the thread was in the unit but way out compared to unit in the car. This procedure while relearn the position as in you video? And wouldn't you know it it's freezing out side here in Canada today-12 celcus . Thanks for the video!!
Some of the aftermarket ISC setups have to be used with the bracket it comes with, you can’t mix and match an original bracket with the aftermarket ISC and screw because, as you said, the adjustment screw would be too long. The bracket that comes with the replacement ISC makes the unit sit further back. That’s why it has the longer screw.
I am glad I came across your vid, my ISC is chattering at shut down. I replaced the old thinking it was bad. Now I may have gone the wrong way. Did save the old one though. Thanks for the guidance...
Hi Andrew, This is Keith, I just replaced my 91 Cadillac coupe deville idle speed control motor and I push the screw and plunger all the way down and adjusted the screw up until I got to .030 using my spark plug gap. Actually before removing the old one I scratched a line just where it hits the screw and I started up and it ran idle above 750 rpms and then I heard it idle down and seems like it's running very well Idling I mean... Test drove it and all seems well. I was wondering if I should try out your recalibration?
If it’s running well, just leave it alone. As you drive it, it will make small calibration changes each time by itself. After a month of daily driving, even if completely uncalibrated to begin with, it’ll work it’s way into proper calibration.
I have a 92 Deville as well, today my gas range feature was changing to km instead of gal so I hit the reset button for a few seconds thinking that would help - it turned off and wouldn't start up a couple of times.. my check engine light turned off (the only light I had) and the range did start working.. but... what the hell did I do?
Hi Andrew. Thanks for the video. Got a '90 Cadillac DeVille. While I can see all info on upper shelf (speedometer, odometer, etc.), I can't see any info on lower shelf (gas, temp, etc.). It's just blank and it's stuck on warm defrost. Checked fuses all good. Any ideas? Thank you sir.
@@andrewarmitage168 Thanks for replying, Andrew, I appreciate that. Could you please tell me what the acronyms ECU and BCM stand for? What exactly is a factory shop manual and where would I get it? Is this something a typical mechanic could easily diagnose and fix? Have a great day, and again, thanks for the great videos!
@@A2121-h3b Engine Control Unit and Body Control Module. They are the two computers that run all the electronics in the car. You can get a shop manual on eBay. It tells you, step by step, how to diagnose any problems with your car. They’re normally about $30 for our cars.
have a problem with my 93 cadi deville when i turn it on its making a rubbing metal sound on what i think only when its idleling but when its put on drive mood it goes away driving it comes off and on but is loud when its on park any leads ?
What does this do bro ? Cause my check engine light is on and my car shakes like it wants to cut off . And stalls when I pull off . But the obd scanner doesn’t work when I plug it up . Like a fuse is blown or somthin
A ‘92 doesn’t have an OBDII scanner. There are too many issues that could cause what you described. Bad spark plugs or wires. Cracked distributor cap, vacuum leak, blown intake or head gaskets, not timed properly, throttle body gummed up, bad O2 sensor, etc… You should probably find a trustworthy mechanic to take a look.
@@andrewarmitage168 ok yea I will do that tomorrow. But I have a 1990 but it takes obd 1 I have the converter to hook it up to the obd 2 . But when I plug it up nothin happens
No. You’ll have to get a factory shop manual for those procedures. That’s a 4.1L engine with different procedures to diagnose or reset electronic parameters.
My gas pedal taps for a short while everytime I turn the car on or off and my idle is very poor, and my car stalls, its a 1990 cadillac deville, does anyone have any suggestions?
That tap is your ISC adjusting, and the idle is poor because it is likely adjusted wrong (assuming you don't have a vacuum leak or many other problems that would make the car run poorly.) If you just replaced the ISC, then you should know that you can not just bolt on a new ISC and be good to go. You will need to properly adjust your ISC before you can calibrate it. This video is only for calibration. Old fashioned way to set up ISC: 1. Run the engine and (by hand) open up the throttle to to ~3000RPM. Simultaneously firmly press down on the ISC plunger until it is fully retracted. (you can also back-probe the ISC with jumpers from the battery to retract it. I believe it is the outer two wires. If the plunger extends, then reverse polarity.) 2. When the plunger is fully retracted, have a helper unplug the ISC motor. (The helper is unnecessary if you back probed the ISC.) 3. Tighten/Loosen the ISC plunger screw until the gap between it and the throttle is .030-.060. 4. Test your TPS by back-probing with a voltmeter. (This is under the intake manifold so it will need to be removed. I believe it is the passenger side and middle wire.) Set voltmeter to DC and turn ignition to on, but don't start car. With the throttle closed the Voltmeter should read 0.45V- 0.55V. If not then adjust the TPS until it does. When throttle is fully open the volts should read 4V or more. With TPS properly set, you can replace the intake manifold. 5. Now you can proceed to the part of the video where he turn the OBD ON and OFF a few times. Then go for a quick drive to warm it up. Finally do the 5 Min idle in park followed by the 1 min idle in Drive.
There is a way to make your fuel gage gallons change to show the RPM. I just forget how to do it. It's a settings change somewhere in the diagnosis menu.
