Too bad the internet, UA-cam & you were not around in the early, mid 90's. Mom has an '82 380SL that had constant high idle issues & I didn't know where to start. You made it look simple to repair.
Thank you very much. It was one of my earlier videos so the camera work isn't super great. Once you pull the glove box out, it looks cramped but module is actually very easy to slide out. The no power to the idle motor is usually the dead giveaway
While the car was running I disconnected the plug from the idle control motor and there was no change at all in the idle speed. I was under the impression the idle would change or at the very least fluctuate a bit. I'll remove it and clean it out but, I may just replace it since it appears not to be doing anything when plugged. Thank you RV
Test the plug going to the idle control motor for power and ground. If you are missing either the module is bad.... you can also take a couple jump leads and put power and ground to the idle motor, if it changes speed or moves its good, you can. Also do that on the bench
Thank you one question I have a C107 380SLC 1981 does this car also have a similar or same idle module? Or is it only 1985 onwards? Thanks for response
It has one but it is different I'm not sure on it's location I was able to find the part here www.pelicanparts.com/catalog/SuperCat/3420/MBZ_3420_FULINT_pg3_idle-control-units-and-parts.htm
You can attempt to repair them by going over all the soldier joints. I don't think you can rebuild them, replacement units are pretty cheap, I put the new board in the old housing to keep it looking original
@@nsigarage5212 I ordered a new module for $ 150 and $50 core not coming till 4/16/21 so i thought about how I can twist this faulty old one within the housing - so I put a small wooden shim on one side inside the module housing and slid the green transistor board back in the housing so it would twist within as I snapped it shut - Boom no more high idle it worked great - so a temporary fix till new one comes in. So now I'm thinking this fix may last a long time and should not buy new one right away lol - Thanks for your help with this great video! Ernie D.
Great Video, I have a question I have a 1985 500SL R107. Thing is the idle sometimes is high then I lower it then goes too low and have to increase it. It appears to de adjust on its own. I've checked for vacum leaks, can't seem to find any. I could replace the control module but, I don't want to spend money on something just as a guess. Do you have any ideas what the issue may be, thanks. RV
I the control motor adjusts automatically, I'm not sure where you are adjusting in. These motors get gunked up and sticky over time. I would start with removing the idle control motor and flushing it with brake cleaner and a soft pipe cleaner type brush
And if there’s power to the ICV? Then what? (Which means my module is good) so, the valve it is, or could be idle control switch got the pins rotated wrong when plugging in connector
Power and ground to the ICV would indicate the module is trying to control it. You can also unplug the icv and touch power and ground to on the prongs and see if anything changes. It is a screw type motor so you cant mess up the power and ground, one way would increase RPM other wound decrease. I apologize for the bad camera work it was one of my first videos
My 1982 keeps stalling when I am driving it and gets to a point when it just stalls as soon as I put it in gear...could the module be the problem or the idle speed valve
It would be hard for me to tell you without seeing the vehicle. It could be plenty of things, if you give it a little throttle while putting it in gear and it stays alive I would look into the idle motor being stuck or dirty, you can also unplug the idle motor at idle and see if anything changes, or unplug it and give it Power and ground to activate it. When the modules fail its usually a high idle problem and not a stalling issue. But you can un plug the module and see if it makes any difference
Too bad the internet, UA-cam & you were not around in the early, mid 90's. Mom has an '82 380SL that had constant high idle issues & I didn't know where to start. You made it look simple to repair.
Thank you very much. It was one of my earlier videos so the camera work isn't super great. Once you pull the glove box out, it looks cramped but module is actually very easy to slide out. The no power to the idle motor is usually the dead giveaway
This worked perfectly! Twisting the circuit board brought the idle back to normal confirming my suspicions of a faulty idle control module.
And I really appriciate you taking your advise.
Thank you for a great ,informative video. I own a 1982 SL380 R107. ( Signal Red with Palomino interior. )
While the car was running I disconnected the plug from the idle control motor and there was no change at all in the idle speed. I was under the impression the idle would change or at the very least fluctuate a bit. I'll remove it and clean it out but, I may just replace it since it appears not to be doing anything when plugged.
Thank you
RV
Test the plug going to the idle control motor for power and ground. If you are missing either the module is bad.... you can also take a couple jump leads and put power and ground to the idle motor, if it changes speed or moves its good, you can. Also do that on the bench
Thanks this helps
Thank you one question I have a C107 380SLC 1981 does this car also have a similar or same idle module? Or is it only 1985 onwards? Thanks for response
It has one but it is different
I'm not sure on it's location I was able to find the part here
www.pelicanparts.com/catalog/SuperCat/3420/MBZ_3420_FULINT_pg3_idle-control-units-and-parts.htm
Awsome Vid NSI - I twisted my module and it changed idle - question - can i repair or rebuild my module?
1985 380SL
You can attempt to repair them by going over all the soldier joints. I don't think you can rebuild them, replacement units are pretty cheap, I put the new board in the old housing to keep it looking original
@@nsigarage5212 I ordered a new module for $ 150 and $50 core not coming till 4/16/21 so i thought about how I can twist this faulty old one within the housing - so I put a small wooden shim on one side inside the module housing and slid the green transistor board back in the housing so it would twist within as I snapped it shut - Boom no more high idle it worked great - so a temporary fix till new one comes in. So now I'm thinking this fix may last a long time and should not buy new one right away lol - Thanks for your help with this great video! Ernie D.
Great Video, I have a question I have a 1985 500SL R107. Thing is the idle sometimes is high then I lower it then goes too low and have to increase it. It appears to de adjust on its own. I've checked for vacum leaks, can't seem to find any. I could replace the control module but, I don't want to spend money on something just as a guess. Do you have any ideas what the issue may be, thanks. RV
I the control motor adjusts automatically, I'm not sure where you are adjusting in. These motors get gunked up and sticky over time. I would start with removing the idle control motor and flushing it with brake cleaner and a soft pipe cleaner type brush
And if there’s power to the ICV? Then what? (Which means my module is good) so, the valve it is, or could be idle control switch got the pins rotated wrong when plugging in connector
Power and ground to the ICV would indicate the module is trying to control it. You can also unplug the icv and touch power and ground to on the prongs and see if anything changes. It is a screw type motor so you cant mess up the power and ground, one way would increase RPM other wound decrease. I apologize for the bad camera work it was one of my first videos
My 1982 keeps stalling when I am driving it and gets to a point when it just stalls as soon as I put it in gear...could the module be the problem or the idle speed valve
It would be hard for me to tell you without seeing the vehicle. It could be plenty of things, if you give it a little throttle while putting it in gear and it stays alive I would look into the idle motor being stuck or dirty, you can also unplug the idle motor at idle and see if anything changes, or unplug it and give it Power and ground to activate it. When the modules fail its usually a high idle problem and not a stalling issue. But you can un plug the module and see if it makes any difference
@@nsigarage5212 Thanks for the reply....I replaced the idle control valve and all is good now.
Or… over voltage protection relay in the fuse block
Wouldnt that be from a bad alternator/voltage regulator