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I am still trying to track down a rough idle situation. I've changed the plugs, and the rough idle is still there. I was looking for leaks when I wiggled the hose that goes
into the manifold from the MAP sensor. It seems real loose and moves around easily. I tried to pull it out, but I didn't want to break anything. Thought I better jump on here first before I make it worse. What is the secret to removing this hose? Also, the hose transfers black **** like charcoal to my hands.
Other than the rough idle the car is amazing. When I got it in Dec the idle seemed fine. Could it be tha gas grade? I have only put in Petro Canada 94 octane gas. Maybe I should try mid grade to see if there is a change.
I broke the ends off 2 of those hoses while replacing my valve cover gaskets on a CLK55 https://www.partsgeek.com/ss/?i=1&ssq=Rein+22+9810+008&x=0&y=0
$23 to replace them all. The old ones were so rigid I had to razor slice down the side to pop them off the MAF.
I ran the car while the ends were broken (taped them up) and did not experience a rough idle so that might not be your problem Attachment 441244
haha ok we might be talking about different hoses then
The kit i linked has 2 hoses coming from the top of the valve cover on driver-side, and 1 coming from pass-side. They connect to the side of the MAF at the rear of the engine.
That pic is from the driver-side with the airbox and coil packs removed.
Kevin were you able to figure out how to remove that hose from the manifold? I need to replace mine as well but there seems to be some kind of clamp holding it together and there’s not too much room to work with.
Actually I have not.
I didn't want to pull on it and break something Does yours rotate freely when unhooked from the sensor end? It's weird, mine is seemingly loose, but I've sprayed carb cleaner on it while running and nothing changed.
Maybe throw in a picture of the connector for the group. I tried squeezing the plastic part by the little ears, but nothing. Like I said, it's running so I didn't want to break anything.
I don't have any cigars, so maybe I'll try Incense for a smoke test.
My car seems to idle better with lower octane gas. I thought the computer would adjust for that.
Last edited by Kelvin Bellrose; May 13, 2018 at 12:31 PM.
Here’s the pic I forgot to attach
Here’s a picture that I took last week. It’s not the best but I circled where it connects. I don’t recall mine feeling loose in anyway. I’ll take a look later today or tomorrow. It’s raining today. My issue was that it keeps ripping on the side where it connects to the map sensor, I keep cutting the end and reconnecting hoping it eventually stops tearing cause eventually the hose won’t reach.
I've had mine disconnected at the intake end while working on wiring harness and MAF. The hose actually connects to the intake just above/into the throttle body and forward of the MAF sensor housing. I didn't need to take it loose for what I was doing but didn't know that at the time. The hose did not feel as though it was loose from the other end.
Since your in that area already I would also take a look at the those three manifold flap actuators. I had this same issue of a rough idle that got progressively worse over a few months until I got a code for "running rich". Sometimes the plastic arms on those actuators break or in my case the plastic bushing at the end of one of the arms broke and came off of the manifold. Use a flashlight and screwdriver to move the arms up and down and make sure nothing broke.. Here's a good video:
Hey Kelvin. I HIGHLY Suggest you look at my thread. I had rough idle as well and am guessing you've taken off your engine cover recently. If u read my thread, i thought it was my throttle body and actuator lever. IT wasnt. Read the whole thread. It might just fix your car. After that you have to do a drive cycle and your car will delete all the faulty codes. Heres my thread https://mbworld.org/forums/clk-class...ine-light.html
If you have rough idle and codes for running rich. Your problem is the engine cover. Scroll down to where show my cover. Aftsr i fixited it i had 0 codes and the car ran perfect. It a cheaper fix so it wouldnt hurt for you to check my thread. after fixing brackets and cealing maf all you have to do is a drive cycle and all codes wil erase!! If not, its most likely your actuator lever as @TechSuperstar pointed out
Last edited by Derek Likos; May 15, 2018 at 10:21 PM.
If you have rough idle and codes for running rich. Your problem is the engine cover. Scroll down to where show my cover. Aftsr i fixited it i had 0 codes and the car ran perfect. It a cheaper fix so it wouldnt hurt for you to check my thread. after fixing brackets and cealing maf all you have to do is a drive cycle and all codes wil erase!! If not, its most likely your actuator lever as @TechSuperstar pointed out
The MAP sensor hose just pulls off the intake manifold on the front. I doubt that's your issue and if you run the car with it disconnected you'll get a P0106 code. I know cause I just forgot to put mine back on when I changed my intake manifold. I'm going to post some stuff on my manifold thread later today. I found to broken parts on the front of mine.
Kevin were you able to figure out how to remove that hose from the manifold? I need to replace mine as well but there seems to be some kind of clamp holding it together and there’s not too much room to work with.
Did you get it out? Read my reply to Kevin, I also attached a picture.
Last edited by a3grimlock; Jan 10, 2020 at 11:45 PM.
I am still trying to track down a rough idle situation. I've changed the plugs, and the rough idle is still there. I was looking for leaks when I wiggled the hose that goes
into the manifold from the MAP sensor. It seems real loose and moves around easily. I tried to pull it out, but I didn't want to break anything. Thought I better jump on here first before I make it worse. What is the secret to removing this hose? Also, the hose transfers black **** like charcoal to my hands.
Other than the rough idle the car is amazing. When I got it in Dec the idle seemed fine. Could it be tha gas grade? I have only put in Petro Canada 94 octane gas. Maybe I should try mid grade to see if there is a change.
Get a small box cutter and cut the vacuum hose on both side then pull the hose, insert the new hose.
If you still have rough idle after renewing the hose and MAF pressure sensor, unplug the MAF sensor wiring and clean your MAF sensor (use the advice sensor cleaner). It’s where your top air filter housing is hook up by the firewall
Last edited by a3grimlock; Jan 10, 2020 at 11:50 PM.
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