SLK/R170: Multiple ODBII Codes and Rough Idling
#1
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
Multiple ODBII Codes and Rough Idling
My 2000 SLK230 with 80K miles started driving rough when the engine was cold. Now the problem has become worse. It idles very rough and the Check engine light has come one (hot or cold). I scanned it and got the following codes:
P0170 Fuel Trim Malfunction Bank #1
P0304 Cylinder 4 Misfire
P0110 IAT Sensor Circuit Malfunction
P0410 Secondary Air Injection System Malfunction
P0100 MAF or VAF Circuit Malfunction.
Where on earth do I start ?. BTW, the MAF was replaced recently and have tried other ones with no success.
Please help. With these many codes, the dealership will probably charge an arm and a leg to diagonise it. Could it be one element causing all these codes ?
P0170 Fuel Trim Malfunction Bank #1
P0304 Cylinder 4 Misfire
P0110 IAT Sensor Circuit Malfunction
P0410 Secondary Air Injection System Malfunction
P0100 MAF or VAF Circuit Malfunction.
Where on earth do I start ?. BTW, the MAF was replaced recently and have tried other ones with no success.
Please help. With these many codes, the dealership will probably charge an arm and a leg to diagonise it. Could it be one element causing all these codes ?
Last edited by eozomaro; 02-18-2007 at 09:30 AM.
#2
Super Member
one thing you might want to check is the cam adjuster solenoid. I have noticed on alot of the 230 engines (the 111.xxx engines to be exact) that the solenoid starts to internally leak oil past the connector and it soaks up into the engine harness and eventually works its way to the ECU. Take the small cover off the front of the engine and disconnect the plug. The cam adjuster solenoid is the big round metal object bolted to the front of the cylinder head cover with 3 bolts. If you see oil inside the connector, then I would recommend a new engine harness, the solenoid, possibly the ECU and there is an adapter harness between the solenoid and the engine harness that we are installing now to help prevent this.
#3
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
one thing you might want to check is the cam adjuster solenoid. I have noticed on alot of the 230 engines (the 111.xxx engines to be exact) that the solenoid starts to internally leak oil past the connector and it soaks up into the engine harness and eventually works its way to the ECU. Take the small cover off the front of the engine and disconnect the plug. The cam adjuster solenoid is the big round metal object bolted to the front of the cylinder head cover with 3 bolts. If you see oil inside the connector, then I would recommend a new engine harness, the solenoid, possibly the ECU and there is an adapter harness between the solenoid and the engine harness that we are installing now to help prevent this.
#4
Super Member
open the hood and look down at the Valve cover. There is a small plastic section on the front of it that is just clipped on. about 2 inches deep and as wide as the valve cover. You should be able to reach down on the front of it and unclip it and pull it off. After you get it off, you will be able to see what I am talking about.
Also, I wouldn't have any pictures since I don't actually own one of these cars. I just work on them for a living..
Also, I wouldn't have any pictures since I don't actually own one of these cars. I just work on them for a living..
#5
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
open the hood and look down at the Valve cover. There is a small plastic section on the front of it that is just clipped on. about 2 inches deep and as wide as the valve cover. You should be able to reach down on the front of it and unclip it and pull it off. After you get it off, you will be able to see what I am talking about.
Also, I wouldn't have any pictures since I don't actually own one of these cars. I just work on them for a living..
Also, I wouldn't have any pictures since I don't actually own one of these cars. I just work on them for a living..
#6
Super Member
you have to grab the middle of it in the front and just pull it forward hard. They never seem to want to let go but once they do, just pull it up and out of the way..
#7
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
Hey, thanks a bunch.....I finally got the cover off !. The connector was just dusty and the terminals were clean - no oil inside it. Now what's next ?
Trending Topics
#9
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
Thanks.
BTW, I cleared the codes and drove the care for a while, then scanned it again. This time the only code I get is the P0304. How do I get to the spark plug for cylinder #4 ?
BTW, I cleared the codes and drove the care for a while, then scanned it again. This time the only code I get is the P0304. How do I get to the spark plug for cylinder #4 ?
#10
Super Member
you need to remove the red cover in the center of the valve cover that says Kompressor on it and then remove the rear spark plug boot so that you can access the spark plug. Be sure to remember how the spark plug wires fit in that valley incase you decide to take them all off at once..
#11
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
It seems that there is a big black element on top of spark plugs 2 and 4. I guess I have to remove it first ?. If so, do you know what kind of tool I need to remove the 2 bolts holding this device ?
#12
Super Member
those black "devices" you are looking at are your coils. If I remember correctly, you will need an E8 or E6 torx socket and a ratchet and then they pull up and off of the spark plugs.
#13
Junior Member
Thread Starter
Join Date: Jun 2004
Location: Northern California
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
SLK230
Thanks racin_fool.... I changed spack plug#4 and now the car runs like a charm!. No more ECU codes! I'll change the other 3 plugs later.
#14
Super Member
out of curiosity, how many miles are on your car and have the spark plugs ever been changed before?
They are recommended to be changed every 30k miles..
They are recommended to be changed every 30k miles..
#15
MBWorld Fanatic!
![](https://mbworld.org/forums/images/ranks/veteran_army.png)
#17
MBWorld Fanatic!
![](https://mbworld.org/forums/images/ranks/veteran_army.png)
#18
Newbie
Join Date: Dec 2006
Location: Brisbane, Australia
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
1978 280CE & 1997 SLK230 Kompressor
one thing you might want to check is the cam adjuster solenoid. I have noticed on alot of the 230 engines (the 111.xxx engines to be exact) that the solenoid starts to internally leak oil past the connector and it soaks up into the engine harness and eventually works its way to the ECU. Take the small cover off the front of the engine and disconnect the plug. The cam adjuster solenoid is the big round metal object bolted to the front of the cylinder head cover with 3 bolts. If you see oil inside the connector, then I would recommend a new engine harness, the solenoid, possibly the ECU and there is an adapter harness between the solenoid and the engine harness that we are installing now to help prevent this.
I have no running problems, but would like your advice re preventive fix
Would you think the adapter harness would be enough of a fix if no oil appears to have tracked into the loom.............
Is GEO25D Starter Line #271 150 27 33 correct for the oil blocking adapter......or are there different connectors on different models?
I have heard that only some later 2000/2001 Magnets leak.....but my Australian 1997 definitely has a leak...........is there any difference in visual appearance or connectors to tell the bad from the good.........
This problem seems to be common and potentially expensive.........do you think all M111 engine owners should consider the anti-oil loom mod?
Thanks
David
#19
![Thumbs up](https://mbworld.org/forums/images/icons/icon14.gif)
While out for a nice Sunday drive, that dreaded "check Engine " light returned to taunt me some more. This time I recieved the following codes
1. PO173- fuel consumption value for bank 2 exceeded the specified range
(bank 1 identifies the location of cylinder #1, while bank 2
identifies the cylinders on the opposite bank)
2. PO410- The pcm has determined that a malfunction exists in the secondary
air injection system.
This is on a 2001 SLK320 with 65K miles. Thanks for the help on this and thanks Racingfool for your help on my other problem.
1. PO173- fuel consumption value for bank 2 exceeded the specified range
(bank 1 identifies the location of cylinder #1, while bank 2
identifies the cylinders on the opposite bank)
2. PO410- The pcm has determined that a malfunction exists in the secondary
air injection system.
This is on a 2001 SLK320 with 65K miles. Thanks for the help on this and thanks Racingfool for your help on my other problem.
#20
Super Member
Racin_fool...........I have a 1997 SLK 230K and have noted the electrical connector on the Cam Adj Magnet is moist with oil....but no oil apparent on wire or in loom.........
I have no running problems, but would like your advice re preventive fix
Would you think the adapter harness would be enough of a fix if no oil appears to have tracked into the loom.............
Is GEO25D Starter Line #271 150 27 33 correct for the oil blocking adapter......or are there different connectors on different models?
I have heard that only some later 2000/2001 Magnets leak.....but my Australian 1997 definitely has a leak...........is there any difference in visual appearance or connectors to tell the bad from the good.........
This problem seems to be common and potentially expensive.........do you think all M111 engine owners should consider the anti-oil loom mod?
Thanks
David
I have no running problems, but would like your advice re preventive fix
Would you think the adapter harness would be enough of a fix if no oil appears to have tracked into the loom.............
Is GEO25D Starter Line #271 150 27 33 correct for the oil blocking adapter......or are there different connectors on different models?
I have heard that only some later 2000/2001 Magnets leak.....but my Australian 1997 definitely has a leak...........is there any difference in visual appearance or connectors to tell the bad from the good.........
This problem seems to be common and potentially expensive.........do you think all M111 engine owners should consider the anti-oil loom mod?
Thanks
David
If I had one of these engines I would definitely take the time and money to install this harness to prevent the expensive repairs that would follow oil tracking all the way through the system.
#21
Super Member
While out for a nice Sunday drive, that dreaded "check Engine " light returned to taunt me some more. This time I recieved the following codes
1. PO173- fuel consumption value for bank 2 exceeded the specified range
(bank 1 identifies the location of cylinder #1, while bank 2
identifies the cylinders on the opposite bank)
2. PO410- The pcm has determined that a malfunction exists in the secondary
air injection system.
This is on a 2001 SLK320 with 65K miles. Thanks for the help on this and thanks Racingfool for your help on my other problem.
1. PO173- fuel consumption value for bank 2 exceeded the specified range
(bank 1 identifies the location of cylinder #1, while bank 2
identifies the cylinders on the opposite bank)
2. PO410- The pcm has determined that a malfunction exists in the secondary
air injection system.
This is on a 2001 SLK320 with 65K miles. Thanks for the help on this and thanks Racingfool for your help on my other problem.