SLK/R170: Multiple ODBII Codes and Rough Idling
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 25
Likes: 0
From: Northern California
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; Feb 18, 2007 at 09:30 AM.
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
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.
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 25
Likes: 0
From: Northern California
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.
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
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..
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 25
Likes: 0
From: Northern California
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..
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 25
Likes: 0
From: Northern California
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
MB World Stories
The Best of Mercedes & AMG
8 Oddball Mercedes Ideas That Actually Made it to Production
Verdad Gallardo
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look
Verdad Gallardo
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish
7 Craziest Things AMG Gas Ever Built
Verdad Gallardo
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 25
Likes: 0
From: Northern California
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 ?
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
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..
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 25
Likes: 0
From: Northern California
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 ?
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
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.
MBWorld Fanatic!
Joined: Feb 2005
Posts: 5,761
Likes: 4
From: North Carolina
98 Black C43 , 12’ ML 350 Blutec
MBWorld Fanatic!
Joined: Feb 2005
Posts: 5,761
Likes: 4
From: North Carolina
98 Black C43 , 12’ ML 350 Blutec
Newbie
Joined: Dec 2006
Posts: 8
Likes: 0
From: Brisbane, Australia
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
Newbie
Joined: Mar 2007
Posts: 2
Likes: 0
Me again
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.
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
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.
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
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.
