The good news I passed smog. The bad news everything after - Mercedes-Benz Forum

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post #1 of 18 (permalink) Old 06-16-2017, 12:11 AM Thread Starter
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The good news I passed smog. The bad news everything after

To long don't read. See below

After deleting my codes I found out that I only had a one day driving permit to get my car smogged. So after fluids and filters changed I began a 3 Part Drive cycle and manage to achieve seven out of the eight codes within 24 hours right before smog. I filled up with shell premium and a new carb and injector cleaner the day of. After arriving at the smog place the Mercedes was tested by Lennie from Of Mice and Men. After weeks of hard work and tedious reading I watched as the car passed every admissions test only to have Lenny yell at me at the end and accuse me of disconnecting the check engine light. Even though when I left for my drive cycle I verified that it worked. It turns out that it burns out literally right when he fucking started the car.

After being scolded by all fifty of his IQ points I booked it over to Napa and scoured my trunk for something that I could jerry-rig into a dash cluster anchor to pull it in the parking lot. This was only after I spent 10 minutes searching and then testing every single fuse in the car including the drivers box and the backseat fuses. They all came up good. After finding a metal gopher trap in the back of my car I took my Gerber and bent the hell out of the gopher trap to look like the hook I saw on Mercedes sources video. And I pulled the cluster only to find that the light had burnt out. Waited 15 minutes for the pretty chill Napa guy to find the correct light bulb I tossed it in and return to the smog shop to have my test administered by George this time. And the Merc passed.

Feeling confident much like Icarus I decided to drive the car up to Cal Poly Pomona to watch my cousin's graduation.

*To long didn't read*
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V V

While leaving downtown San Diego I heard what was the sound of something like a tire popping from the driver side Tire. About a hundred miles into driving that's when I got a check engine light... after arriving I do an obdII check and get a cylinder 6 misfire not too long after i get a cylinder Bank A malfunction. But since I was driving family up I was not able to stop. So I ended up driving the Merc the entire time running on 5 cylinders. I'm worried I fouled up the O2 sensor and may it just ruined my catalytic converter. Today I ended up getting a misfire on Cylinder 6 and cylinder 1 and then a multiple cylinder misfire code.

How bad have I just goofed and what should I do first? I've already ordered a new camshaft position sensor, new spark plugs even though the ones in it look new. Are new cables in the future?
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post #2 of 18 (permalink) Old 06-16-2017, 12:25 AM
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Buy a new coil. On M104 the coil gives power to cylinder 1 and 6.

--1998 MB E300TD 285k
--1997 MB E320 198k
--2004 Dodge Ram 5.7L 212k and holding (damn gas guzzler)
--2011 Suzuki DL650 44k
--1997 MB E320 161k. SOLD...loved that stupid car.
--1998 MB ML320 207k. SOLD, thank heavens!
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post #3 of 18 (permalink) Old 06-16-2017, 08:37 AM
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Deplore knows this engine well, but with multiple misfires, common also is MAF going bad.
Still remember when my son, driving ML320 come home with 10 (YES TEN) different codes, yet the engine running just fine.
New MAF from German Star cured it all.
Good part is that with misfire the computer shuts off the fuel to faulty cylinder, so your cat should be good. MIAU.

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post #4 of 18 (permalink) Old 06-16-2017, 09:41 AM
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Originally Posted by Kajtek1 View Post
Good part is that with misfire the computer shuts off the fuel to faulty cylinder . . .
True?

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post #5 of 18 (permalink) Old 06-16-2017, 11:58 AM
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Was the CEL flashing ? If not, the misfires are not severe enough. Also you have a camshaft position sensor fault. A bad camshaft sensor can cause misfires, however misfires will not cause a bad camshaft sensor fault.

I would check / fix the camshaft sensor issue out first. I say check, because it could be a bad connector / wiring.
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post #6 of 18 (permalink) Old 06-16-2017, 12:47 PM
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True?
Not on your diesel, since you have mechanical injectors, but the whole idea about computer diagnose about cylinder misfire is to prevent future damage.
Still remember, what become anecdotal, the older BMW 12-cylinder was having 2 separate engine computers.
So in case 1/2 of the engine had ignition errors, you still could limp home on the other 1/2 of the engine .... at 140 kph.

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post #7 of 18 (permalink) Old 06-16-2017, 01:05 PM
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My older V6 Ford (Cologne engine) has bank-fire fuel injection, not sequential, so it fires three injectors at once and therefore can't turn off a single cylinder's injector. When it fouls a plug (it does happen, around every 4k miles, from coolant contamination: it has bad head gaskets and cracked heads, and I drive it 54 miles a day, every day), either #1 or #6 cylinder will stop firing, and it it continues to misfire under heavy acceleration, the CEL will blink but it's not shutting off the injectors. I know to stop immediately and change the plug, to avoid damage to the cats. AAA brings it to my driveway (pre-paid towing is what I call it; I get four tows per year.)

I generally catch the failing/failed plug long before it gets to a solid misfire, but it's happened.

I had not heard that the MB gas engines have fine control over the injectors and cut fuel in the event of solid misfire. There's a lot I don't know, and I'm asking if that is real, or only something you've heard. It makes sense, but I'm surprised I hadn't read of it previously.

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post #8 of 18 (permalink) Old 06-16-2017, 03:39 PM
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Yeah it is real. As of ME 1.7 (which is implemented on 1997) up to current cars MB does shut off the injectors in the event of a misfire detection.

My 97 had a misfire in cylinder 2, and when I pulled the spark plugs after a 20 miles drive on the misfire, the spark plug was dry, not wet.

I see this most often in MB with M137/M275 V12 engines and M272/M273 engines. These engines are so stupidly sensitive that if a misfire is detected for a consecutive 3 or 4 revolution, the injectors are shut off.

Kajtek, both of your bluetec will do this too, they will scale back the multiple injector fire in the event of a misfire.

Incidentially, this M104 is not that sensitive to MAF like the later M112/M113 engines as per your son ML320. That's why I suggested the coil first.



One coil powers the colored arrows. He has misfire on 1 and 6. Seems easy enough to check.
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--1998 MB E300TD 285k
--1997 MB E320 198k
--2004 Dodge Ram 5.7L 212k and holding (damn gas guzzler)
--2011 Suzuki DL650 44k
--1997 MB E320 161k. SOLD...loved that stupid car.
--1998 MB ML320 207k. SOLD, thank heavens!
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post #9 of 18 (permalink) Old 06-16-2017, 10:56 PM
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You can verify the coil by swapping another coil and see if the code changes where you put the bad coil (in your case coil from 1/6 cylinders)
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post #10 of 18 (permalink) Old 06-17-2017, 08:21 AM
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How much coil cost?
When I bought my "project" SL500 for next 2 weeks I had phone notifications about any similar car hitting junk yard within 50 miles radius.
When SL are rare, they share lot of parts with S-class, so within few days I had set of coils.
I needed only 1, but at $2 a piece for something that looks pretty new, why not?
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