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1998 Mercedes-Benz CL500
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Discussion Starter #1
Ok guys here goes, I drove to Vegas last week and my on my way back my 98 CL500 suddenly went into stumble home mode and the check engine light went off and eventually started blinking. I thought it was the transmission at first so I took it to a shop that ran the codes and it came back saying the all the cylinders on the driver side are misfiring. I had no choice but to drive it home and on the way the car ate all its oil. Now today I replaced the spark plugs, to no avail. Next I switched the ignition coils around to see if it was possible that 4 of them were busted, they weren’t, again no difference. Then I replaced the cam shaft sensor, to no avail. As it stands now the codes still read misfires on all the driver side cylinders and I’m out of ideas. Also I can hear a loud knocking coming from the bottom of the engine. (Sounds like crank shaft… God I hope not.) Also did compression test and compression is fine. And ideas?
 

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Ate all it's oil? What does that mean? It's sound a like timing chain jump but compression would likely be affected. What's the compression on each of the cylinders? I'd get an OBDII reader and start reading the codes yourself - has to be some with a CE light.
 

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1998 Mercedes-Benz CL500
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Discussion Starter #3
Ate all it's oil? What does that mean? It's sound a like timing chain jump but compression would likely be affected. What's the compression on each of the cylinders? I'd get an OBDII reader and start reading the codes yourself - has to be some with a CE light.
I checked the oil before I left Vegas when the "check engine" light came on and the oil was fine. When I got home there was no oil left, I had to put 3 quarts before I saw anything on the dip stick. I have an OBD II reader and it's show misfires on the cylinders on the drivers side compression read at 175.
 

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That sounds like good compression but how does it compare to the passenger side? I'd take off the valve covers and oil pan and see what you find. A pure electrical problem shouldn't affect oil consumption.
 

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nothing broken. finally!
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So where did the oil go?

it's impossible to burn off 3-4qts in 200miles or whatever. well not impossible but if that happened you just have to open up the motor. that's massive mechanical failure

option 2 it leaked out which should be pretty obvious to confirm or not
 

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nothing broken. finally!
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i wouldnt. i would find a local place that knows these motors well. check around various forums, there are several lists by state.

i believe this site also has one. like recommended shops or whatever the title is
 

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1998 Mercedes-Benz CL500
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Discussion Starter #8
I checked the oil before I left Vegas when the "check engine" light came on and the oil was fine. When I got home there was no oil left, I had to put 3 quarts before I saw anything on the dip stick. I have an OBD II reader and it's show misfires on the cylinders on the drivers side compression read at 175.
Engine Codes P0156 - O2 Sensor(Bank 2, Sensor 2)
P0170 - Fuel Trim (Bank 1)
P0306 - Cylinder 6 Misfire Detected
P0300 - Random Misfire Detected
P0308 - Cylinder 8 Misfire Detected
P0307 - Cylinder 7 Misfire Detected
P0442- Evaporatative emission system leak deteced (small leak)
 

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1x 98 S500, 1x 07 S550
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From the little I've heard, sure sounds like you've slipped the timing chain, probably on the slack side cams (pax). Maybe the tensioner is cracked and thrown pieces into the gears? Would explain the noise, and all 4 cyls acting up at once
 

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Mercedes 600 SE 1991 Oct.
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My V12 had a similar problem: 5 cylinders misfiring.
The local MB dealer could not fix the problem, MAF + ignition leads and rotors plus the main cables that have the usual wiring harness have been changed, but the problem remained.
I took the car to a repairman who is a car diagnostic specialist and he checked the spark cables and 5 of them were faulty. So these 5 will be changed to new ones, and perhaps this will solve the problem.
Another thing: when I had to drive 400 miles to get back home with the misfiring engine (7 cylinders were working correctly and the car did not go into stumble home mode) the car ate 0.5 litres of oil. When there was no misfiring, then there was no oil consumption either (not at even 4000 miles).

So about wednesday I get to know if the cable change solved the problem or not.
 

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1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
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1,291 Posts
I had 1 cylinder misfiring and the car felt like it was dying when I was at the stop light. It turned out to be a bad spark plug wire. Replaced all of them with factory Beru wires and it stopped it.

Before you do anything major....I am curious as to whether or not you filled up at a questionable gas station along the way to Las Vegas. It would not be your fault...just a shady gas station adding some water to their product. See if you can siphon the gas out of your tank.
 

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1998 Mercedes-Benz CL500
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Discussion Starter #12
I had 1 cylinder misfiring and the car felt like it was dying when I was at the stop light. It turned out to be a bad spark plug wire. Replaced all of them with factory Beru wires and it stopped it.

Before you do anything major....I am curious as to whether or not you filled up at a questionable gas station along the way to Las Vegas. It would not be your fault...just a shady gas station adding some water to their product. See if you can siphon the gas out of your tank.
You know the transmission place I went to in Vegas asked me the same thing but before I left I filled up at Costco then just before Before I got into Vegas I filled up at the Nevada Landing. I don't remeber the Station's name but it's a HUGE gas station and I always put 91 octane.
 

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1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
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You know the transmission place I went to in Vegas asked me the same thing but before I left I filled up at Costco then just before Before I got into Vegas I filled up at the Nevada Landing. I don't remeber the Station's name but it's a HUGE gas station and I always put 91 octane.
You mean at Primm? There is a huge Chevron station there right at the CALI and Nevada border.

Costco gas is bad. We had trouble with it in all our Mercedes. Caused the check engine light to come on and hesitation/sluggishness too. Lots of gunk in their gas because they dont use Tier 1 gas. Switched back to Chevron and Shell and zero problems.

Most people who dont do a lot of driving that use Costco wont have problems but if you do a lot of long distance driving where the engine gets super hot then it will cause engine misfires and knocking.
 

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Mercedes 600 SE 1991 Oct.
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My V12 had a similar problem: 5 cylinders misfiring.
The local MB dealer could not fix the problem, MAF + ignition leads and rotors plus the main cables that have the usual wiring harness have been changed, but the problem remained.
I took the car to a repairman who is a car diagnostic specialist and he checked the spark cables and 5 of them were faulty. So these 5 will be changed to new ones, and perhaps this will solve the problem.
Another thing: when I had to drive 400 miles to get back home with the misfiring engine (7 cylinders were working correctly and the car did not go into stumble home mode) the car ate 0.5 litres of oil. When there was no misfiring, then there was no oil consumption either (not at even 4000 miles).

So about wednesday I get to know if the cable change solved the problem or not.
My car got ready today. The 5 spark cables have been changed, all the injector walves have been cleaned, and this solved the misfiring problem. The engine runs completely smooth, and the car has got stronger, it's great :thumbsup: , like an electric car :) It has taken one year to make it perfect, I bought the car 1 year ago, and nobody could solve the shaking engine problem, although the cause was so simple (some spark cables).
So i am happy now :givemebeer:
It will take some time to get used to it that I don't have to get frightened from the idle traffic situations anymore (red traffic lights, other stops etc.), because the idle is great.
 

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1998 Mercedes-Benz CL500
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Discussion Starter #15
My car got ready today. The 5 spark cables have been changed, all the injector walves have been cleaned, and this solved the misfiring problem. The engine runs completely smooth, and the car has got stronger, it's great :thumbsup: , like an electric car :) It has taken one year to make it perfect, I bought the car 1 year ago, and nobody could solve the shaking engine problem, although the cause was so simple (some spark cables).
So i am happy now :givemebeer:
It will take some time to get used to it that I don't have to get frightened from the idle traffic situations anymore (red traffic lights, other stops etc.), because the idle is great.
Congradulations! I hope I can same the same soon.
 

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1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
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Ordered a set of Beru factory wires and a new coil. Will install tomorrow after I pick up from my uncles shop. ~$300 bucks just for the parts. Hope this cures my cars ills.
 

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1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
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Just changed the ignition coil. Not that! Let car warm up for 15 mins. Stalled. Just keeps cranking and will not fire. Checked the spark plugs and non have spark. Changed spark plug wire from ignition coil to rotor with new one...tried again. Zero spark.

It is the ignition module on the drivers fender. That Bosch Black Box causing all the problems. Gotta wait until car is cool - about an hour before I can repark it. Big ass paper weight at the moment.

Also thought engine was leaking oil, but it wasnt. Tranny cooling line to the radiator is dripping. Will tackle that another day. Its getting damn cold and I need to repair my Kohler toilet.

Anyone know how much the Bosch ignition module costs? This item is not listed with autohausaz.com

I spoke with my mechanic in Las Vegas and he said locally they are $57-65 bucks used. You can bargain and have to make sure there is a guarantee for buying a used one. Too bad I am not in Vegas right now.

Glad to finally figure out what the hell is up with this S class. The old S class from 1990 never had any issues-zero! Died after 217K hard miles driven by my mom. Cant trust women when it comes to car maintenance. No offense to the chicks that do work on cars....
 

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1998 Mercedes-Benz CL500
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Discussion Starter #20
Ok guys here goes, I drove to Vegas last week and my on my way back my 98 CL500 suddenly went into stumble home mode and the check engine light went off and eventually started blinking. I thought it was the transmission at first so I took it to a shop that ran the codes and it came back saying the all the cylinders on the driver side are misfiring. I had no choice but to drive it home and on the way the car ate all its oil. Now today I replaced the spark plugs, to no avail. Next I switched the ignition coils around to see if it was possible that 4 of them were busted, they weren’t, again no difference. Then I replaced the cam shaft sensor, to no avail. As it stands now the codes still read misfires on all the driver side cylinders and I’m out of ideas. Also I can hear a loud knocking coming from the bottom of the engine. (Sounds like crank shaft… God I hope not.) Also did compression test and compression is fine. And ideas?
Finally had no choice but to take it to the dealer. They said I need a new engine and the quoted me $23K! Found a 97' M119 block from an older model for $1000.00 and now shopping around for someone to swap it. I'm so sad that my car my might cost too much to repair. No, not sad.. In despair, I swear this is the last time I buy a car I love.
 
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