Help needed! C180 Kompressor 55reg W203 auto

[Arudge]

It will be very interesting to see what codes they come back with.

 

[Dave wood]

It will be very interesting to see what codes they come back with.

Indeed! Not long to go!

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[Arudge]

Any news?

 

[Dave wood]

Any news?

Ok so now I know what the issue is!
After being on a dyagnostic and with further investigation and having the codes the garage called Mercedes technical department with all 15 of the codes and it turns out that it is reading a positive negative! The wires are contaminated and sending shorts and mixed signals to sensors in which is causing an electrical misfire! And there was me thinking I had done something and couldn't place my finger on it, my my the frustration!! Lol.
So I am pleased to say that I can now move forward!

The issues around this contamination of the loom is that it can spread right through to the boot! YAY!

So now I have booked a well recommended sparky to come and have a look and tell me what's what, what needs replacing what dosnt and what he can or can't do!

New engine loom! No problem that's easy! But as the loom travles through the car and splits off the various components this is something that could be a problem!
But with the fella I have coming I see no reason as to why it can't be sorted!

Also on the positive side car passed mot with flying colours! Before the MOT was done I had to put on a front tyre, window wipers, and 2 number plate bulbs!
not bad for a 55reg C180!
Well looked after!

I will keep you updated as to what has happened to the loom system and where theses shorts branched to!





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[star]

Ok so now I know what the issue is!
After being on a dyagnostic and with further investigation and having the codes the garage called Mercedes technical department with all 15 of the codes and it turns out that it is reading a positive negative! The wires are contaminated and sending shorts and mixed signals to sensors in which is causing an electrical misfire! And there was me thinking I had done something and couldn't place my finger on it, my my the frustration!! Lol.
So I am pleased to say that I can now move forward!

The issues around this contamination of the loom is that it can spread right through to the boot! YAY!

So now I have booked a well recommended sparky to come and have a look and tell me what's what, what needs replacing what dosnt and what he can or can't do!

New engine loom! No problem that's easy! But as the loom travles through the car and splits off the various components this is something that could be a problem!
But with the fella I have coming I see no reason as to why it can't be sorted!

Also on the positive side car passed mot with flying colours! Before the MOT was done I had to put on a front tyre, window wipers, and 2 number plate bulbs!
not bad for a 55reg C180!
Well looked after!

I will keep you updated as to what has happened to the loom system and where theses shorts branched to!





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Oil is the most common one, from the cam actuators. It would be hard for it to travel throughout the car, as it only contaminates the engine harness ( which is only in engine bay) Unless the engine control unit is full.

Was this misfire present before with the old engine?

 

[Arudge]

Slow down a bit......

You've got oil in the loom. As Star has stated, the distance the oil can travel is limited and largely only effects the engine loom.
The oil doesn't cause shorts, quite the opposite. The oil is a dialectic, an insulator, it tends to cause problems at the connectors. The main connector is the one connecting the loom to the engine ECU. Find it, pull it off and tell us what you find, if anything.

 

[LostKiwi]

As Andy says.
The oil being an insulator causes s floating signal to the ECU from the sensor. The ECU then has to guess what to do, gets conflicting data so gets it wrong causing the misfires.

 

[star]

The engine loom is separate from the main body loom and only connects at the engine Ecu at different plugs. Oil in the loom generally throws up a lambda fault as the oil pools at the lowest point which is the lambda sensor.

 

[Oldspanners]

I had oil in the wiring loom on my C180 W203 and cleaned the connector at the after cat O2 sensor and ECU plug (not the ECU) several times with electrical contact cleaner and compressed air as it was causing fault codes but not a misfire. The cure was to fit new cam magnets and blockers to the wiring harness and clean the connectors as I've said.

 

[Arudge]

I had oil in the wiring loom on my C180 W203 and cleaned the connector at the after cat O2 sensor and ECU plug (not the ECU) several times with electrical contact cleaner and compressed air as it was causing fault codes but not a misfire. The cure was to fit new cam magnets and blockers to the wiring harness and clean the connectors as I've said.

I also had the same on my W208, I found a lot of issues and sorting those issues all helped improve things but not fully cure them. I had oil I the loom but the main culprit was a vacuum leak. The icing on the cake was the new cam chain.
No more misfire.

Oldspanners, Did you cure your misfire?

 

[Oldspanners]

I also had the same on my W208, I found a lot of issues and sorting those issues all helped improve things but not fully cure them. I had oil I the loom but the main culprit was a vacuum leak. The icing on the cake was the new cam chain.
No more misfire.

Oldspanners, Did you cure your misfire?

The problem I had was just fault codes, the MIL and bad mpg as I said. The first manifestation was a faulty O2 heater circuit and changing the sensor obviously cleaned up that connection for a while, when the problem came back a few thousand miles later, I went off looking at the MAF etc. but when I checked the O2 connector and the ECU there was signs of oil. So fortunately changing the cam magnets, adding the blockers and cleaning several times both connectors with contact cleaner and compressed air sorted it. I bought a new Bosch O2 sensor thinking the other one would be shot but I didn't fit it as I was waiting until all the oil was at the bottom but cleaning worked and it's still in the box.
The cam gears and chain are still a worry as the engine has now about 66K miles but I don't do many miles here so keeping good oil condition should help until I can pick up enough courage to have a look.

 

[Dave wood]

There was no issues with the misfire in the old engine but on an occasion it would jump into limp mode! When it happened the first time I got the car home got some tools out to start looking for the issue. Started the car up and the issue was gone! So looked around couldn't find anything, the issue was gone so forgot about it! Then it happened again and again! I could never find anything. I had dyagnostics plugged in but again nothing was found! So as u can imagen it was like chasing a ghost lol.

So going back a little when the car went bang on the M25, as a result of the bang There was a hole in the block and as u can imagen the oil came out and went everywhere. I have pictures and will try to upload for you to see.

This could possibly be the source of the issue!

I will eliminate 1 thing at a time and do everything you have advised me to do and hopefully somewhere along the line I will locate what's happening.

Again I am so appreciative of your
help.

I'll keep you posted on my progress!

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[Dave wood]

Also forgot to add that I've got warning coming on on my OBC!
I have an alternator warning telling me it's not charging the battery! Rear left number plate build warning!
And the obvious one is still there (engine management)

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[Dave wood]

So this is the hole from the result of the bang!

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[Arudge]

Tasty.

 

[Dave wood]

Tasty.

The hole was so big and given that there was plenty of lube 3 fingers slid in with ease!

It has left me scared and has certainly been a learning curve for me although I have to say it's one of the biggest holes I've seen!

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[LostKiwi]

That looks like it's a conrod popped out the side?

When I used to be involved in Motorsport saw an Escort engine where the rod had almost cut the block in half...

Reminds me of an interview with a local top driver in NZ called Mike Marshall....
" So Mike we see you've retired from the rally. What was the problem?"
"Electrical problems".
"Really? They must have been bad for you to retire?"
"Yeah, starter motor fell off."
"Surely that's not serious enough to make you retire?"
"It is when the conrod knocked it off!"

 

[star]

That’s a nice hole but the oil wouldn’t contaminate the loom to affect anything, it would only sit on top of the insulation.

 

[Oldspanners]

When I was involved in Rallycross I told the driver/owner the engine was due a rebuild but he said it was alright for another meeting. After two laps of the first heat the engine went BANG! when the car coasted into the paddock I lifted the small end of one cylinder off the sump guard and deposited it a plastic bucket of water where it still managed to leave its imprint.

 

[Dave wood]

Right ok so now I am very curious!
And now I'm thinking timing chain! PERIOD!

SO THIS IS WHAT I HAVE DISCOVERED!

I had a friend's brother who left a job to come and put his snap-on dyagnostics onto my car and here is what was found!...

P200C. L5 crankshaft position sensor
P201C. Mixture format self adapation (fuel trim)
P2023. Manifold pressure sensor (B28)
P202B. CAN message from electronic ignition system module
P2062. Alternator dyagnostic 3.

He cleared all codes started the car run it and then only 3 codes popped up. Crankshaft sensor, manifold pressure sensor and alternator.

So I have a new cam magnet here as this was bough for the old engine! Reason being was my engine managment light can on before the chain slipped the firstime round and the dyagnostics told me it was bank 1 crankshaft position sensor so I bought and replaced but still the issue was there! Then after this the timing chain slipped and all my troubles started.

Anyways I then find out after that it is common that when the timing chain is on its way out it shows as a crankshaft sensor!(Always the way)

All of sudden (DEJA VU)!!

So I changed over the manifold pressure sensor and crankshaft sensors 1 at at time starting the car between with no change.

So what have we learnt today boys and girls?

Well I learnt that not all mechanics are competent in reading codes properly! Today I also learnt that when my nearly 2 year old punches me in the nuts I know what to expect pain wise!

I'll put pics up of dyagnostics and alternator check for ur viewing and advice.

So any thoughts?? Lol



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