First snag.

Page may contain affiliate links. Please see terms for details.

Moultoneer

Active Member
Joined
Jan 7, 2019
Messages
121
Location
durham
Car
CLK320
Well, that didn't take long. Anyone that saw my thread "looking for a comfortable cruiser" might have noticed that I settled for a CLK320, bought 2nd of March.

I drove it from London down to Pompey where it didn't do a great deal until my 1st trip back up to Durham a couple of weeks ago. So far, so good, and all very enjoyable.

Anyway, Good Friday started the journey back down south by stopping off at Harrogate for a couple of days. Then, Sunday morn, drove a few miles to a nearby reservoir for a swim. It was on returning to the car after my swim that the first snag appeared.

The car wouldn't start. It would just crank and crank and crank. Now I know, some of you are already shouting out the answer but this was all new to me. I felt in a bit of a fix because although I wasn't too far from my cousin's, where I was staying, I didn't have my phone with me, and besides, it was going to be very embarrassing, my new shiny Merc breaking down already!

Well, after sitting a while and several attempts, it fired up so I was able to get back, but noticed the engine light on. The hand book gave a fuel system fault but it sounded and ran OK. Would it be OK for the drive back to Pompey I was planning on doing later that afternoon though?

An hour or so later I went out and tried it and it fired straight up and the engine light was now off. Of course I now wanted to believe that it had been some odd glitch and that everything was hunky dory again. So, about 1500, I set off back to Pompey. The weather was glorious,I didn't expect too much traffic and was really looking forward to the drive.

I got about 5 miles when the engine died. I turned off the main road and sat there in silence. Tried it and cranking but no starting. Shit, shit, shit! At least I had my phone this time so I had to rummage about for the details of my breakdown cover. My Cousin's husband is a mechanic but for the reasons mentioned earlier I didn't really want them to know that I was having problems.

I ring the breakdown people and have a bit of a dilemma as to where to get recovered to. I'm heading to HMS Sultan, but if the car is knackered it need to be at a Merc garage.

Whatever, I'm told that someone is on there way and would be with me within the hr. My phone is bleeping with an incoming call as I'm being told this, and when I check it is the recovery bloke. I explain where I am and then try the car again, which now starts. I ring him back and tell him, and add that the engine light is back on.

He turns up within about 5 mins and plugs his machine into the car. I probably don't need tell you what it said, "crank position sensor". He turned it off and re-started it and re-set the fault. No engine light. I make the decision to continue the drive and, after a really nice drive get all the way to the A27, 6 or 7 miles from where I was going when it cut out again.

Not such a good place this time though, on a stretch of dual carriageway with no hard shoulder, so it's 2 wheels up on the verge. I pop the bonnet to help it cool down and ring the breakdown people again. Then, just after they had arranged another mechanic it started. I headed off and cancelled the recovery. Got to within a couple of miles of Sultan when it stalled again.

Another 10, 15min wait and I'm off once more. Got to Sultan and drove to the accom block. dropped my stuff off and went to take the car over to the CP. Wouldn't start. Wait 5 mins and it does. I have to stop outside the gate to swop the car pass over, (the CP is over the road in another section.) Car won't start. 15-20mins this time but start it does. Make it to the CP and it stalls just in front off a parking space. Made it!

But now I'm thinking that I have the problem of getting the car up to a Merc specialist, the nearest being Silver Arrow at Titchfield. However, this morning I've been on-line and replacing the CPS doesn't look too difficult. If I invest in the right tools it looks like I should be able to do it for £50-60, depending on the cost of tools.

What do people think, is it a DIY job? If I manage to replace it do I need a machine to re-set everything? There is no panic as I won't need the car for a couple of weeks at least.

Cheers,

LG.
 
This Video might help. FAST FORWARD TO 2:50mins. as the guy waffles a bit up until then. (Sorry).
To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.
It's a real bitch to get to! and in the Video he really doesn't show the position of it. But as you face the Engine it is right at the back on the right side almost down towards the Bellhousing. It has a single Cable Connector. You will need a long extension with a no.8 Torx Socket. Using 1/4" tools make it easier due to constraints of location. Getting the Maf removed is more difficult than it looks aswell. It is only really removed to aid using your left hand to hold and locate the Torx Bolt.
Give yourself at least an hour+. ;) Also look at other videos as it helps with the actual location.

Good luck.
 
Was it a private purchase ?

At well under 3 months, I would expect any dealer car to still be in warranty?
 
Mmm, not sure about the dealer angle. I expect him to say that he was selling it "on behalf" of the previous owner. Plus, he's up in London. As for doing the job, it ought to be within my abilities. On the plus side, I have small hands. The downside to that is that they aren't the strongest of fingers for prying off clips/undoing connectors.

If I do it on the CP at least there would be no constraints on swearing. I am though, going to investigate the car club here. They should have all of the tools required.

Any particular brand/make of CPS I should get?

Cheers, LG.
 
I expect him to say that he was selling it "on behalf" of the previous owner

It doesn’t work like that. The law is pretty clear on traders responsibilities.

If you do the job yourself, just buy the CPS from MB. It’s not that expensive.
 
I second the CPS from Mercedes.... Not sure about a Dealer local to you but the Mercedes Dealership in Eastleigh, (Marshalls) is really helpful. If you can speak to Karen, she always chucks me discount on parts - especially on older models..... Number is 02380 619044. You are more than welcome to mention my name, Bill, the chap in Bursledon that is always bothering her...lol....... (For spares). :)

And on another note, if you are around and about a few of us are having a little GTG on the 5th of May. Hampshire GTG. - Sunday 5th May 2019 - Hampshire Bowman Pop in of you can.

Seeya.
 
First time? Only time, I hope! I wouldn't want to become an expert at it. Getting it to a dealer might be an issue now. I'm sure it will start 1st time but how long it would run for might be anybodies guess. No, I might have to bite the bullet and do it myself.

Having said that though, is there any re-coding to be done afterwards? That might be a massive fly in the ointment.

And on another note, if you are around and about a few of us are having a little GTG on the 5th of May. Hampshire GTG. - Sunday 5th May 2019 - Hampshire Bowman Pop in of you can.

I'd try and get to that, although I've just heard that we may be getting another week off around that time. Apart from anything else, that puts a bit of pressure on me sorting the car out. It would be have to be done this coming weekend.

Think I'll give Newcastle MB a ring tomorrow. they seem to often get good chuck ups for their prices.

LG.
 
Hi. No, just change it and away you go..... A bit like changing a Spark plug really. Although you don't want to be doing that on these motors! Even worse than changing the CPS!!! You have to loosen the mountings and ra8ise the engine slightly to get to the back ones.... A right schlep!

I've had 2 clk320's but the w208 - basically the same engine.

Concerning the GTG at the Plowman, the chap organising it has a clk320, also lives in Gosport.
If you are set on taking it to a shop to get it fitted I would go to PCS in Horndean, not far from Gosport really. Ollie is a first class bugger and knows his stuff!

Mercedes Benz & Smart Specialists | Prestige Car Service | Horndean, Hampshire

Good luck!
 
Just had a quote from MB Newcastle. £123 plus VAT. Seems expensive considering that they seem to go for around £35 on-line.

LG
 
(Sorry).
To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Give yourself at least an hour

An hour to regain your composure?
At 7m 20s in the vid the guy lifts out the CPS as if he'd left it laying there earlier. They can be an absolute sod to remove and frequently end up having to be knocked through and the gearbox removed to retrieve.
You might be lucky, but expect it to be awkward and allow plenty time.
 
I'm afraid I didn't edit the Video or have anything to do with its production. That is why I do mention to look at other videos that show the location and removal better.
I just posted it to show more or less the procedure.
But as far as the fact that they frequently have to be "knocked-through" is a first I have ever heard of such a thing happening!
And yes it is awkward, but with the right tools and knowledge an hour plus is ok for a novice. My local mechanic charges 30 minutes Labour to do it - £25.00
 
Maybe geography makes a difference. If you live somewhere where the roads are heavily salted in winter....
 
I probably don't need tell you what it said, "crank position sensor".
LG.

Crank position sensor failures are not an MB-specific thing. Over the last few years I have had them fail (sometimes more that once) on my first and second C43 and on my first E500. But also on the OH's Clio - several times on that but as she's had it since 2004 it's not surprising.
 
Can anyone confirm that this looks like the right one? It says it fits a CLK320:

MERCEDES RPM / Crankshaft Sensor Bosch A0031532728 A0031532828 A0031538628 New 3165141821055 | eBay


LG.

The CPS is common across a wide range on Mercedes engines - this one apparently also fits my S500 V8.... The only difference I am aware of is that sometimes they can have a different connector - one has a single clip fastener on the wide side the other type has 2 on either side of the narrow ends.

I was checking on some other Parts Finders and this P/N is correct; (With a Single Clip on the one wide side). 003 153 28 28 | 003 153 27 28 | 651 905 00 00 as far as I can see....

This product fits 371 vehicle variants.
Mercedes-Benz: 44 models, 371 variants between 1998 and 2015. So if it doesn't fit yours, you'll be pretty unlucky!
 
Last edited:
Mercedes-Benz: 44 models, 371 variants between 1998 and 2015. So if it doesn't fit yours, you'll be pretty unlucky!

Mmm, I normally am! Thanks for checking though.

Crank position sensor failures are not an MB-specific thing.

As it happens, I do have experience of a CPS failure in the past on my Citroen CX, (which, if I remember, has 2.) Same symptoms of course, engine stalling in the most inconvenient/embarrassing place and then, after a little sulk, it starts to get you a bit further. I did that one myself. On the plus side, access was excellent. Which was lucky, because, on the down, I had to drill it out. Let's hope this one isn't as bad as that!

I haven't yet ordered the new one or the tools required but I'll have to do so tonight if I want to have a crack at it at the W/E.

Watch this space!

LG.
 
Mmm, I normally am! Thanks for checking though.



As it happens, I do have experience of a CPS failure in the past on my Citroen CX, (which, if I remember, has 2.) Same symptoms of course, engine stalling in the most inconvenient/embarrassing place and then, after a little sulk, it starts to get you a bit further. I did that one myself. On the plus side, access was excellent. Which was lucky, because, on the down, I had to drill it out. Let's hope this one isn't as bad as that!

I haven't yet ordered the new one or the tools required but I'll have to do so tonight if I want to have a crack at it at the W/E.

Watch this space!

LG.

I've never had the unfortunate pleasure of a Crank Sensor playing up, but I did have the Cam Position Sensor go on the blink on my Rover 75 V6. It wouldn'd conk out but it would not start sometimes. The usual trigger was if you stopped and left it standing for between 10 minutes and about an hour. It would just crank and crank but no fire. Leave it for another 10 - 20 minutes and it would be fine.

It is basically a magnet that "sees" that the Camshaft is turning thereby sending a signal to the Fuel ECU to send fuel to the injectors. But of course when the Sensor gets hot after getting hot from a turned off engine it apparently changes the magneticity and refuses to see the Camshaft turning - hence no fuel. Let it cool down a bit, and all is fine.

Luckily it is really accessible and is literally a 2 minute job! I just replaced it with a good one free out of a Rover 25 1.4 (same Sensor) and then got another good one that I kept in the Boot just in case.... :D But never needed it.

But it was similar to you, I had only had the car for about 2 weeks when this happened, which sent mer into a panic until I learnt what it was and that it was quite a common occurrence.

Anyway, after that it gave me 6 years of trouble-free motoring until I sold it on. And to honest after my '98 Avensis, which gave me 14 years of trouble-free motoring, was the most reliable car I've ever had!
 

Users who are viewing this thread

Back
Top Bottom