E400 3.5 long crank HELP
Thread Starter
Newbie
Joined: Aug 2024
Posts: 2
Likes: 0
E400
E400 3.5 long crank HELP
Hi guys!
New member here, struggling and hoping for help.
I recently bought a 2015 E400, Uk Spec with the twin turbo 3.5 M276 with 62000 miles.
Since I bought the car, there has been an intermittent long crank with the engine. To the point where sometimes the vehicle won’t start first time, but it always fires up second time. It’s intermittent and only happens after the car is fully warmed up, and then cools down a little. Runs absolutely fine with no check engine lights or codes when checked on STAR.
So far the dealer has replaced battery, crankshaft position sensor, all 4 cam sensors, coolant sensor and they’ve done live diagnostics. All camshaft adjusters are within spec and the fuel pump has been tested and also works correctly.
The dealer has essentially given me two options, either give the car back for a full refund, to be honest I’d rather not do this as I love it and it’s a spec I’ve been looking for, for a long time. Option two is £1500 back from the dealer, who states they’re unwilling to put further time into the car as they’re just too busy (obviously not a MB Main dealer).
At this point I’m thinking are there any repairs that are likely to cost more than £1500 that the dealer hasn’t already tested for. I’m thinking it’s either going to be a super cheap repair and something’s been overlooked, or one of those massive pains that just seems to never get resolved.
Wondering what others would do in my situation.
If I do keep the car, I’m looking forward to getting to know you all on the forums.
Thanks in advance!
New member here, struggling and hoping for help.
I recently bought a 2015 E400, Uk Spec with the twin turbo 3.5 M276 with 62000 miles.
Since I bought the car, there has been an intermittent long crank with the engine. To the point where sometimes the vehicle won’t start first time, but it always fires up second time. It’s intermittent and only happens after the car is fully warmed up, and then cools down a little. Runs absolutely fine with no check engine lights or codes when checked on STAR.
So far the dealer has replaced battery, crankshaft position sensor, all 4 cam sensors, coolant sensor and they’ve done live diagnostics. All camshaft adjusters are within spec and the fuel pump has been tested and also works correctly.
The dealer has essentially given me two options, either give the car back for a full refund, to be honest I’d rather not do this as I love it and it’s a spec I’ve been looking for, for a long time. Option two is £1500 back from the dealer, who states they’re unwilling to put further time into the car as they’re just too busy (obviously not a MB Main dealer).
At this point I’m thinking are there any repairs that are likely to cost more than £1500 that the dealer hasn’t already tested for. I’m thinking it’s either going to be a super cheap repair and something’s been overlooked, or one of those massive pains that just seems to never get resolved.
Wondering what others would do in my situation.
If I do keep the car, I’m looking forward to getting to know you all on the forums.
Thanks in advance!
Senior Member
Joined: Jul 2008
Posts: 296
Likes: 65
2015 E400
I'd say take the money, especially since it's the spec you want. I have a 2015 E400 Cab US spec, but it wasn't the spec I wanted. It was low-mileage, still under factory warranty and a Cab. I had spent over a month looking for the spec I wanted, but couldn't find one for sale so I purchased it as a stop-gap. I stopped searching 3 months later. It's been six years now, and I've grown to love my E400 despite it being the wrong color and not having the P2 package.
I've never had a long-crank situation with it, but every now and then the keyless go will stop working, despite having fresh batteries in the keyfob, but it's always resolved itself. It's impossible to recreate the situation once it starts working again, so I've never bothered to look into it.
Regarding your long-crank situation, I'd take it to a MB dealer or independent MB specialist. Use the dealer rebate to pay for a proper diagnostic.
I've never had a long-crank situation with it, but every now and then the keyless go will stop working, despite having fresh batteries in the keyfob, but it's always resolved itself. It's impossible to recreate the situation once it starts working again, so I've never bothered to look into it.
Regarding your long-crank situation, I'd take it to a MB dealer or independent MB specialist. Use the dealer rebate to pay for a proper diagnostic.
Thread Starter
Newbie
Joined: Aug 2024
Posts: 2
Likes: 0
E400
I'd say take the money, especially since it's the spec you want. I have a 2015 E400 Cab US spec, but it wasn't the spec I wanted. It was low-mileage, still under factory warranty and a Cab. I had spent over a month looking for the spec I wanted, but couldn't find one for sale so I purchased it as a stop-gap. I stopped searching 3 months later. It's been six years now, and I've grown to love my E400 despite it being the wrong color and not having the P2 package.
I've never had a long-crank situation with it, but every now and then the keyless go will stop working, despite having fresh batteries in the keyfob, but it's always resolved itself. It's impossible to recreate the situation once it starts working again, so I've never bothered to look into it.
Regarding your long-crank situation, I'd take it to a MB dealer or independent MB specialist. Use the dealer rebate to pay for a proper diagnostic.
I've never had a long-crank situation with it, but every now and then the keyless go will stop working, despite having fresh batteries in the keyfob, but it's always resolved itself. It's impossible to recreate the situation once it starts working again, so I've never bothered to look into it.
Regarding your long-crank situation, I'd take it to a MB dealer or independent MB specialist. Use the dealer rebate to pay for a proper diagnostic.
Yeah to be honest this is my thoughts as well. My only concern is the dealer has actually identified the issue and knows the cost to fix and that’s why it’s suddenly not worth it. However from browsing the forums, not many M276 engines fail do they?
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
M276 is fairly reliable engine given fresh oil at 5kMi. It has a huge low-Rpm torque.
Your long crank sounds exactly like a fuel issue pressure is taking a while to build up.
The fuel tank has 2x fuel pumps
The engine has either 1x or 2x HPFP
I would look at running pressures with scanner.
Your long crank sounds exactly like a fuel issue pressure is taking a while to build up.
The fuel tank has 2x fuel pumps
The engine has either 1x or 2x HPFP
I would look at running pressures with scanner.
Last edited by CaliBenzDriver; Aug 23, 2024 at 08:17 PM.
