CPS replaced engine cranks no start, popping noise.
Thread Starter
Junior Member
Joined: Feb 2017
Posts: 20
Likes: 0
From: Liverpool, UK
2006 CLK 200k Cabriolet
CPS replaced engine cranks no start, popping noise.
Hey Guys, I'm really struggling with my CLK at the moment. Wednesday night car ran really rough and engine light came on, ran the codes p0366 came up, thought ill order CPS online and replace, Thursday morning just about to do 10min school run, went to start car cranked long time did not start, so thought leave it order new cps. Installed new cps Friday went to start car and same problem, cranks but will not start. I've checked all fuses and relays for starting, tried jumping battery and no change.
Here's a video of it trying to start:
Really grateful of any advice you can give and view the video see if it's something you have encountered before? Like with all our cars this is keeping me awake at night thinking the worst
I'm going to get it booked in a garage this week so I'd like to have some idea what's facing me.
Thanks for viewing my post
Kris0003
Here's a video of it trying to start:
Really grateful of any advice you can give and view the video see if it's something you have encountered before? Like with all our cars this is keeping me awake at night thinking the worst
I'm going to get it booked in a garage this week so I'd like to have some idea what's facing me.
Thanks for viewing my post
Kris0003
Last edited by Kris0003; Feb 19, 2017 at 11:15 AM. Reason: Forgot to add, cleared code after installing new CPS, no codes are showing now.
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Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Check fuel pressure at the Schrader valve on the front fuel rail that connects the injectors to one another. Should be > 3.8bar or 55psi while cranking.
To start require:
1) Start enabled via EIS etc.
2) Fuel
3) Air
4) Spark at the right time.
https://mbworld.org/forums/c-class-w...t-process.html
To start require:
1) Start enabled via EIS etc.
2) Fuel
3) Air
4) Spark at the right time.
https://mbworld.org/forums/c-class-w...t-process.html
Last edited by Glyn M Ruck; Feb 19, 2017 at 11:42 AM.
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2002 C32AMG
Thread Starter
Junior Member
Joined: Feb 2017
Posts: 20
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From: Liverpool, UK
2006 CLK 200k Cabriolet
Thanks all for the replies so far. Quick update - new cps is Bosch direct replacement for the Oem one I took out. My sister has the slk with m271 engine and exactly same cps I removed from mine so tried her cps in mine and the same result - crank no start. I've charged the car battery overnight as the cranks had left it on its last legs, I'm just waiting on a fuel pressure test kit now, once delivered will test the schrader valve.
I've also took back seat out so I can hear the pump engage well the few second hum you hear. Can that still make this noise if broken, what sort of faults can it be if the pumps okay?
I've also took back seat out so I can hear the pump engage well the few second hum you hear. Can that still make this noise if broken, what sort of faults can it be if the pumps okay?
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C63s
Thanks all for the replies so far. Quick update - new cps is Bosch direct replacement for the Oem one I took out. My sister has the slk with m271 engine and exactly same cps I removed from mine so tried her cps in mine and the same result - crank no start. I've charged the car battery overnight as the cranks had left it on its last legs, I'm just waiting on a fuel pressure test kit now, once delivered will test the schrader valve.
I've also took back seat out so I can hear the pump engage well the few second hum you hear. Can that still make this noise if broken, what sort of faults can it be if the pumps okay?
I've also took back seat out so I can hear the pump engage well the few second hum you hear. Can that still make this noise if broken, what sort of faults can it be if the pumps okay?
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Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Thanks all for the replies so far. Quick update - new cps is Bosch direct replacement for the Oem one I took out. My sister has the slk with m271 engine and exactly same cps I removed from mine so tried her cps in mine and the same result - crank no start. I've charged the car battery overnight as the cranks had left it on its last legs, I'm just waiting on a fuel pressure test kit now, once delivered will test the schrader valve.
I've also took back seat out so I can hear the pump engage well the few second hum you hear. Can that still make this noise if broken, what sort of faults can it be if the pumps okay?
I've also took back seat out so I can hear the pump engage well the few second hum you hear. Can that still make this noise if broken, what sort of faults can it be if the pumps okay?
Yes the pump can still run but not produce enough pressure if the filter on it's intake is clogged. Your car is right at changeover point. You might have an in tank filter or an external filter that contains the pressure regulator.
You are going to have to check whether or not you have an external filter.
Don't fill the car up if you have an in tank filter or you are going to have to drain some fuel before removing the pump/level sender unit to replace the in tank filter.
Thread Starter
Junior Member
Joined: Feb 2017
Posts: 20
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From: Liverpool, UK
2006 CLK 200k Cabriolet
Yes the pump can still run but not produce enough pressure if the filter on it's intake is clogged. Your car is right at changeover point. You might have an in tank filter or an external filter that contains the pressure regulator.
You are going to have to check whether or not you have an external filter.
Don't fill the car up if you have an in tank filter or you are going to have to drain some fuel before removing the pump/level sender unit to replace the in tank filter.
You are going to have to check whether or not you have an external filter.
Don't fill the car up if you have an in tank filter or you are going to have to drain some fuel before removing the pump/level sender unit to replace the in tank filter.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Your car could be either. They changed from external to in-tank in 2006. If it's external you should see it above & at the rear of the LHS of the saddle tank behind the LHS drive shaft to the wheel. If in-tank it is in the sender unit with the pump under those round covers under the back seat.
Thread Starter
Junior Member
Joined: Feb 2017
Posts: 20
Likes: 0
From: Liverpool, UK
2006 CLK 200k Cabriolet
Check fuel pressure at the Schrader valve on the front fuel rail that connects the injectors to one another. Should be > 3.8bar or 55psi while cranking.
To start require:
1) Start enabled via EIS etc.
2) Fuel
3) Air
4) Spark at the right time.
https://mbworld.org/forums/c-class-w...t-process.html
To start require:
1) Start enabled via EIS etc.
2) Fuel
3) Air
4) Spark at the right time.
https://mbworld.org/forums/c-class-w...t-process.html
In the process of elimination what is next for me to check when the car is still not starting but cranking?
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Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
If the aircleaner is not clogged solid & you don't have a blocked Cat I agree with you Rodney. This car has the M271 engine so it's coil on plug. No coilpacks to fail, only single coils & then you would get a 300 misfire code. My worry is that the timing chain might have jumped that is so common on this engine if you don't listen to them carefully & react immediately you hear a slight rattle at cold start that shuts up the minute the oil pressure rises.
Kris ~ how many miles has the car done? Are you able to do a compression test on all cylinders?
I sincerely hope I'm wrong but that engine is making weird induction noises while cranking. Once the valves are bent they will crank over just fine.
Kris ~ how many miles has the car done? Are you able to do a compression test on all cylinders?
I sincerely hope I'm wrong but that engine is making weird induction noises while cranking. Once the valves are bent they will crank over just fine.
Thread Starter
Junior Member
Joined: Feb 2017
Posts: 20
Likes: 0
From: Liverpool, UK
2006 CLK 200k Cabriolet
If the aircleaner is not clogged solid & you don't have a blocked Cat I agree with you Rodney. This car has the M271 engine so it's coil on plug. No coilpacks to fail, only single coils & then you would get a 300 misfire code. My worry is that the timing chain might have jumped that is so common on this engine if you don't listen to them carefully & react immediately you hear a slight rattle at cold start that shuts up the minute the oil pressure rises.
Kris ~ how many miles has the car done? Are you able to do a compression test on all cylinders?
I sincerely hope I'm wrong but that engine is making weird induction noises while cranking. Once the valves are bent they will crank over just fine.
Kris ~ how many miles has the car done? Are you able to do a compression test on all cylinders?
I sincerely hope I'm wrong but that engine is making weird induction noises while cranking. Once the valves are bent they will crank over just fine.
