Flaps

Markieboye

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Can some one please provide me with a description of what the flaps, in the inlet manifold, actually do and are they a form of VVT ??


TIA
Mark
 

turbopete

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i cant actually remember what the flaps do (what engine are you referring to? i presume 320 CDI or similar?) but they are NOT a form of VVT (AFAIK) as that usually stands for Variable Valve Timing
 
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Markieboye

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A-P, do you have any info on how the 320CDi (straight 6) controls the valve timing ?
 

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absolutely. it doesn't! no variable timing on any of the diesels that i am aware of.
 

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Fully controlled by the engine ECU!!
 

Alex Crow

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A-P, do you have any info on how the 320CDi (straight 6) controls the valve timing ?

perhaps you mean the flaps? no timing as such involved, just control of their positions as outlined in the link i posted above. controlled by the ecu as cole says.
 
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Markieboye

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Thanks.

I an still working on the DTC P1354, and have been told that it's to do with VVT on the engine. I couldn't find any reference to VVT for this engine, so I thought that I would ask the experts.
 

Alex Crow

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mark, what engine in which car do you have please?

i suspect you have the wrong code definition, it might be...

P1354 Synchronization between camshaft and crankshaft
--> The error will be stored within a few seconds.
--> The EPC control light does not light.
--> It is impossible to start the engine.
--> Pin Setup crankshaft: 1: Sensor Ground; 2: Signal
--> Pin Setup camshaft: 1: Sensor Ground ; 2: Signal ; 3: +12 V

--> Possible causes :

- Camshaft frequency to high
- RPM not plausible
- Camshaft Signal missing

what code reader are you using?
 
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Markieboye

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It's a w210 320Cdi (210226)
The code definition below is the one. I have had it connected to several, including STAR.
The thing about VVT was given to me by someone over the phone, who's suspose to be an expert in diagnostics.

To start with it would store that code each time the engine is started. Now it only stores it when I get to about 4000rpm (give or take a bit) as I have replaced the tensioner.
If you gently bring it up to that rpm range it's like a major mis-fire, but if it's a bit more 'foot to the floor' then the engine will cut back very abruptly and you get jerked forward n your seat.

It starts fine with no issues and drives smoothly and good mpg for an engine with 195000 miles

Mark
 

Alex Crow

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this does suggest a stretched timing chain. one thing that can happen on these diesels is failing high pressure pumps. they can get high internal friction which causes extreme cam chain loads, this in turn wears the chain badly. have you had any pump problems? it might be worth unbolting it and turning the drive spindle to check for binding or grating. also will be worth accuratley checking the valve timing to see if it is chain stretch. all this is a known issue on some cdi engines, as documented in wis.

the other thing that can cause this code to be logged is excessive cranking without starting, bear this in mind.
 
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Markieboye

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Thanks for the info A-P. It's surprising that you say that it's a known issue on some CDI engines, on WIS, as the dealer, that had the car for a day, didn't seem to know about that; or made no connection.

No known pump issues,

I'll get the pump off and check it out, and then get the static timing checked over.
If there is binding/grating, can they be serviced or better to get it replaced ?

Cheers
Mark
 

R7MFS

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Flaps!
The title caught my dirty little eye lol
Anyway, from experience ( from Vauxhall V6's in this case ) Flaps in the inlet are often used to provide long and short routes for the inlet air, a longer more "difficult" route for low rpms - boosting torque and a shorter " easier" route for higher rpm's providing more power, you probably wouldnt notice on a Merc, but on the vauxhall's you could feel a "boost" of power as the flaps switched positions. HTH
 

Alex Crow

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hello r7mfs, the mercedes 112 and 113 engines have exactly this feature, and i am glad to say these flaps are never any trouble at all.
 

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I did not know that I had flaps,,and yes,I have never seen a fault ever on the 112 113 so thats something that I do not have to get in a flap over
 

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