OM606 electronic injection pump - Mercedes-Benz Forum
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#1 (permalink) Old 03-29-2010, 03:13 PM
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Post OM606 electronic injection pump

Hi all,

Does anyone know if the newer electronic injection pumps fitted to the later W210/OM606 Diesel Turbos incorporated fuel advance and retard hooked into the ECU?

Earlier W124/OM606 were fitted with purely mechanical injection pumps which were ideal for veg as you could advance the timing to compensate.

This guy uses some pretty long words, no idea what he is talking about

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#2 (permalink) Old 03-29-2010, 06:04 PM
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The computer for the OM606 only sets the rack position to adjust fuel delivery. The timing is still completely mechanical.
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#3 (permalink) Old 03-30-2010, 07:29 AM
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Thanks for the reply Matt,

Setting the rack position for fuel delivery, is this quantity or pressure?

I am I correct in thinking the timing is static on all models with the above Bosch inline mechanical pump?

Could you explain in a bit more detail
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#4 (permalink) Old 03-30-2010, 06:20 PM
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The rack position controls fuel quantity.

There is a mechanical timing device built into the chain sprocket, so while the timing is not computer-controlled, it is not static.
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#5 (permalink) Old 03-31-2010, 04:56 AM
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Quote:
Originally Posted by Matt L View Post
The rack position controls fuel quantity.

There is a mechanical timing device built into the chain sprocket, so while the timing is not computer-controlled, it is not static.
Good morning,

I have a 1999 E300 Turbo with a bad MAF. I do not have a wiring diagram but, after reading your advice can I assume that the ECU does not make adjustments to the mechanical pump. If so is that why I have not experienced any loss of power?? Thanks jhby
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#6 (permalink) Old 03-31-2010, 06:46 AM
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Quote:
Originally Posted by jhby@qis.net View Post
Good morning,

I have a 1999 E300 Turbo with a bad MAF. I do not have a wiring diagram but, after reading your advice can I assume that the ECU does not make adjustments to the mechanical pump. If so is that why I have not experienced any loss of power?? Thanks jhby
The ECU is responsible for setting the rack position, and thus the engine output. A bad MAF should put you into limp mode, with a severe power loss.
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#7 (permalink) Old 03-31-2010, 07:18 AM
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Agreed with Matt. This is why I wonder if you are driving with full power or if ther MAF is really bad.
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#8 (permalink) Old 03-31-2010, 09:03 AM
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Quote:
Originally Posted by Matt L View Post
The ECU is responsible for setting the rack position, and thus the engine output. A bad MAF should put you into limp mode, with a severe power loss.
All I know is that I get a P0100 fault(OBDII), MAF malfunction. I do not have any loss of power. The other interesting thing is that my work shop manual came and I am hard pressed to find anything in detail about the ECU and MAF!
Advice appreciated
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#9 (permalink) Old 03-31-2010, 04:14 PM
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Quote:
Originally Posted by Matt L View Post
The rack position controls fuel quantity.

There is a mechanical timing device built into the chain sprocket, so while the timing is not computer-controlled, it is not static.

Matt, is the "mechanical timing device built into the chain sprocket" common to all OM606's inc those fitted to the non turbo W124?

or is it a new feature fitted only to the turbo variants?
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#10 (permalink) Old 03-31-2010, 06:26 PM
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Quote:
Originally Posted by spock505 View Post
Matt, is the "mechanical timing device built into the chain sprocket" common to all OM606's inc those fitted to the non turbo W124?

or is it a new feature fitted only to the turbo variants?
It is not new at all. M-B IFI pumps have used this for decades. Perhaps from the very start.
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