Engine No Start

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smartdaddy2
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Engine No Start

Postby smartdaddy2 » September 17th, 2010, 8:45 pm

2006 cdi smart for 2.

Turn key on,everything normal,lights etc.

Turn key to Start position, engine cranks for 4/5 seconds then stops
but does not start engine.Wait a few minutes and try again, same result.

Go thrugh this routine 3 or 4 times and engine will start.

This is an intermitant problem.

Thxs almac
tolsen
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Re: Engine No Start

Postby tolsen » September 19th, 2010, 10:13 pm

Poor signal from TDC sensor due to bad contact or tip of sensor fouled with iron filings. Could also be fuel lift pump. The pump is audible for a few seconds when ignition is turned on.
Rides a Smart Cdi - 65 to 85 MPG.
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smartdaddy2
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Re: Engine No Start

Postby smartdaddy2 » September 21st, 2010, 3:30 pm

Thxs for your reply Tolsen.

Does the diesel have a TDC sensor ?
I thought diesels fired up on compression.

Mercedes has had my car for 24 hrs now but
of course it is starting normally for them.

Oh well, they have loaned me a new Cabriole
for the interim.

almac
tolsen
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Re: Engine No Start

Postby tolsen » September 23rd, 2010, 9:31 pm

The Cdi engine is not a conventional diesel engine but common rail diesel with electric mega expensive injectors. It is all controlled by an electronic control unit. TDC sensor is fitted on bell housing underneith high pressure pump. There is no separate cam shaft position sensor - most likely built into high pressure pump.
Perhaps the workshop ought to park your Smart outside in cold damp conditions to simoulate the fault.
Rides a Smart Cdi - 65 to 85 MPG.
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smartdaddy2
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Re: Engine No Start

Postby smartdaddy2 » September 24th, 2010, 1:00 am

Thxs again tolsen.
Mercedes has now had the car for 4 days now
and still no reply from them.
They had said they would be testing the
problem in early mornings.
There are no engne codes showing.
I will contact them tomorrow.
smartdaddy2
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Re: Engine No Start

Postby smartdaddy2 » September 26th, 2010, 12:09 am

Got my car back from Mercedes today.

They found nothing wrong with it.

Checked for fault codes - none.
Checked for fuel system leaks - none.
Checked actual values for rail pressure -
normal readings standing and at idle.
Checked for low side fuel supply pressure, key
on, 35 psi normal.
Checked actual values for Crankshaft Position Sensor - normal.
Pulled down Sam Control Module and checked fuel pump
connector is in good condition.
Battery tested good.
Tried starting after overnight and during day, started normal
every time.
WTF !!

Cost:
Diagnose = $136.50 ( wich may be returned if problem returns
and can be found and repaired under waranty ). I think this has
been handled in a fair manner.

This will close this topic until next time.

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