leeroytandy

Hi Guys,
I drive a 2002 C270 CDI,
Recently the car switched off while accelerating. and would'nt start afterwards. Had to use a cloth dipped in petrol to get it started.

The mech replaced injector № 5 (2ⁿᵈ hand) it then started but now it takes about +\-5 tries before it starts. I've noticed that it starts ok in the morning.
It doesn't smoke when accelerating so i don't think it could be the injectors. it doesnt cut out when i floor it and power still seems to be good.

PLEASE HELP!!!!

mersum1es

Cam position senor? Crank position sensor?

It still could be fuel related, is there visible air bubbles in clear pipes? Often pipes brittle when doing some other repair. Do the injector leak test. Fuel problems are often temperature related. If you can plug it in star, you can see fuel pressure, read possible codes, check injector correction values etc.

All tests should be done in exact condition where problems occur!

Plutoe

First, I think you have to go back to the shop that installed the used injector and determine if he first used the correct injector(same iqc)(see wis) and two did he then adapt the used injector to the CDI control unit(see WIS)---if not----above the equator we call that a FU!!

leeroytandy

Thanks for the advice guys,
My Mech is generally more acquainted to sprinter Buses/vans then he is to sedans which use the same 611 motor(could be different in other countries). I think the difference between the 2 is that the sedans are more electronic than the commercial vehicles.

He doesn't have a diagnostics system. So before replacing the injector he did the overflow test which showed that № 5 had more fuel than the others and therefore replaced that one. I didn't know that it has to be adapted to the rest of the car. I assume this means putting it on the computer and reseting the values ??
all the injectors have the same part numbers. would that mean they're the same?

I noticed the at night it starts much quicker than it did during the day. My logic says its most probably the crank sensor and/or the fuel filter.
I had replaced the fuel pipes so i can't really see whether there's air bubbles in the system. There is a sought of spraying sound i hear when i turn the key on, but dont see any leak anywhere. is it possible for the Primary pump to leak into the engine??

In fact in the previous months i've replace quite a bit concerning the fuel system (4 2nd hand injectors, refurbished HP pump, Air Mass Sensor, fuel Pressure regulator, Turbo Actuator, installed electronic pumps in the tank & bi-passed pick pump on the engine.

mersum1es

Ouch, have you had continuously troubles with starting before, or why such amount of part changed?

You really should get your car in place where star diagnostic tool is used (by skilled mechanic), no point to throw money to new parts... and yes, injector need to be coded to ecu, they have either 1-digit or 6-digit IMA coding (codes found in top if the injectors)...

leeroytandy

Well the 1st mech had a star diagnostic system and he replaced too many things at the same time, so i felt he was taking me for a ride. and therefore went to the 2nd mech who has so far not dissapointed me. the starting issue is 2days old now. i.e after he replace the 5th injector. reason he replace it was because when flooring it, it would switch off.

so now it doesnt switch off but instaed take forever to start.

leeroytandy

will try taking it to someone tomorrow to code them and then see what happens

leeroytandy

Hi guys
It turns out that its was the Fuel pressure regulator.
The FPR has seals on it, that need replacing after some time. what happens is that they leak and the preasure takes a long time to build up.

So before replacing it, check the seals

http://www.mbpartsworld.com/showAsse...=0&modelYear=0

on the diagram its parts № 14 -Preasure regulator
Parts № 15&16 -the seals.

thanks guys for all the suggestions

mersum1es

Nice you got it sorted (and I was 'right' about pressure problemssorry just didn't posted all regular culprits, pressure regulator and o-rings are one of them...)! How you found it?

leeroytandy

Wend to MB to buy a service kit, then asked to speak to their Diesel Mech.
Told him what i was thinking it was and he said more often than not, its the seals on the Regulator.

The crank & cam Sensors almost never pack-up. with diesels its almost always the fuel system.