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Old 15-05-2014, 08:06 PM   #1
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Colleagues help issue with cold start!!! w168 A160

Hi guys I'm new in forum.Soon i bought A160 (w168) 1.6 gasoline,1999y.
(manual gears).
After almost an overhaul of the motor, remained a problem which it had previously.

When motor is cold cant start.
I need to turn over for 20-30 turns before it will start.
After hard start motor not support 1200rpm. Immediately go to down (800-900) and triet to off.
Once started whilst its warm the car starts first time.
And car work fine and accelerates are good.

My mechanic cant find whare is problem. I change and do those parts:

1.Diagnostic with MB star diagnosis. (Only lambda sensor appears)
2.All fiters (oil,fuell and air filters) are new.
3.Checked Mass Air Sensor + Throttle. Are work fine and clean.
4.My fuell pressure is 4.2bar.
5.Fuell injectors are new.
6.Coolant temperature sensor is new.

Tnx in advanced to all whos answer me.
My English is not very good if can explain me with simple words
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Old 15-05-2014, 08:52 PM   #2
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You may want to look at this guy's website---he is called LOFTY.
Albert Rowe, Lofty's homepageAlbert Rowe, Lofty's homepage[/url]
You might have a faulty ignition switch---- but it could easily be something else?
Bert Rowe's-mercedes-Benz 'A'-class info. Replacing Ignition contact switch.
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Old 15-05-2014, 08:59 PM   #3
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Could it be the crank sensor ?

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Old 16-05-2014, 04:03 AM   #4
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You may want to look at this guy's website---he is called LOFTY.
Albert Rowe, Lofty's homepageAlbert Rowe, Lofty's homepage[/url]
You might have a faulty ignition switch---- but it could easily be something else?
Bert Rowe's-mercedes-Benz 'A'-class info. Replacing Ignition contact switch.

I know this blog,its so much helpfull but cant find anything for cold start here.
Tnx
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Old 16-05-2014, 04:13 AM   #5
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Could it be the crank sensor ?

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Yes, maybe but if its from crank sensor then starts when he wants.
No matters motor cold on hot.

Any idea about: ECU? There have AIR TEMPERATURE SENSOR?

Revision and testing of a ECU / Airflowmeter from a Mercedes A-class - YouTube
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Old 16-05-2014, 10:43 AM   #6
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THE CAR DOES HAVE AN AIR TEMPERATURE SENSOR. Bert Rowe's-Mercedes-Benz 'A'-class information. Engine sensor locations Altho I doubt that has anything to do with your problem and you have already checked the coolant temperature sensor??? Your problem sounds like a mixture adaptation one where the engine is not getting a sufficiently fuel rich mixture when cold. This can be due to many factors - manifold leaks down-stream of the air mass sensor, insufficient fuel pressure, etc.

Don't know if your problem refers to starting in very cold conditions say in central Europe in winter but there is this blog from Russia??

Переводчик Google
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Old 16-05-2014, 02:28 PM   #7
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THE CAR DOES HAVE AN AIR TEMPERATURE SENSOR. Bert Rowe's-Mercedes-Benz 'A'-class information. Engine sensor locations Altho I doubt that has anything to do with your problem and you have already checked the coolant temperature sensor??? Your problem sounds like a mixture adaptation one where the engine is not getting a sufficiently fuel rich mixture when cold. This can be due to many factors - manifold leaks down-stream of the air mass sensor, insufficient fuel pressure, etc.

Don't know if your problem refers to starting in very cold conditions say in central Europe in winter but there is this blog from Russia??

Переводчик Google

Yes my coolant sensor is new.
With star diagnose not have option to set fuell portions for injectors.
As i said before i have new fuell filter and new injectors my cold fuell presure is 4.2 bar (this is maximum)

Is the problem can come from Mass Air Flow MAF Sensor or ECU?
If can, i saw any videos and in ebay some peoples do lifetime warnity tested
ECU`s.
What thay realy do?
I can make a video how my car dont want start. And no errors.
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Old 16-05-2014, 03:46 PM   #8
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As you know these cars have combined their ECU and MAF sensors together in one unit. This makes replacement very expensive and unless you have definite proof that this is cause of your problem I would hesiate to go down this path. You said you have inspected the MAF elements and they look OK?? Many firms that offer repairs merely replace the MAF element section. Usually a fault on the MAF/ECU unit will bring up the fault light on the dash which you have not mentioned.
I had another look at Lofty's site and came across this.
"Bert Rowe's Mercedes-Benz-'A'-class info"
this section in particular!!

Battery is good Engine turns over but Car Fails to start, after multiple tries eventually starts
A couple of owners, baby-benz.com members have had problems with starting, after a great deal of work on one members part he found that the problem was the starter relay which was failing to sent power to the fuel pump.
This fault which can be intermittent will not show up on diagnostics equipment.
If you suffer from the same symptoms then you can easily test to see if it is your relay at fault by switching over two compatible relays, The relay powering the fuel pump is K7
This can be switched with K10 which powers the rear screen heater. This at least will enable you to se if your problem is sticky relay contacts. Both of these relays are located on the main fuse board under the drivers feet. Fuse, Relay Chart
and Main Fuse Board Note that both are Black cased relays, Part no Relay (002-542-13-19) You will only be able to obtain the correct replacement from mercedes-Benz parts and the cost is approx Ј10.00 26/10/08.
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Old 16-05-2014, 10:01 PM   #9
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Sounds more like the cold start idle is not coming on.

Check/replace the coolant temperature sensor.
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Old 17-05-2014, 12:29 AM   #10
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Sounds more like the cold start idle is not coming on.

Check/replace the coolant temperature sensor.
Woops I see you have changed this already.

Make sure the wiring's ok from the sensor to ECU.
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Old 17-05-2014, 03:53 AM   #11
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Woops I see you have changed this already.

Make sure the wiring's ok from the sensor to ECU.
Come on guys, enough with this Coolant sensor,reading up.
Its not from coolant sensor. My new work normaly i measure it.

Did have any program or tool to see what happens with those injectors on cold start?
I still believe it MUST be programming like to see when injector starts a fuell,did it late or a enriched proportions or poor?
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Old 17-05-2014, 11:44 AM   #12
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Lamda sensors last around 100K and cause a variety of faults when screwed.
Fairly easy to change - but be sure an aftermarket replacement has the correct length cable.
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Old 17-05-2014, 12:06 PM   #13
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Did you swap the K10 and K7 relays to see if K7 is faulty?

Have you checked for a spark at the spark plugs on the cold start cycle?

Have you checked the fuel pressure under cold start cranking?

Have you checked all earthing from battery to chassis?

Have you the spare key?

Does the car start immediately and run on the cold cycle when using Easy Start/carb cleaner etc?
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Old 18-05-2014, 05:45 PM   #14
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Yes i try to swap the k10 and k7 and without result. Start from 4th turn.

Sparks are new and spark plugs too (Bosch)

Yes i have 4bars fuell presure

Yes battery is new,and all fuses are ok.

Yes i have the second key but the same problem.

I dont want to try with this any (sprays) because my ECU and flowmeter are together.
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Old 18-05-2014, 06:19 PM   #15
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Originally Posted by DimitarYanev View Post

I dont want to try with this any (sprays) because my ECU and flowmeter are together.
You know these are the cause of the low rpm problem on cold engines sometimes and possibly the problem with your cold starting, have you a unit to swap and test ?
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