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Renault Trafic 2.0 DCi 2007 - Poor cold starting #

Posted by Peter Holland on February 10, 2015, 5:36 pm

Year of Manufacture *: 2007
Engine Size and Code *: 2.0 DCi
( Optional ) Scanner Used: Tech 2
( Optional) Fault Codes: None

This vehicle has come in with a poor cold start fault. A diagnostics test has confirmed low fuel pressure under cranking. A sniff of easy start enables instant start and it will then run perfectly. It will then restart unless left for a few hours.

My first check was to carry out an injector leak off test, but to be honest, I'm never quite sure what is an acceptable level of leak off.

This one has yielded some interesting results. I can only test under cranking due to the amount that has to be stripped to access the injectors but I have found that 3 out of the four injectors fill my measuring tubes (as in the photo here) with in 8 seconds of cranking. No. 2 injector produces virtually nothing. Do I take it that the other 3 are faulty? or is there a problem with No. 2 and the others are ok?

I am but a simple electrician!

[img]http://s454.photobucket.com/user/sixappeal/media/e64d0331-8e20-4e28-af2f-782fe469dffb_zpso7qqoats.jpg.html]

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by george ambelas <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3245' width='330' height='300' border=0 style='border:none;'> on February 10, 2015, 8:15 pm, in reply to "Renault Trafic 2.0 DCi 2007 poor cold start. "
George Ambelas

a good injector should produce almost nothing or very little so it seems that you need 3 injectors

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on February 11, 2015, 8:59 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "
Mark Carter

They do appear to be high, before you condemn them have you proven that the non start is down to low rail pressure?

And if its a M9R Engine, good luck with getting them out

Modern cars, Its all wizardry and witchcraft

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Peter Holland <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5256' width='330' height='300' border=0 style='border:none;'> on February 11, 2015, 9:30 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "
Peter Holland

Live data shows actual rail pressure under cranking to be half of the desired figure. Once the engine is running they are both equal.

I'm not touching the injectors, I will farm that off to another garage customer of mine who is familiar with these luckily!

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Jarred Toms <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3794' width='330' height='300' border=0 style='border:none;'> on February 11, 2015, 7:14 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "
Jarred Toms

Where are you based? I can remove the injectors. Just one thing to check, when it won't start try pumping the priming ball when it's cranking and see if it starts.

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Glen Strachan <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat1463' width='330' height='300' border=0 style='border:none;'> on February 19, 2015, 1:41 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

Being done under an extended warranty these arent they ?

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Jarred Toms <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3794' width='330' height='300' border=0 style='border:none;'> on February 21, 2015, 12:41 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "
Jarred Toms

It covers up to 7 years old vehicles

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Tony Powell <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3923' width='330' height='300' border=0 style='border:none;'> on August 10, 2015, 12:49 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

Hi Guys

You are all missing one important thing here....

YOU CANNOT TEST THESE INJECTORS FOR RETURN QUANTITY

Tony

Specialist seized injector removal service

Link: injector and glow plug removal specialists

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Terry taylor <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5336' width='330' height='300' border=0 style='border:none;'> on August 10, 2015, 8:04 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "
Terry Taylor

We have a test bench,no back leakage on test.terry taylor

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by jarred toms <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3794' width='330' height='300' border=0 style='border:none;'> on November 2, 2015, 11:25 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "
Jarred Toms

How come these injectors cannot be tested for return values?

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Carl Ford <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1822' width='330' height='300' border=0 style='border:none;'> on November 3, 2015, 9:09 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

Because they are piezo.

Carl

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Glen Strachan <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat1463' width='330' height='300' border=0 style='border:none;'> on November 4, 2015, 8:01 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

I still dont understand why you cant carry out a leak off test on piezo injector ?
Can anyone elaborate ?

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Carl Ford <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1822' width='330' height='300' border=0 style='border:none;'> on November 5, 2015, 7:54 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

You need to measure the overflow pressure, if I remember correctly from my VSD15 course you CAN carry out a leak test but specific equipment will be required.

Carl

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Tony Powell <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3923' width='330' height='300' border=0 style='border:none;'> on November 5, 2015, 4:06 pm, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

Hi The injectors use up to a 10 bar return to ensure a fast refill of the injector ready for the next injection, the return flow has no consistency in quantity and therefore cannot be used as a guide as the readings obtained would be inconsistent and useless.

Link: A P Autodiagnostics ltd injector and glow plug removal specialists

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by jarred toms <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3794' width='330' height='300' border=0 style='border:none;'> on November 8, 2015, 7:22 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

So is this on all piezo injector? I only ask because there are kits on the market that state they support piezo leak off beacuse they come with a calibrated valve on the return circuit.

Thanks

Re: Renault Trafic 2.0 DCi 2007 poor cold start.

Posted by Tony Powell <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3923' width='330' height='300' border=0 style='border:none;'> on November 11, 2015, 8:27 am, in reply to "Re: Renault Trafic 2.0 DCi 2007 poor cold start. "

As far as i am aware only the ones with the 10 bar return

Link: A P Autodiagnostics ltd injector and glow plug removal specialists

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