Renault traffic confirming injector fault help please

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Renault traffic confirming injector fault help please

Postby andrewbishop66 » Fri Sep 02, 2016 8:53 pm

Hi I'm looking at a Renault traffic with an injector problem it a friends vehicle

Engine code: M9R 780
(01-14)
2.0 dCi
84 kW (114hp) 3500 rpm
(2006-2010)

history

over the lat 3 months had intermittent hesitation and now and again would scan up injector 2 after the hesitation the vehicle would seem to have more power (?)

but nothing permanent

then we went to a miss on a regular occurrence hot or cold

now have a miss most of the time no fault code at the moment

this is the brilliant designed setup where the injectors get wet and they corrode into the block so we wont be removing the injector it will go to a specialist for that

I need to confirm the cylinder with the miss is no 2 or another

My plan is to measure engine speed via crank sensor process with maths channel to show dips in speed
use a reference signal from one of the injectors to confirm its injector 2

had planed a leak-back test but i would have to remove inlet manifold to connected up pipes and tubes

any suggestions from people gratefully received

Thanks Andrew
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Re: Renault traffic confirming injector fault help please

Postby STC » Sat Sep 03, 2016 11:10 am

this is the brilliant designed setup where the injectors get wet and they corrode into the block


Its all perceived doom and gloom with these, Timing Chains, Gearboxes & Injectors ...

I drive the same vehicle every day, same 2010 model M9R and 173k miles on it now - Good Van, I expect to get another 170k before I think about sacking it off.

It is not because the injectors get wet that they corrode into the head. My scuttle drains have been kept clean from day one and upon removing the plastic cover over the injectors it was bone dry in there, no evidence of water and the injector seal had not failed either causing blow by. Yet it took a specialist 3 hours with hydraulic apparatus to remove an offending injector. It snapped in 3 places on its way out.

That is 3 hours, plus I had to remove the scuttle, wiper mechanism, Airbox, its frame, Induction pipes, injector cover, manifold etc. before he arrived so he could hit the ground running.

I think that they are just a very tight fit, 2 different materials too close to each other and then put in an oven to bake, so to speak. Not unlike the Old Jaguars and Triumph Dolomites of yesteryear where the Steel Head Studs would weld themselves to the Alloy Head.

had planed a leak-back test but i would have to remove inlet manifold to connected up pipes and tubes

Indeed, No walk in the park! Any work on these vans seem to involve taking the front off or at least getting the Air Box and its frame out of the way. Indeed a PITA. Getting at the ECU involves removing 2 Shear Bolts.

Non Intrusive testing on these is a Non Starter :)

Moving forwards there will be Smooth Running Values for the injectors which will often give a clue.

Also note that Injector 1 will be a Flywheel end - or not dependant on Scan Tool.

CKP with a Math Channel riding on it will be as definitive as you can get, there is no option with these for Swaptronics. For a leak off test, which should be done although there is no short cut as you already know.

Whilst you have access you could do an insulation (internally short to ground) test with a Bosch FSA 050 or similar set at 100 - 150v. Yours will be an electrical/insulation fault as mechanical failure will normally throw a P0300, P0302 Misfire DTC.

These are notorious for Injector failure displaying the very symptoms you describe, and the other 3 injectors will quite likely fail soon - Domino effect.
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Re: Renault traffic confirming injector fault help please

Postby STC » Mon Sep 05, 2016 9:34 am

Just to add

A couple of tips the injector removal man gave me.
1. Don't try and pull it out yourself using slide hammers etc. - Ruins the threads etc. denying him a good hold for the puller - just makes his job harder & more expensive.
2. Slightly loosen the bolt to the offending injector
3. With the Plastic Cover off, soak the area around the injectors with penetrating fluid for a good few days and leave the engine running as much as you can to keep it warm.

None of that will get it to move but may make the difference between it coming out in one piece or him spending hours drilling & tapping - Considerably cheaper too!

Quite a few "Mobile" guys that will come out to you nowadays. I found this fella on ebay and have used him a few times now.
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Re: Renault traffic confirming injector fault help please

Postby andrewbishop66 » Mon Sep 05, 2016 7:57 pm

thanks for the advice hope to confirm injector tomorrow

thanks Andrew
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