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Renault Espace 2.2 dci

Posted By tommytroubles 5/21/2007 4:03:59 PM
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tommytroubles
 Posted 5/21/2007 4:03:59 PM
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The vehicle is a Renault Espace 2.2 dci on a '02' plate, engine code G9T 722.

The vehicle came in running but it would cut out above 2500 rpm and the MIL lamp illuminated.

Fault codes retrieved using Autodiagnos were as follows:

313 - preheater plug circuit

1623 - Preheating relay circuit

B408 - thermoplunger relay no 1

A602 - preheater plugs circuit

9604 - preheater relay circuit

A980 - clutch switch info

9510 - boost pressure wastegate

1533 - Fuel pressure info

As a result of this we changed the fuel rail pressure sensor and the pressure regulator, this did not solve the problem, all of these DTC's were clear and the engine run again and the DTC retrieved again, however the only code remaining was B408 Thermoplunger relay no 1.

On closer inspection fuel had been blowing back pass the copper washer of the injectors and coked around the injector body. All four injectors have now been replaced and this problem rectified.

However the problem now seems to be worse as the vehicle will start but cut or idle for a few minutes and cut out with out on its own. Fuel pressure seems to be within the expected values but the tank pump does seem to be noisey. We have connected a pressure gauge and observed the live data using the scan tool but the pressure does not appear to decrease dramatically when the vehicle stalls.

The only remaining fault code at the moment is B408 thermoplundger relay no1.

So what I really need to know is does anybody know of any common faults that may cause this or could even suggest possible causes for these symptoms or fault codes. Any help at all at this point would be appreciated as we do not seem to be able to solve this one and autodata doesn’t have any wiring diagrams or anything that could help us.

I also have a Vauxhall Movano with the same engine with a non start condition that we need some help with, but I will post this as a separate problem. 

5/31/2007 7:36:36 PM by tommytroubles
Angus
 Posted 5/21/2007 5:38:05 PM
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tommy

That raft of pre-heating/thermoplunger [immersion heater] codes are almost normal on these.  The two that could have some relevance are that boost code and the fuel pressure one.

One thing that these do suffer - that doesn't leave a code - is the crank sensor.  Can you watch the engine speed as it cuts?

.

tommytroubles
 Posted 5/23/2007 12:36:19 PM
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Angus,

We have engine speed on live data, however we have found that one of the heater plugs is open circuit and two of the others have a high resistance. new heater plugs are coming in tomorrow, so i'll let you know if they make any difference.

tommytroubles
 Posted 5/28/2007 12:39:02 PM
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i've fitted the new heater plugs, still no better.....there is continuity between the the heater plugs and the relay and also from the relay to the ECU.
Angus
 Posted 5/28/2007 1:00:53 PM
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tommy

This was never going to be heater plugs; are you 100% sure of the low pressure pump? 

This does have a fuel-starvation sound to it.  Or - if fitted - maybe a cat issue?

.

tommytroubles
 Posted 5/30/2007 5:42:42 PM
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the pressure from the low presure pump seems to be fine, we have 15 p.s.i dead end pressure and 5 p.s.i with the engine running.
Angus
 Posted 5/30/2007 7:29:47 PM
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tommy

5 psi???   I'd have expected nearer 50?

My spec gives a G9T-722 as having a Bosch EKP3 pump with a running pressure of 2.5 to 4 bar.  [37-59psi.]

.

tommytroubles
 Posted 5/30/2007 7:38:22 PM
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sorry, we must have got the readings mixed up somewhere along the line. i will check these again tomorrow and we are also checking the pressure on the high pressure side of the pump at idle and will let you know what we find.
Angus
 Posted 5/30/2007 7:57:37 PM
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tommy

Your readings could well be right. 

It would all fit nicely - noisy tank pump - low primary pressure - symptoms of fuel starvation - fuel pressure code stored.

Go easy when testing that high-pressure side.  [You've got a Delphi HPCR gauge kit?] 

It's 300bar [4400psi] at idle; 1350bar [20,000psi] revved.  That's dangerous pressure.  A needle-thin jet would cut through your flesh like a red-hot cheesewire.

.

tommytroubles
 Posted 5/30/2007 8:13:18 PM
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i must admit im not im not up on high pressure fuel pumps. we've got the right kit to test the pressure and am aware of the dangers (thanks for the warning though Cool ) the manufactures spec are very useful though as we've got no data for this vehicle.

since i changed the fuel rail pressure sensor the the pressure faults have cleared this is why i havent spent more time suspecting the low pressure pump.


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