Hi i have 1.5dci grand scenic and have been told it needs 3 new fuel injectors due to contaminated fuel .Can used injectors be re-encoded for my vehicle if not why sell them as spare parts ? any help would be much appreciated
stephenwightman
Re: disel fuel injectors
My understanding of this is that the injectors are given a code to represent the flow rate of the injector (which pressumably varies as a result of manufacturing tolerances).
So it is the ECU that needs recoding when changing the Injectors to let it know what it's working with. This can be done by a dealer on their machine, or quite possibly by a good independent garage.
I'd be mildly suspicious of anyone who told me I needed 3 new injectors without fairly substantial evidence. Like a knackered fuel filter for instance.
My understanding of this is that the injectors are given a code to represent the flow rate of the injector (which pressumably varies as a result of manufacturing tolerances).
So it is the ECU that needs recoding when changing the Injectors to let it know what it's working with. This can be done by a dealer on their machine, or quite possibly by a good independent garage.
I'd be mildly suspicious of anyone who told me I needed 3 new injectors without fairly substantial evidence. Like a knackered fuel filter for instance.
Re: disel fuel injectors
Your right,the ECU needs coding to the injectors rather than the injectors to the ECU.
It is for two main reasons,no two injectors are the same and deliver a fractionally different amount of fuel each,and also the pressure in the rail isn't constant so the ECU needs to know where each injector is.
Some systems are more sensitive to this than others,I've changed single injectors on Peugoet/Citroen HDi's without any programming before and they have been fine,if you try and do the same on TDCi Fords they run like an absolute bag of sh1te!.I'm not sure about Renault systems,but I guess it is safer to assume they need programming to the ECU....
Exacty what tests were done to tell them that the car needs 3 new injectors,and what were the symptoms?.
Your right,the ECU needs coding to the injectors rather than the injectors to the ECU.
It is for two main reasons,no two injectors are the same and deliver a fractionally different amount of fuel each,and also the pressure in the rail isn't constant so the ECU needs to know where each injector is.
Some systems are more sensitive to this than others,I've changed single injectors on Peugoet/Citroen HDi's without any programming before and they have been fine,if you try and do the same on TDCi Fords they run like an absolute bag of sh1te!.I'm not sure about Renault systems,but I guess it is safer to assume they need programming to the ECU....
Exacty what tests were done to tell them that the car needs 3 new injectors,and what were the symptoms?.
Thanks for the replies,
The company said that the fuel had been contaminated and the garage were stripping the fuel pump down.they told me it would be £170 per injection unit before en coding and fitting all together £1300 .
My other question is would 1.5dci scenic megane engine 05 be the same as my 05 grandscenic 1.5 dci.And would those parts fit.
The company said that the fuel had been contaminated and the garage were stripping the fuel pump down.they told me it would be £170 per injection unit before en coding and fitting all together £1300 .
My other question is would 1.5dci scenic megane engine 05 be the same as my 05 grandscenic 1.5 dci.And would those parts fit.
If I was being charged £1300 for new injectors /FP then I'd want enough evidence to sue the hell out of whoever supplied the contaminated fuel!
I'd say there's a 95% likelihood that the injectors would be the same, but to be absolutely sure you'd have to check the Renault part numbers are the same.
I'd say there's a 95% likelihood that the injectors would be the same, but to be absolutely sure you'd have to check the Renault part numbers are the same.
Hello 010101
My guess is that the problem is not contaminated fuel but the injection pump on the engine has broken up. This would appear to be a common problem with the Dephi pump in 1.5dci engines.
I had this issue and the company who reconditioned the injectors would not guarantee the injectors unless the pump was also done. Indeed I would suggest that the common rail is also replaced.
What appears to happen is that the pump breaks up and tiny pieces of the pump get into the and damage the injectors. Because the fuel return from the common rail does not go back to the fuel tank but circulates back it avoids the filter in the tank. i would get the fule filter changed and check the old one to see if there is any metal in the filter. I am told that the metal can end up like a pasete. I would be suspicious of being told it is contaminated fuel.
Sorry to give you this news but I am in a similar position of being told it was contaminated fuel.
Murcag51
My guess is that the problem is not contaminated fuel but the injection pump on the engine has broken up. This would appear to be a common problem with the Dephi pump in 1.5dci engines.
I had this issue and the company who reconditioned the injectors would not guarantee the injectors unless the pump was also done. Indeed I would suggest that the common rail is also replaced.
What appears to happen is that the pump breaks up and tiny pieces of the pump get into the and damage the injectors. Because the fuel return from the common rail does not go back to the fuel tank but circulates back it avoids the filter in the tank. i would get the fule filter changed and check the old one to see if there is any metal in the filter. I am told that the metal can end up like a pasete. I would be suspicious of being told it is contaminated fuel.
Sorry to give you this news but I am in a similar position of being told it was contaminated fuel.
Murcag51
quick update the fuel filter looks to be the cause of the problem the cars fully up to date on its services but the fuel filter has never been changed still original part from new.my garage informs me this is common practice as it is a nightmare to get to these filters so everyone check whats serviced.Ive managed to buy 4 reconditioned injectors for 295 + vat so this looks like the only way forward 600 pound cheaper than the original 1300 pound quote.many thanks to all who replied and unfortunately this is the last renault i will be getting .maybe this was a one off but since i got this i've had.
New dash board.
Two new rear passenger window motors.
New clutch.
Two new keys.
all i can say is this has been the worst car i've ever had.
Owened renaults for 10 years.
New dash board.
Two new rear passenger window motors.
New clutch.
Two new keys.
all i can say is this has been the worst car i've ever had.
Owened renaults for 10 years.
Further update to injector problem.
Still without vehicle recon injectors were great coded in fine to ecu so don't let renault garages tell you different.
but still firing on three and throwing out black smoke they are checking compression as we speak,and ideas to what else the problem could be.
Still without vehicle recon injectors were great coded in fine to ecu so don't let renault garages tell you different.
but still firing on three and throwing out black smoke they are checking compression as we speak,and ideas to what else the problem could be.
"The injectors all work well"
On a bench test or actually on the vehicle? Cos if the ECU output is damaged and not driving the fourth injector correctly it would misfire, and could in theory bore wash all the oil out of the piston rings and cause a loss of compression.
What was the result of the comp test you mentioned?
What did they do to achieve the black smoke disappearing?
On a bench test or actually on the vehicle? Cos if the ECU output is damaged and not driving the fourth injector correctly it would misfire, and could in theory bore wash all the oil out of the piston rings and cause a loss of compression.
What was the result of the comp test you mentioned?
What did they do to achieve the black smoke disappearing?
will find out more info on comp test i know they drained a third of the oil which was very thin and smoke dissipated check injector light still comes on and still firing on 3 but injectors were firing in sequence when tested.Will run what you have said by mechanic many thanks for help any more ideas much appreciated.
thanks to all
thanks to all
another update on the tragic scenic.
We have found one of the pistons is shot also the valve casing is knackerd another 700-800 pound to be fixed.
also previous garage who serviced car said they replace fuel filter this looks to be the cause of the problems we are getting fuel filter checked by independent expert then we are going to sue garage had enough of trusting supposedly reputable garages and them only doing half a job
We have found one of the pistons is shot also the valve casing is knackerd another 700-800 pound to be fixed.
also previous garage who serviced car said they replace fuel filter this looks to be the cause of the problems we are getting fuel filter checked by independent expert then we are going to sue garage had enough of trusting supposedly reputable garages and them only doing half a job
you have to recode these injectors they can even be done with a snap on scanner, if you cant get to any real engine management system i prefer to use real systems such as Ford ids, Opel etc, what happens is you plug your laptop or scanner to the port, select the right options and run a scan which gives you the codes already installed on the ECU, on the injectors on your vehicle (delphi) the codes are attached with stickers (bad idea) so if purchasing used injectors make sure they have the stickers on still. Then all it is is a matter of re typing the new codes in press the done button and the sytem loads the new codes to the ecu.
Regarding fuel contamination you will not only have to change the injectors but you will also have to drop and swill tank, all fuel lines blown out, fuel filter housing cleaned, pumps off and cleaned on test bench, if you just put recon injectors in this will happen again and void your warranty on recon injectors try http://www.injectorshop.co.uk try them they have 12 months warrant but as i said this does not cover fuel contamination.
If it was me it would be second hand injectors and sold.
Regarding fuel contamination you will not only have to change the injectors but you will also have to drop and swill tank, all fuel lines blown out, fuel filter housing cleaned, pumps off and cleaned on test bench, if you just put recon injectors in this will happen again and void your warranty on recon injectors try http://www.injectorshop.co.uk try them they have 12 months warrant but as i said this does not cover fuel contamination.
If it was me it would be second hand injectors and sold
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