Hi thereI have a scenic 1.5 dci 2006 model, I have recently replace the diesel filter as it was blocked causing the injector fault warning message to appear on the dash. However, when accelerating at speeds above 50 mph in either 5th or 6th gear the engine runs intermittently, its almost like its misfiring. Lower speeds it seems ok. Could this be an EGR valve problem, or does the scenic diesel have a ported vacuum switch or vacuum control solenoid that is faulty. Or is it something else. The main renault dealer cannot find a fault.Hope you can offer some advice.Laurence MNorwich, UK
Country: United KingdomMake: RenaultModel: Scenic 1.5 DCIYear: 2006Engine: 106
tried the main dealer, but they could not find a problem!
Hello and Welcome to justanswer..What is the mileage on the vehicle - ?What is its service / recent repair history ( other than that above ) ?Do you still get the fault light on now ? and has the Ecu been reset ?Too - other than fault codes, what other tests / checks have been done ?Lastly - does the car blow excess smoke - and if so, what colour?Rgds, MIKE..............................
Hi there Mike,Current mileage is 57030. Regrettably the service history is unknown, I have had the vehicle only a few months. The previous owners clearly looked after the vehicle as its absolutely spotless. The garage I bought it from (used car sales centre)serviced the vehicle, well probably changed the oil! The main renault dealer in Norwich I decided to take my car to diagnosed the following and as a result changed the fuel filter. However, they could not find any other fault. Although I did take it back to ask about the "miss fire" they suggested that I was driving at a too lower speed in a high gear! This I can assure you was not the case.The dealer report read (before filter change); Diagnostic fault logged - rail pressure. Carried out checks ref fault finding, check primary fuel circuit, high vacuum on circuit between filter and H.P. pump. Feed to filter ok. Fuel filter blocked.I cant say I've noticed smoke when driving, although on starting the other morning I did notice a wisp of light coloured bluish smoke blow past. The oil level on the dip stick also remains constant.I am not aware of any more detailed diagnostic checks being carried out. I would imagine if there were any other fault codes logged in the ecu, these would have shown up along with the rail pressure fault code. Hope this helpsLaurence
Hello again Laurence - thank you for your reply / info...What you say is essentially correct re the diagnostics - but some things dont always log fault codes - so that can be somewhat misleading. Even a lot of garages rely to heavily on fault codes these days - concluding that if no codes are present, there is no fault....when you know for a fact there are faults by the way it drives / performs...The questions I ask were to get an accurate overview so that I can hep you properly.There are known / common issues with all vehilces / systems and on these, they are indeed mostly with the fueling systems - and especially the injectors.This is where I was heading / leading with question re what had been done , checked - especially as you had mentioned the clogged fuel filter. That having happened would tend to indicate maybe the servicing has not been so good..or, there are faults looming with the pump or injectors. If there were traces / particles found in the fuel filter, filings etc , that can be as a result of the pump starting to give trouble and the injectors are infected by this also.What happens is the injector pintles stick either by wear or faults / plain faults or particles that have got into them. The next best thing to do / have done on this is whats called a flow rate test. This is a kit connected to the injectors and tests the flow rate - and shows up any faults with any of the injectors. I recommend you have this done now in view of everything - its not an expensive thing to have done and will tell you a lot... I also recommend that you have a local Diesel Specialist do this for you - they have the knowledge to carry from here if you like - and of course, they have the equipment / kit that is needed to carry that -and other tests if necessary after that - So thats the way forward on this one for sure now Laurence - its difficult to say at this point just what will be wrong definitively as in this part or that - because you need to have the above tests carried out to determine that - so that is the best advice now as to the way forward to get this sorted out for you -and then most cost effective way forward also ... that will get this sorted for you ..
I'm very pleased to have helped you- .. By all means let me know if I can help anymore...Meantime >>> Please click the Accept smiley for me Now - Thank You ...Please note , you need to press the Accept smiley button even if you are a subscriber to justanswer - thank you .Kind Rgds - MIKE
34 years of vehicle repair / diagnostics