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Hi All,
this is my first message in the forum and I would like to ask you help for a problem I have with a Renault Clio MK2 1998 1.9 diesel. I would like to say first that I’m not a technician and I’m trying to DIY since the value of the car is very low and doesn’t have sense to spend a lot of money for it. This car has engine code F8Q630 with Lucas Epic diesel pump, I bought this car in October and the only issue I had (and still have) was a power drop around 1500-1800 rpm. The car basically can’t be stable at that range of rpms while for more or less rpm works fine. Now with the winter I started to have also misfiring with a lot of white smoke from the exaust. If the car is cold, it is not able to idle correctly and misfires up to the moment when I accelerate to more than 2000 rpm, in this case it will work correctly for a short time, and after start to misfire again. If the car reached a warm temperature, the car will work fine and only the power drop issue is present but with much less effect.
What I have tried up to now:
1) Changed all 4 diesel injectors.
2) Check that the sensors have a correct resistance at cold. (unfortunately I don’t have the tools to test them when running). Cleaned all the connection and checked connection between sensors and ECU.
3) Tried to get ODB-2 codes but unfortunately the car needs a proper Renault Clip tools 🙁
4) Checked and cleaned the EGR valve
5) Disconnected the CAT and crank the car to see if the CAT was clogged but the problem persisted.
6) Changed the fuel filter, also no air is seen through the tubes.
7) Changed the glow plugsComing soon:
I’ve ordered the crankshaft sensor and I will replace it as soon as it arrives.What do you think should I try next? I was thinking of changing the Air Temperature and Coolant sensor but I don’t know if they can cause the issue and since their values varies slowly I don’t think they affect the power drop problem at least.
Thanks in advance and if you need more info please ask.
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You replace part that might need to be replace. You have a head gasket failure. You can use a leak test if you don’t believe me. But you have all the symptoms. You can replace the gasket or use SteelSeal to repair It. If you whit smoke is like a huge cloud, you need to replace It. But I you have not a big one you can use SteelSeal a permanent epoxy fix. Cost less thand replace the gasket if you don’t have a garage or a roof above you head to do It.
[video]http://www.youtube.com/watch?v=WgrfT0LFMhc[/video]
[video]http://www.youtube.com/watch?v=cEJ51BJ23yk[/video]
If the check engine light is on.Try to get the codes
pulled.This is our first clue of whats wrong. Fuel
pressure on a diesel is critical.I would find some
of this cleaner and run it through.Hi,
I’ve tried Steal seel, let the car run for 2 hours and let is cold for the night. The day after I’m still having the same problem, so I had rerun the car for 1.5 hours at fast idle and let it cold down but doesn’t fix the issue. Strange enough the radiator fan never started but the hoses and the radiator were hot (but the weather is cold now).
I have noticed that in the oil decanter a white sludge is present and is almost full. The sludge is not present in the expansion tank cap.
diesels have the tendency to blow compression through the water system when they fail due to the large amount of compression and it would not run for 1 and a half hours without killing something i would say you got a fueling problem have you leak tested all the injectors if not do that first thing as this will give you all the info you will need as to weather you are dealing with a mechanical fault or an electrical problem let me know the results and go from their i suspect the timing advance in the pump is at fault but do the leak down test first ?
Yes the car didn’t turn off when I was doing trying the steal seal. I had changed all the 4 injectors so there should be no leak. Also I noticed that when the car goes in sort of fast idle (i hear a buzzing noise that last for all the time of the fast idle) the issue disappears and the car work properly.
no your not looking for leaks you disconnect each injector dribble off pipes and connect tubes all the same length and lead them into measurable cups then run the car for a measured amount of time and the results should be equal amounts of diesel in each cup ? this checks the mechanical side of things like the diesel pump and injectors its always the first thing any garage or mechanic does when diagnosing diesels after ecu read of course
Really stupid question but If I redirect the fuel from the injectors to this cup, how the car can run? If I have only one injector detached the car will not start at all for me. Am I missing something?
hi sorry i should explain things a bit better im new to forum talk it don’t matter if mechanical or electrical what you have to do is take off the spill of pipe which is the small return pipe on the side of the injector and put your own pipe on it to fill a small cup because when the car runs the injectors have to spill of un injected diesel so it returns back into the system so if you have an injector that don’t work properly it will either not spill of anything or it will spill of too much its a really good way of diagnosing mechanical failure also you need to do this to all 4 injectors at the same time when you have connected each individual injector to its own pot or cup as long as they are all the same size for measuring reasons next start your car and run it for a minuet or 2 until you got enough diesel in each cup so its measurable then measure each amount against the others and look for a difference in quantity then report your findings back to me be sure that each cup is allocated to a cylinder so you don’t mix them up ie cup number 1 = cylinder number 1 and so on ? also record the time it ran for and the exact amount of diesel it spilled of for that amount of time ? its the best way to diagnose the diesel works you should find the problem a lot easier this way all the best report back
one other thing i should mention is the fuel shut off solenoid ? have you tested that it works ok ? has the car ever overrun when you turn the engine off ? or delayed starting ?
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