Renault megane 2 1.6 16v DF119 and lack of idel

[wodorof]

Hi,
i have problem with 2003 petrol megane,
cold engine does not idle, starts and stops immediately,
when i put foot on acc pedal engine works at higher revs, some times when engine is warm and when i lower rpms slowly, engine idles, but it is still quite unstable
every sensor looks fine on diagnostics, i only have df199 cam shaft sensor error
i changed sensor but error stays and there is no improvement.

Thanks in advance!



[SOLVED]!
timing was wrong, due to pushstart belt jumped two teeth,
and it caused whole problem

[Louislesinge]

Hi,
Did you check first the valve timing?
Did you clean throttle?
Greetings,

[wodorof]

throttle is clean, and it was replaced for test, with no effect,
i`m planning to check timing in the morning, but i`m not sure how to lock crank shaft in position without special tool..(is it at TDC?)

[Louislesinge]

Yes, it's at TDC, removing the covers in the rear of the camshafts the slots should be both horizontal.

[wodorof]

everything looks fine,
i will check wiring form ecu to sensor....
and i don`t have any more ideas, what can cause lack of idling ;/

[wodorof]

i checked wiring, and after cleaning and correcting pins in camshaft sensor plug error disappears,
so there is no errors, but i noticed that engine runs on way too rich mixture, spark plugs are black,(they are new, spark appears even at every cylinder)

please help i have no clue what check next.

[Louislesinge]

Ok,
If engine is too rich, check water temperature sensor (does it goes from cold to 95° ?) , check admission pressure sensor (warm engine running idle about 400mbars) and finaly first lambda sensor (tension up and down from 0,1 to 0,9V normally) but report us the value.
Sometimes if you press "thanks" it will encourage members to help you...

[wodorof]

all readings looks fine
temp sensor(wile measuring it showed form 7 to 91deg)
pressure sensor(400-410 at ~1krpm)
first lambda voltage jumps form ~120mV to 890mV,(second lambda works too but i don`t remember exact values )
i also checked fuel pressure(looks fine)
is it possible that injectors are worn out?
when i removed them form manifold, they didn`t create a mist but something like thick drops, and injector 4 gives smaller quantity of fuel.

[Louislesinge]

Re,
About no pressure when you disconnect the injectors, if it has been done a few minutes after turning ignition off, it's not normal (fuel pump should keep the system under pressure for half an hour, fuel valve is defective ).
If one injector sprays less, ECU tries to correct it as it generates a general poor carburetion, not only for its cylinder (this not direct injection system, the mixture is done in the intake pipe, so one injector can influence general mixture).
The normal fuel pressure should be 3,5 bars. If lambda generates from 120 to 890 mV even under too rich state, it means lambda can be defective and drives the ECU to reach false good carburetion. Did you try to delete adaptative values? If it doesn't work, delete them again, disconnect lambda, wait a minute and run engine again.
Greetings,

[wodorof]

after resetting adaptive values, i took the car for ride,
now when engine is warm, car is drivable, map sensor shows values around 394-415bar at idle,lambda lowered values, and engine runs smooth, but when i gently apply throttle between 1,2k rpm and 1,8k rpm revs are floating from 800 to desired value, also map values jumps from 340 to 550,and ignition angle jumps also from -2 to 24 deg, on higher rpm car runs fine,
at cold engine car still don`t idle,

[smokey08]

Change the dephaser pulley on the camshaft

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[Louislesinge]

Hi,
When you say no idle, you mean engine stops or it runs to high?
If engine stops, it can be because oil is not the right grade (should be 5W40 or 10W40), and makes hydraulic pushers let the valves open
If idle is very high, change the seal between throtle and the intake manifold
Did you take petrol pressure?
Greetings,

[zeca]

it is usually from the throttle body
Have you seen in the dialogys the def199?
You can tell me the oval plate or vin, only 4 digits after vf1 ....

[zeca]

hi
Def is 199 or 119 ?

[zeca]

DEF 119 and 1def,2def,3def,4def,5def or 6def ?