Question about Renault 181

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R reg Megane Scenic non start

Hi,
Got a Megane Scenic 1.6 mpi manual, engine cranks but won't fire. No noid signal at injectors, no sparks, got ok resistance at rpm sensor & continuity to ecu from sensor and from injectors. Immobiliser light goes out. MODIS code reader shows no fault codes but says i've only got 8 volts and no fuel pump running. Car hasn't ran for some time & has had front end repairs. Found fuses missing from box at n/s/f wing and there is only one (brown) relay in there but space and terminals for another. Earths on o/s of engine seem ok & tight. Any suggestions??

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  • Anonymous Sep 11, 2008

    Renault Scenic 2001 randomly won't start, engine turns over does not fire, rest for several minits it fires. Occasionally cuts out on tick over or slow running, but does restart straight away, no difference noticed on panel lights etc help

  • Anonymous Mar 14, 2014

    I have a 2003 1.6 Scenic Megane that has recently been losing power while I'm driving. Have to pull over and turn motor off then start sometimes have to so this many times. The electrical fault light was coming on but when I took it to mechanic he put diagnostic tool on but no fault code showed up. This happened on and off for months now there is no electrical fault light coming on but there is sometimes no power when driving and it has just started to not turn over every time I start the car it takes several tries before the engine starts up. Can anyone help?

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Sounds like your taking too long to put the key in the Ignition and turning.If this happens, just press the button on ignition key to lock the door then press again to unlock then put key into ignition and turn to start! If this doesn't work then it might be something more serious than that!

Posted on Jun 22, 2012

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Hi

Well, no noid signal and no spark says to me that the crank sensor is at fault.

Does the check engine light come on when you turn on the igntion? If not then the ECU is not waking up.

Regards

Geordie

Posted on Jun 11, 2008

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2011 swift 1.5 no injector pulse no spark


blown fuse. ; is first, as per always.
2nd is scan it, did you scan it yet? that is always 2nd.
all efi engines, all ECU , all cut injectors for (noid lamp test dead?)
you said pulse,does that mean fuel pulse or electronic pulse to injector coil..... ? all injectors dead. or just 1. same for spark.
toss coin land, noid dead. all noids
loss of. NOID signals.!
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1987 cheverolet camaro will not start. Replaced a but load of parts...good spark , computer is new and working , fuel pump is new and working , distributor new and working , throttle position sensor new...


I think I would be looking at the crank angle sensor and/or the cam sensors on this vehicle.It seems to me the engine isn't getting the signal to fire up.What happens when you squirt some fuel into the combustion chamber ? If it fires up I would be looking at cleaning the injectors.If it doesn't fire up What's the pressure on the fuel rail. does it have a buy pass pressure valve on the rail.Some suggestions good luck

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1 Answer

Gas injector spray gas all time cylinder 2 and 5 when you open ignition


92 kick. (there is no cylinder 5, sorry) it's a 4 banger. all are. that year.
must be the G16b engine. 16valve MPI engine, 1.6Liters.
open ignition?
on this car, the injectors fire about 3 to 5 milliseconds at idle.
3/1000'th of a second, only.
if they stick on, that is caused by the following
why not connect a NOID lamp to each feed wire to injector
and see what it is doing.??????
http://www.fixkick.com/INJECTORS/injectors.html#NOID
1: injector leaks.
2: fuel pressure way over 60psi and inject can hold it back.
3: ECU is stuck , bad injectors driver in ECU shorted.
in case 3 the noid lamp glows key on., steady.
4: the FSM stated injector balance test will fail.
5: the FSM stated injector leak down test fill fail.

these tests are the same for all MPI based engines.

http://www.fixkick.com/INJECTORS/injectors.html

connect noid,
key on,
the noid that glows, shows what ECU line is stuck low.
stuck low can be , bad wire or bad ECU, only.

if the noid test passes.
that is.
not stuck on
and as you crank the lamp flashes same on all 4 MPI harness connectors (injector feeds) then the electric side is good.
and the fuel side is bad.
if key on fuel pressure is near 30psi (see pump page same site)
then the injector is bad,
see link for pro $20 cleaning company.


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1 Answer

Car won't start


Hi there:
You will have to pinpoint what the engine is missing...
- Spark
- Fuel
- Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Hi there:
You will have to pinpoint what the engine is missing... spark, fuel, compression.

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Hi there:
You will have to pinpoint what the engine is missing...
- Spark
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All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Hi there:
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Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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You will have to pinpoint what the engine is missing...
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Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

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1 Answer

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You will have to pinpoint what the engine is missing...
- Spark
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All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

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2 Answers

I have fire and fule I just replaced the spark plugs and redid the timeing and it still wont start what ellse can I do?


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