Mechanics

WILL NOT START SOMETIMES

2001 Renault Megane

Electrical problem
2001 Renault Megane 4 cyl Two Wheel Drive Manual 99000 miles

HI,
My Megane 2001, 1.4 petrol has had strange tome since I bough it. First I had to take the immobiliser out as it went faulty (as mechanic said) and won't let it start. Then it ran a few hundred miles good biut strated power loss. I had to change coil pack and it went back fine. Now it has very strange problems.
1. Sometimes it won't start. Battery is ok, engine turns and revs but won; t start. So I have to push start it. Once I push start it, it just goes back normal, drives, and starts normally. This will happen again, nest day or next week, but it does happen.
2. Second problem is power loss and strange sounds from the back of car (may be exhaust) after it goes on long journeys or even does a few miles. This will make the car less accelerating going up the hills.

mechanic told that this is def a current (or crank if I misheard) problem. I just want to ask you guys if he is right? Also the power loss, do I need to change other coils pack (Prev I changed #3).

Pls help.
many thanks
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Meganekadriver
March 2, 2009.



You should really change all the coils at the same time. This could be your loss of power problem and noise from exhaust. I don't understand your starting issue? Does the car crank over and not fire up. Or is it just making a clicking noise or doing nothing till you push start it? Let me know

Dave H
Mar 3, 2009.
Yes, have tried changing the coil and it was not mis-firing at least today.
The engine revs, as if it wants to start but something is just about stopping it. After a little push, its gets started and then it will not need any pushes for unknown period when it decides to do it again. If its a crank sensor, it should really happen every time and not once in a week or few days.
What do u say?

Tiny
Meganekadriver
Mar 4, 2009.
You said in your first post " changed coil #3" . You should really change all 4 at the same time. They alway's breakdown in sequence. So the best thing is to change all together? I was an RAC/Greenflag tech in england for ten years. Nothing surprises me with a crank sensor.I have known them to play up for days then be perfect for another month. For what they cost it is worth changeing it. I would replace all 3 other COP (coil on plug) as well. Let me know

Dave H
Mar 4, 2009.
Thanks Dave,
I changed #3, made it to 70%, then yesterday changed #4, now making 100 firing, so I think they are ok at moment. Of course I am looking for a bargain to find four new and then will change them all if and when required, at least they will be in stock. Well not worried about it anymore as I can do it myself. I can play with TDC as well but would love if you or someone can tell how to test if this is really the fault and if it is, I had a look at it and I am sure its a straight fwd job (for a DIYE like me).

So do u have any ideas how to check it?

TA
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Tiny
Meganekadriver
Mar 4, 2009.
It is a straight forward job. Just a matter of testing the resistance and voltages of the wires. Unfortunately for you the renault series of vehicles was not released in the USA. So I do not have the spec's to hand. Do you have a manual for the vehicle?. I will email a buddy in england to see if I can get the spec's for you. Now you have the coils changed is it running correctly again?

Dave H
Mar 5, 2009.
Well, so far I only tried coil#4 changing. I just put the coil back which the mechanic almost threw considering it is dead but luckily it is working 80% and making the car on full with no mis-fire and its so good running, never mis-fired since last two days.
However starting problem is still the same, can you tell me what is it that it won't start sometime and will rest of the time. Really don't know if it is TDC sensor or something to upset the ignition system. I have a digital multimeter but I don't know the settings to test the sensor. Also I don't know if to check the TDC wire from which points.
But one thing is def, I will not go to that mechanic who put the wrong (faulty coil) which caused it mis-fire.

Anyway, thanks a lot for your time.

Tiny
Meganekadriver
Mar 5, 2009.
My buddy has not got beck to me yet with the voltage readings for the sensor .. sent another email this morning !! check the wiring from the CKP ..for corrosion, splits etc. .. trace it back as far as you can to check it !!


http://www.2carpros.com/forum/automotive_pictures/266999_AAA2_47.png


Dave H
Mar 7, 2009.
Morning, well I managed to unbolt it yesterday, it had strange whilte little mettalic things sticked which I wiped & cleaned with a scratch pad and put it back. So this week, it will tell if it was just this that it wanted or it needs a new part. What I need to know from you if TDC is working and let it start, can it be faulty?

Tiny
Meganekadriver
Mar 8, 2009.

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