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7K views 72 replies 8 participants last post by  garethwood 
#1 ·
hello. im hoping you guys with the knowledge can help me?
i bought a megane mk1 phase2 cc 1.6 16v just over a month ago and the first time ive taken it on a journey longer than I0mins it goes into limp mode and stalls, now its a complete non starter....
what i can tell you is..
1 it had half a tank of fuel.
2 i got no warning lights at all
3 the pump sounds like its priming when ignition is turned on ( only 2 secs tho)
4 there seems to be no fuel coming into the head
5 ive cleaned the tdc sensor
6 there is an alarm issue as in i cant lock it without the side lights flashing constantly so i dont bother.
before i spend 200 quid on a fuel pump.. any other ideas or experiences that you can point me towards? pls help : )

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#2 ·
IMO its unlikely to be the fuel pump sending it into limp mode. Maybe you should replace the TDC sensor, cleaning it won't bring a faulty one back to life if that is the problem. As there is a fault I'd say the ECU is signalling the pump or injectors not to pump.
 
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#3 ·
i cleaned the tdc sensor based on the fact that its had trouble starting and ticking over on the odd occasion and the tdc sensor was pointed out as a common fault. is it likely that this sensor would stop the fuel pump from bringing in fuel to the engine if it is shoot? and would this cause a limp mode effect whilst running? im clutching at straws here as now it wont start and i need it for work next week!

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#4 ·
... and the tdc sensor was pointed out as a common fault. ........ and would this cause a limp mode effect whilst running?
Yes if its fooked. They're not expensive so its worth replacing. Seeing you need it sorted asap you better get yourself to a parts shop sooner the better.
 
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#6 ·
ok so recap on the car....
ive replaced the tdc sensor, not a cheap 1 either.
ive checked weve got sparks from the plug.
ive had the fuel filter off and furl is coming thro, the fuel is also reaching the rail when the key is turned.
So.. we have fuel we have spark we have air, the fire triangle is complete.
But it is still no closer to starting! : (
oh and i even hooked up a new battery to make sure we werent low on power, and i removed the maf and gave that a good clean out just incase.
im all out of ideas?

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#30 ·
ok so recap on the car....

oh and i even hooked up a new battery to make sure we werent low on power,
Do you mean brand new battery or a good replacement battery? Is this fitted to the car or was it connected via jump leads? If the old battery was disconnected has the alarm reset been done properly?
 
#11 ·
Sounds like the injectors are not firing as you've got all the other bits working. Have you tried resetting the immobiliser or what problems has the immobiliser been giving you? Assume its the factory fitment?
 
#12 ·
seems i have two threads running about this car and they maybe heading down the same path... if the imobilizer has had a fit due to the alarm not working properly, would this cut out the injectors stopping it from starting? and if this is the case which im hoping it is as ive hit a wall! would this stop the car whilst moving?

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#13 ·
when i put the key in and turn the ignition on the light on the dash comes on with the rest of the standard check lights then turns off. after some research it seems this is the normal working procedure.
and ive been assured there is no way an imobolliser can stop a car running so not the cause of the breakdown!
that said if i could get my alarm working properly then at least it would be something to rule out.
starting to regret purchasing a renault, its only the second ive had and the previous clio was a problem child : (

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#15 ·
..........and ive been assured there is no way an imobolliser can stop a car running so not the cause of the breakdown!
that said if i could get my alarm working
An immobiliser disables the ignition circuit/electrics and may sound the alarm ....... an alarm is the poorer version that simply sounds the audible hooter/siren device or flashes the lights when it detects door opening etc.

So a faulty immobiliser can stop the engine at any time.
 
#14 ·
the first time ive taken it on a journey longer than I0mins it goes into limp mode and stalls, now its a complete non starter....
what i can tell you is..
1 it had half a tank of fuel.
2 i got no warning lights at all
3 the pump sounds like its priming when ignition is turned on ( only 2 secs tho)
4 there seems to be no fuel coming into the head
5 ive cleaned the tdc sensor
6 there is an alarm issue as in i cant lock it without the side lights flashing constantly so i dont bother.
before i spend 200 quid on a fuel pump.. any other ideas or experiences that you can point me towards? pls help : )
I have read about Meganes having electric issues with the fuse box at the back of the battery. perhaps its not a fuel issue?
 
#16 ·
ive had a good check over the fuses inside and out, no obvious faults. ive been around unplugging and cleaning various connecters no such luck on that. at this point ive admitted defeat and made an appointment for a mobile mechanic to have a look tomorrow.
hopefully he will find a fault and i can report back on that.
thanks for all your help : )

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#17 ·
Have you checked the relays.
Underbonnet fusebox..
Middle row large relays. Bottom row smaller relays, (these are the ones I am referring to)
The one closest to the fuses, this is the fuel pump..
One next to it is the Engine Ecu.
See if you can change these with the two other relays
Just take a photo,, but all should be the same relays.
Or if you want, pull these two relays out, switch the ignition on, then replace the relays, you should hear the relays click..
See if it is just a dodgy relay...
 
#18 ·
Check your earths, electrical gremlins come in many guises, and they're not always apparent.

It's a known fault on Siemens injections systems on the Peugeot 307 for example, where if the battery runs flat, is disconnected incorrectly or if the straps are loose, the BSI can become corrupted. Often the BSI loses the key code info, rendering the car immobile.

If you've got a ****y relay or other electrical gremlin, the immobiliser can/will prevent the injectors from firing, as previously suggested. All other systems may be working OK (lift pump, HP pump etc).

It's worth making sure the basics are covered before splashing out on new pumps, injectors etc.
 
#20 ·
the saga continues..... yet to get the car started but a discovery has been made. everytime you try and turn the car over the ecu loses power to the main sensors or so the wizard with the laptop says? the first time he thought it mite be the fuse/relay box. but now believes its likely to be the barrel thats shot!

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#23 ·
he thinks the ignition might be shorting? i dont yet own a multimeter but thats on the list of things 2 do tomorrow. his advice was to connect the starter motor to the battety whilst the ignition is in the on position and if it will start then the fault is with the ignition? at this point I'm up for trying anything!

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#26 ·
Also with reference to your other thread did the previous owner say words to the effect that "the car's never gone into limp mode before or the alarms never played up before"?
 
#28 · (Edited)
Hmmm! Was just trying to think if its a fault(s) that's only just happened since you've bought the car or if there is an intermittent problem from before that comes and goes at will.

Seeing as its a recent purchase had the underbonnet/engine been steam cleaned/pressure washed by the seller?
 
#31 ·
yeah ive got a spare battery and leads off my dad its not new but got charge, and ive just been piggybacking it with jump leads. ive not disconnected the meganes battery just knew it was getting tired of not starting so needed help : ) ive not touched the car today as ive had 4 days off to spend with the family so no tinkering today. ill have another play after work tommorrow. my plan is to remove the fuse box next to the battery and clean all the terminals. clean up the fuses on the battery and maybe remove the barrel and check for damage to that? if it still wont start ive got the mechanic coming over thursday to have another go at it!

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