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vim_fuego

vim_fuego

Hung Like a Baboon.
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The wife drives a 06 1.5Dci Renault Grand Scenic...A couple of few times over the past 10 days she mentioned it lost a little power whilst wishing to accelerate...only for a second or two then the power kicked in...Anyway its planned for a servicing real soon so it was ignored until that occurs...This morning she comes off her night shift stating that white smoke was coming out of the exhaust when she puts her hoof on the accellerator...No warning lights are on...no loss of performance...engine sounds the same and operates at normal temps...

Its Sunday so I can't take it to the garage so I thought I would idly try and work out what is wrong with it then mentally kiss goodbye to my slush fund to pay for it!

I think it might be the EGR stuck open...or closed...I can't remember which way gives you white smoke...

Anyone got any other theories? Anyone live iin Lincoln want to come round and fix it for me?!
 
EGR is purely for keeping emissions down when at idle. Plus if it was stuck in some way the ECU will (should) pick it up and put the fault light on.

Now white smoke is water being burnt off. If it's when the car is first started and still 'cold' then it's just condensation and will soon disappear.

What are the levels like coolant wise? How often are you topping it up if at all?

Re: Power Loss, as described it sounds like a flat spot in the power band, use to get this all the time back in my high performance Jap car tuning days and it was usually too much fuel being thrown in for one reason or another.

Lambda probe maybe? It is a consumable unit much in the same way as brake pads, shocks and tyres are.

Edit: Ah just read it's a diesel, do diesels have Lambda? :PDT_Xtremez_41:
 
White 'Smoke' could be steam, and mean a blown head gasket. Have a sniff in the coolant bottle to see if you smell anything untoward (cold obviously! ), or see any oily scum on top of the water.

Depends on how it smells and dissipates - if it dissapears quickly, then it'll be steam, and if it hangs around and stinks of diesel, then it'll be unburnt fuel. Maybe an injector on the way out...

Have a look through renaultforums
http://www.renaultforums.co.uk/showthread.php?t=86956

Gray
 
I ride an MZ, 'if it ain't smokin', it ain't workin'.

I realise that this is absolutely of no help at all, so would only suggest that white smoke being generated sounds like the glycol in your coolant, finding it's way to somewhere very hot.
 
Lack of power is often down to the Air Mass Sensor this is basically a heated loop of wire just after the air filter. The rate it cools determines fuelling requirements. Unfortunately the white smoke looks like coolant/water has found it's way into the pots. Head gaskets being the most common failure leading to this. Check for mayonnaise (emulsified oil/water) on the rad cap and, or dipstick.

Edit--Is it automatic?
 
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No mayo on the cap...exhaust fumes smell slightly oily IMO although Iam starting to hallucinate after a good 10 mins of sniffing...coolant OK. Its not an automatic. Aside from the white smoke its running fine except for those momentary lapses in power...

It was from the Renault forums where I got the idea of the EGR being at fault...
 
If the head gasket has gone you'd know it!
I've had 3 on past cars go. Noise, white steam bellowing out the back when throttling, loss of power......

I can't offer any other suggestion, dont do oil burners!
 
Vim,

I drive a 1.5dci Megane 05 plate last year I had a loss of power and it was the EGR valve, no smoke though. Replaced it myself as the renault garage wanted £195 to fit it. Cost me £102 from a local french specialist, took me 30 mins. Carn't help with the smoke though.
 
UlsterExile said:
Vim,

I drive a 1.5dci Megane 05 plate last year I had a loss of power and it was the EGR valve, no smoke though. Replaced it myself as the renault garage wanted £195 to fit it. Cost me £102 from a local french specialist, took me 30 mins. Carn't help with the smoke though.
Click to expand...

You must have small hands! Its right at the back of the block and fecking inaccessible!
 
Vim_Fuego said:
You must have small hands! Its right at the back of the block and fecking inaccessible!
Click to expand...

What about from underneath the car?

I've lost track of the amount of times where things become simpler this way albeit your probably still working by fingertip with your wrist bent over double.
 
So far one garage diagnosed over the phone that it was a blown turbo charger and would happily change it for £850...Yeah right!
 
Vim_Fuego said:
So far one garage diagnosed over the phone that it was a blown turbo charger and would happily change it for £850...Yeah right!
Click to expand...

Typically if the turbo has gone you'll have either no boost as in the exhaust wheel has fallen off / shat itself, alot of blue tinged smoke (More than usual for a diesel) as the oil seals may have gone or it goes and overboosts causing the engine to pink for a few seconds before eating itself. The last scenario though is usually prevented by ECU control and by your described symptoms it isn't that.
 
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