De-coking petrol engine cost

Mutton_Geoff

AdrianC said:

Now you're REALLY showing your age

I remember flashing the polarity of my MK1 Cortina from positive to negative earth (don't try this at home kids) so that I could install an 8 track player.

AdrianC

Mk1 Cortina...
It's only a couple more years until the first Sierras are eligible for historic MOT exemption and free VED...
The first Mondeos are going to be 30yo soon after that.

50Twuncle

tkharri said:

HELP!!!

I’m not really sure where to go and hope someone can help. 
I have a Peugeot 308 (65 plate) auto transmission. It’s had many, many parts replaced over the past 2-3 yrs. Eventually the whole engine was replaced (all under manufacturers or extended warranty). The problem is the new engine is now starting to fail. 
The original engine was de-coked as this was the first step in the process of fixing the engine issue. As the issues continued more and more parts were replaced, again I was told by the dealership they had to follow a process. 
Now the new engine has been in for a year, the same issues have cropped up again. So, the process starts again. De-coking was done this week and extended warranty have decided they won’t cover the cost (even though manufacturers warranty covered it previously).

My question is - why does a modern, new petrol engine need de-coking? I average 10k miles per year. It’s either sat on the drive (I work from home) or its up and down the motorway (albeit only 1 or 2 junctions South - 30-40 miles) and a short journey to Tesco once Or twice a week. 

Both the mechanic and I believe there’s something fundamentally wrong with the car but how can I prove it to the manufacturer and who is liable to pay for the de-coking that the dealership went ahead and completed because they were on the understanding extended warranty were paying. They’re now chasing me even though they didn’t give me an option to decline the work - just completed it. 

https://bgprod.co.uk/products/fuel-and-air-intake/bg244 costs around £30 but I wouldn't use it !

cajef

Mutton_Geoff said:

AdrianC said:

Now you're REALLY showing your age

I remember flashing the polarity of my MK1 Cortina from positive to negative earth (don't try this at home kids) so that I could install an 8 track player.

A mate of mine had a Motor spares shop, in the days before cars came with a radio he used to sell them, if the car polarity needed changing he would sell them new battery terminal connectors then send them to me to have the dynamo flashed and the connector changed, it made a nice bit of pocket money in those days.

molerat

Will a Redex decoke not work ?  My Rover 214 used to coke up before it had the new carbon breaker valves fitted and you could do a decoke by sucking Redex into the manifold - don't try it whilst parked in Acacia Avenue, go out into the middle of nowhere, anyone who has done it will know why.  An alternative to Redex is aircraft mineral hydraulic fluid.

AdrianC

molerat said:

Will a Redex decoke not work ?  My Rover 214 used to coke up before it had the new carbon breaker valves fitted and you could do a decoke by sucking Redex into the manifold - don't try it whilst parked in Acacia Avenue, go out into the middle of nowhere, anyone who has done it will know why.  An alternative to Redex is aircraft mineral hydraulic fluid.

No.

Pause and think about it... The redex goes into the fuel. The whole reason the intake tracts get claggy is that fuel isn't passing through them...

You'd need something aerosol that was taken in through the air intake. Even then, it'd do no use, because almost all of it would just pass by the deposits.

The only way to get at them is dismantling.

MinuteNoodles

AdrianC said:

Mk1 Cortina...
It's only a couple more years until the first Sierras are eligible for historic MOT exemption and free VED...
The first Mondeos are going to be 30yo soon after that.

Well that's my weekend ruined. I remember them when they first came out, the Sierra that is. God I feel old. 

molerat

AdrianC said:

molerat said:

Will a Redex decoke not work ?  My Rover 214 used to coke up before it had the new carbon breaker valves fitted and you could do a decoke by sucking Redex into the manifold - don't try it whilst parked in Acacia Avenue, go out into the middle of nowhere, anyone who has done it will know why.  An alternative to Redex is aircraft mineral hydraulic fluid.

No.

Pause and think about it... The redex goes into the fuel. The whole reason the intake tracts get claggy is that fuel isn't passing through them...

You'd need something aerosol that was taken in through the air intake. Even then, it'd do no use, because almost all of it would just pass by the deposits.

The only way to get at them is dismantling.

No it doesn't, you use the vacuum of the manifold to syphon it in neat, that was how it was done on the Rover and did clean a lot of clag off the valve stems.

AdrianC

molerat said:

AdrianC said:

molerat said:

Will a Redex decoke not work ?  My Rover 214 used to coke up before it had the new carbon breaker valves fitted and you could do a decoke by sucking Redex into the manifold - don't try it whilst parked in Acacia Avenue, go out into the middle of nowhere, anyone who has done it will know why.  An alternative to Redex is aircraft mineral hydraulic fluid.

No.

Pause and think about it... The redex goes into the fuel. The whole reason the intake tracts get claggy is that fuel isn't passing through them...

You'd need something aerosol that was taken in through the air intake. Even then, it'd do no use, because almost all of it would just pass by the deposits.

The only way to get at them is dismantling.

No it doesn't, you use the vacuum of the manifold to syphon it in neat, that was how it was done on the Rover and did clean a lot of clag off the valve stems.

I haven't used Redex for - literally - decades. But last time I did, there was a bit poured in each plug hole, and the rest tipped in the fuel tank.

Gawd alone knows how you'd "syphon" it into the inlet tract in any kind of atomised form. Or what proportion of it would touch the sides of the tract - but I suspect we'd be talking homeopathic.

Ganga

Could you not remove the air filter hose and pour or spray some Redex direct into the inlet manifold with the engine running ,make sure you do this in the middle of no where as it will give out a lot of smoke.
I remember my late father telling me about the time one of his work mates did this in the company car park ,the fire brigade turned up in about 10 minutes due to the smoke and the phone calls