03 C5 2ltr hdi be sluggish going uphill...could this be the

[Citroenmad]

I got mine from Wida Components. Google them and give them a ring, they are usually well priced.

[stu9]

Would it ok to fit a 2nd hand one or is that a no no

[myglaren]

Just had mine replaced along with timing belt/water pump and whatnot.
No dramatic improvement - that came with the MAF clean, pipe cleanout and throttle cable adjustment. Goes pretty well now.

[oneday]

all these repairs and cleaning help to get the power back also use of a good fuel system cleaner now and again

[stu9]

I'll get brake cleaner tomorrow and try it

What about a 2nd hand ic....should I....or a new one

[oneday]

thats your choice if you feel happy with a second hand one go for it it will also help to keep the costs down

[myglaren]

I was offered a second hand one for £40 but decided against it, might have been OK but could just as easily pack up after a couple of weeks.

I took a bit of notice of mine today.
Will do 30 quite happily in 4th, even on an upgrade and will do 20 on the flat without complaining.

[stu9]

Will do 30 quite happily in 4th, even on an upgrade

Mine will too.....but only on a flat rd....throw in even a slight hil (and I mean slight) and it's into 3rd....or take your foot of the pedal slightly....but nearly allways into 3rd.....I'm not trying to boot it or anything, just driving normal ie 30-40 in 4th

[stu9]

How do I know how much brake cleaner to use.....how much is too much and vice versa

[Citroenmad]

You cant really use too much, as its just a solvent. I blew mine out with an air compressor after, just to be sure.

[Gibbo2286]

disconnecting the maf only proves it is still working to a degree. inside the maf barrel is 2 very fine wires these need to be clean to give the correct readings you can clean them with contact cleaner or brake cleaner or simular but dont touch the wires they snap very easily.

intercooler can be checked under the bonnet small rad on righthand side of main radiator with large hose at top and bottom if you look at the bottom of the fins they should be dry if wet with oil it is leaking and you will lose power and use more fuel also check intercooler hoses for leaks.

The intercooler is an air to air heat exchanger it has no oil in it, any oil you find in the intake system is simply spillings from the breather on the rocker cover finding their way to the bottom. A leaking intercooler problem will be a split seam or joint allowing the pressure out, spray around the outside on tickover with a Fairy Liquid solution and it should show any leaks by blowing bubbles. Serious amounts of oil in there will cause the exhaust to chuck out blue smoke, if that's the case it's likely to be the shaft seals in the turbo gone pop and a turbo overhaul needed.

Cleaning, attempting to clean, the MAF sensor is not a good idea, the working parts are delicate like the filaments in a bulb and are easily broken.

[stu9]

Now i dont know what to do


Christ a few said the turbo should be fine, you say it won't

They say get brake/contact cleaner and spray the maf, you say dont

Who's right ?

[Gibbo2286]

Now i dont know what to do


Christ a few said the turbo should be fine, you say it won't

They say get brake/contact cleaner and spray the maf, you say dont

Who's right ?

I didn't say that Stu, your turbo may be fine and probably is if your exhaust isn't chucking out a lot of smoke, however I stick by my 'don't mess with the MAF' comment they really are easy to stuff up.

[Gibbo2286]

Stu, if you look at my picture further up the thread the big rubber hose to the left, disconnect that at either end and with the engine on tickover 780 RPM or thereabouts you should have a healthy blast of air coming from the turbo through the intercooler, if you don't then the turbo's not working and you'll need to find out why, possibly as in my case just a split hose on the vacuum side or a faulty elecrovalve or turbo actuator (rarely).

On tickover if you track the vac hose from my arrow up you'll get to the electrovalve, pull that end of the hose off and check that there is near full vacuum 0.8 bar, a gauge is needed to do it properly but you can get a good idea by seeing if it sucks on your finger, if it doesn't then the hose has a split between there and where it's connected at the servo end (my arrow). if you have full vacuum there put the hose back on and you will now need a vacuum gauge between the electrovalve and hose that goes from the electrovalve down to the turbo actuator, this again is done on tickover but the vacuum is controlled by the electrovalve and is only 0.6 bar at 780 RPM and 0.25 bar at 4000 RPM

[stu9]

Thanks Gibbo, dont have a gauge though and not sure how to use it if i did

I'll pull the big hose off though and try it

No wonder the seller sold the fkn thing, he knew what needed done, bastard!!