My 406 Break - bought it for work, but already love the car

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joydivision
1.8 8v
Posts: 45
Joined: Fri Jul 02, 2021 7:18 pm

Re: My 406 Break - bought it for work, but already love the car

Post by joydivision »

UPDATE: just got the car back from A/C specialist, it's working!!! And this time, really well, gives that "Siberia-alike" feeling ;).... Let's absolutely hope and keep fingers crossed that it will finally STAY like this... they changed the dryer as instructed, purged and charged system, also added detector product (which they always do, he explained). I checked during operation and it looks all good: one of the tubes is warm while the other is ice cold, even showing condensing water on it. Compressor doesn't make any strange noises, runs warm to touch and no oil visible. It's much colder than with the old compressor, so I guess it was not only leaking but also not working well, or, the guy didn't even attempt to do the job well - probaby only changed the compressor and charged the system, proof of this was that he didn't change the dryer. So, I'm really hoping it's finally fixed now.

Will report back in a week or so, hopefully all will remain fine then!
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Doggy
Mod with a 2.2 HDi, De-Fapped!
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Re: My 406 Break - bought it for work, but already love the car

Post by Doggy »

Sounds good. Well done. 8)
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (we shall see......)
joydivision
1.8 8v
Posts: 45
Joined: Fri Jul 02, 2021 7:18 pm

Re: My 406 Break - bought it for work, but already love the car

Post by joydivision »

9 days later the A/C is still working absolutely fine, so I'm pretty much convinced that I can stop worrying now and that the problem is solved :D

I'm now going to post a message which is easier to follow, with problems solved and still to solve, as I can't edit the original post.
joydivision
1.8 8v
Posts: 45
Joined: Fri Jul 02, 2021 7:18 pm

Re: My 406 Break - bought it for work, but already love the car

Post by joydivision »

DONE:

- Timing belt kit – changed by mechanic
- Water pump – changed by mechanic
- Metallic articulated tube to EGR – changed by mechanic
- Auxiliar belt, one tensioner and one spring – changed by mechanic
- Coolant – changed by mechanic
- Oil and oil filter – changed by mechanic
- Air filter – changed by mechanic
- Fuel filter – changed by mechanic
- Injectors cleaned by mechanic
- Steering assistance fluid – topped up by mechanic
- Pollen filter – changed by myself
- Right headlight fixation had broken off – fixed myself with cable ties
- Speedometer had erratic failure (needle dropping to zero) – repaired by myself, was the Bitron
- Right bonnet hook not releasing well – broken spring, installed improvised substitute by myself
- Bonnet gas springs defective, bonnet not staying open – changed by myself
- Electric mirrors not working – repaired by myself (installed manual bypass, as memory function is defective)
- Blower motor would only work on full blast – repaired by myself (one wire was not connected)
- Engine randomly shuts off during driving – repaired by myself, was the ignition switch
- A/C not working – leaky compressor, was changed, as was the dryer filter and system was charged by A/C specialist, works fine now
- Bulbs gone on clock and MFD – changed/repaired by myself
- Front speakers had bad sound – they were defective, changed them, fixed!
- Changed the radio head unit for a CD one – done by myself
- Cleaned with contact spray most of sensor connectors in engine bay and all fuses and some connectors inside of car – done by myself
- Rear seat belt was too short for child restraint system - bought a seatbelt extender (only the buckle), it works perfectly.


TO DO:
- Rear brake discs – to be changed maybe in some 10 k kilometres
- One of the rear doors sometimes doesn’t open with central locking – lubrication helps, but it sometimes comes back. Ideas?
- On cold start, you have to crank while holding throttle down at 25% - this is related to BOSCH pump conversion, they didn’t adjust the cold start advance correctly. Might eventually try to figure this out by myself, Haynes has this covered. Not a priority, though, as it always starts quite well with this trick.
- Outside temperature sensor defective – will order a simple 3,3k NTC and install it with parallel resistor (as I found out on Internet and was able to prove by experimentation) , cheaper and no need to dismantle mirror.
- Locks of the doors even with lubrication sometimes enter “free rotating security feature” mode, but after a few tries, they always work – is there any permanent solution to this? Might this be the key itself? Both keys are quite worn.
- Central locking remote is not working – I tried to repair the remote control in key, it now has working button and the LED goes on, but car doesn’t respond. Tried all and every synchronization instructions from the Internet to no avail. Heard about broken antenna on receiver, have to try on different places. Might also be the remote that’s not sending, might try with oscilloscope. Might even just buy a chinese new system and install it – maybe much easier…
- Rear speakers no sound – also defective, will change them eventually
- RPM counter not working – I did overhaul and repair instrument cluster, but this problem was not fixed. I still have to check the crankshaft/TDC sensor, as apparently in this model it’s only used for RPM measurement? So it would not cause other problems? Or am I seeing this wrong? Might measure with oscilloscope where signal goes to cluster. This takes time which I don’t have right now. I also can't seem to find the damn sensor...
- There’s a small but annoying oil leak somewhere at the rear of the engine – my mechanic thinks it could be somewhere close to the Turbo, difficult access. But I’ve been looking at the very oily connections between upper and lower inlet manifold, might very well come from there, I will change short rubber connection tubes by myself some day and this will make certain if the leak comes from there or not.
- Thermostat might be stuck open? On colder days, engine doesn’t warm up past 72/75ºC, only if you push hard for it, then goes to 85, but later goes down again. Both tubes on the left side of radiator warm up at the same speed after cold start, upper one should warm up later only after thermostat opens? The thermostat on 2.1td is located underneath/behind the waterpump on left side of engine block, car must be jacked up. Find out if other parts have to be taken off. Buy axle stands and learn how to bleed cooling system. Definitely worth doing at home due to labor envolved. Needs time...
- Resolve parasitic noises, one in wind shield on drivers window, the other under passengers seat, and one is the sun roof cover.
- Sun roof doesn’t work – this will stay like this, as connectors are disconnected and I don’t want to risk that it might get stuck open, in case mechanics is defective, as there must be a reason for having them disconnected.
- Triangles of wheel support are in a bad shape (don't know the correct term in English), have them changed by mechanic before going to yearly inspection (the equivalent for MOT).
- Adjust nozzles of wipers to better aim at the windshield, change wipers blades, rubbers are dead.
joydivision
1.8 8v
Posts: 45
Joined: Fri Jul 02, 2021 7:18 pm

Re: My 406 Break - bought it for work, but already love the car

Post by joydivision »

So, just returned from a nice trip with my family, we took a few days off. In total, drove around 1000 kms. The car behaved flawlessly :)
Also a very acceptable average of 6,8 lt / 100 km with A/C on most of the time.

I learned something these days: the "cold-start" issue after all is not related to the cold start advance adjustment of the fuel pump. It's something else, I think I've read about it on the net, it is related to fuel going "back" to fuel tank, leaving pump unprimed. That's how I discovered that I had mis-diagnosed this: on our holidays, I parked the car on a steep hill, pointing the front part upwards. On the next morning, I wanted to start it and it wouldn't start, not even with the throttle trick, it needed a lot of cranking and finally started with a lot of smoke. Clearly fuel starvation, it's pretty obvious that the fuel had somehow ran back to the fuel tank, leaving the fuel pump unprimed. I could have used the manual priming pump, but as it started to reach fuel after some cranking, I didn't. So, this confirms that the cold start issue I experienced, is not due to wrong adjustment of fuel pump, but fuel returning to tank if car is not left parked levelled for a longer time. I tested this in two ways: parked the car in the opposite direction on the same steep hill (nose pointing downwards). Started perfectly the next morning. Then, the other day, my wife used the car and didn't remember the "25% throttle trick", instead just turned the key and it started flawlessly after two revolutions of starter motor, perfect. Reason: it was parked levelled. This is in line with what I've read on the net: some of these XUD engine based cars suffer from this issue, and there are some folks who implement a non-return valve in fuel lines. So, I'd like to hear your opinions on this: is this easy and quick to do for a mechanic or might it be difficult to access? What about the non-return valve - any special indications? Should I just ask the mechanic to take car of all this, including purchase of the valve? I'm asking this, because although it would be nice to have this solved, it isn't really a significant problem, it's quite easy to go around it, parking the car correctly, and I really don't want to spend much money on this, I've got other priorities with this car right now. Also, I'd like to know if installing a non-return valve can bring other problems eventually (because if it would be that obvious, I guess they would have installed it factory-side, no?).

Thanks in advance.

On another note: I managed to adjust the nozzles of windshield wipers perfectly and also cleaned them, with a needle, they actually allow adjustment, it's really nice! :cheesy:
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