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Peugeot 406 Diesel Playing Up  
Peugeot 406 Diesel Playing Up - steveholden
I've just got my hands on a Pug 406 GLX turbo diesel. I have a few issues with it, here we go:

1) The speedo, keeps jumping, swinging, gets stuck at 0 etc. Although sometimes it does read out correctly. Also it stops reading the mileage, so i don't know what my mpg is like!

2) The Oil level gauge. On starup it goes right up to the top and then down again, then up then down. It then comes to rest at off. Is this what is should be doing?

3) Sometimes the rev don't display, and the display jusr flicks when i press buttons on the centre console. Also when you change gear the needle tends to drop rather than swoop.

4) The tape won't play tapes and swaps sides until it turns itself back onto the tuner.

5) The electronic climate control seems to have a off time as well. The Temp only goes down to 14 and also the fan speed can be a bit dodgy. Air con doesn't seem to work very well but I'm not fussed about that.

6) The rear screen element sometimes doesn't work.

7) When pulling away in lower gears it seems very slow and has trouble getting upto 35-45 mph. If you dont push the gas it seems to pick up faster. It's has new glow plugs and the clutch insn't slipping. Once your past 40mph it's a breeze and no problems pulling away. You put your foot down but not a lot seems to happen. The engine rev increase but not to the point where it sounds like the clutch is havnig an off day.

8) Oh and I'm not sure but i think the fan isn't cutting in.


Apart from that a very nice car.

Any ideas. I've seen the other posts about checking the earth's on the car which i'll do. What about the ECU?

Many Thanks In Advance

//Steve

Tags: technical issues oil diesels fuel economy

Peugeot 406 Diesel Playing Up - Dorian
With all the problems you've got with the dash, it sounds like the voltage regulator for the dash is playing up.

Is the turbo working?

Dodgy glow plugs won't affect the acceleration, only cold starts.

How much did you pay for it? I hope it wasn't much...
Peugeot 406 Diesel Playing Up - steveholden
Yes the turbo is kicking in.

Acceleration is really weird, it feels as if there's a flat spot at lower revs. Once you get above 1800rpm your off and running. And this is the really weird bit. If you don't press the gas is pulls away quicker than if you hammered the gas. Very weird.

Paid nothing for the car.
Peugeot 406 Diesel Playing Up - BrianW
"When pulling away in lower gears it seems very slow and has trouble getting upto 35-45 mph."

If the gear ratios are the same as on the 405, first and second are slightly too far apart, so you need to hold first a little longer (than the other gears) to get decent revs. in second when you change up.

HTH
Peugeot 406 Diesel Playing Up - PhilW
"Yes the turbo is kicking in.

Acceleration is really weird, it feels as if there's a flat spot at lower revs. Once you get above 1800rpm your off and running."

isn't that because the turbo only kicks in at 1800-2000 revs? Don't know about all the electrical problems but is there a common earth involved?
PhilW
Peugeot 406 Diesel Playing Up - ChrisV
Steve,
Phil W is correct, these engines are utterly gutless in a 406 below 1800 rpm. Try changing up from 1st around 3500 rpm, see if this improves things.
Chris
Peugeot 406 Diesel Playing Up - steveholden
Just taken it out as as you said gave the gas a push, and yes it did improve it. so it's most likely me. I've never had a smoker before so i'm not sure of it's habits. but seem to be gettinf fairly decent mpg. i take go to work in it and thats 100 round trip on the motorway so it will sit ther quite nicely. also this afternoon the radio just turned itself off and wouldn't come back on for about 10 mins. Is this related to my other strange electrical issues? Apart from getting a NASA sparky in, any common things i should be looking for?

Ta

//Steve
Peugeot 406 Diesel Playing Up - Mr Smegma
Have you checked to see what the voltage is on the dash power rails?

Might be worth sticking a meter on it when your driving and get someone else to watch and see what happens. Could be flying all over if it's a duff alternator regulator or whatever.

Lots of electrical problems like this suggest a common fault and PSA started to get into lots of wire sharing. So there may even be a single power rail thats supplying all of the dash including radio etc.
Peugeot 406 Diesel Playing Up - steveholden
No but i'll add that to my list of things to check. I'll need to check the wiring diagrams in the haynes manual and see if anything pops up. When the speedo does it's thing the mileage doesn't change but still remains up there, would this be any clue to the issue? Adn the oil gauge, where should it come to rest on a ( Normal, hah ) 406?

//Steve
Peugeot 406 Diesel Playing Up - Dave_TD
Diesel sluggish under full throttle, but seems OK under light throttle opening? Is it kicking out loads of thick black smoke when you put your foot right down? Sounds like you need to drain or replace the fuel filter element, it's probably full of water.
It should work a little better if you brim the fuel tank, strange but true, because there's no (humid) air in there then, just diesel fuel.

How many miles has it done?
Peugeot 406 Diesel Playing Up - PhilW
If your oil gauge is the same as on a BX, when you switch on the ignition it goes up because it is showing oil level (though I trust the dipstick more)It then drops. When you start the engine it shows oil pressure I think so that is checked. Having done that it goes back down to zero. On some models it only checks level (as on my TGD) but i think on higher spec models it does have this pressure test. Others will no doubt correct me!
PhilW
Peugeot 406 Diesel Playing Up - PhilW
Oh, and by the way, the fan on BX diesels hardly ever switches on even in hot weather when towing a caravan - they seem to have an oversized rad. Easy way to check whether fans actually work is to short across the contacts on the sensor (half way down the side of the radiator) with a screwdriver which should switch it on. Course it could be the sensor that has gone - they are cheap and easy to fit.
I'm assuming in all this that the 406 diesel is the same as the BX!! If not, sorry and hope I haven't mislead you!
PhilW
Peugeot 406 Diesel Playing Up - steveholden
It's had a new rad about 2000 miles ago, brand spanking new! and eys the thing is huge! I assume the fan is in front of the rad otherwise they forgot to put in back in!

//Steve
Peugeot 406 Diesel Playing Up - steveholden
No it isn't pumping out any strange stuff. But the fuel filter sounds like an option ( and cheap, i hope ). The cars done 95k. The one really good thing about it is the ride. Before this i had a nissan sunny 1.4 had the ride quality of a sherman tank going over a 2ft rumble strip! I've got hold of a mate whos coming down and having a look at it this weekend ( and just happens to be a diesel mechanic!) So he'll give it a good once over, I can point him in the general direction that everyone here seems to think maybe the problems. I don't really want to take it to a peugeot dealer. You can just see the cash signs popping into there eyes when you mention the electrics are up the spout! What should the normal operating temp be on these things? If i'm stood in traffic ( Which i usually am going down the M1/M25 ) it gets to about 92 normal driving it settles down to about 83 ish. Does this sound right?

//Steve
Peugeot 406 Diesel Playing Up - PhilW
Those temps sound about right - in fact I think the fan is designed to cut in at low speed at 92 and at high speed at about 100. If it sticks at 92 in traffic your fan may be on but you can't hear it!
Don't quite understand your point about climate control and "temp only goes down to 14 degrees" - how cold do you want it??!! Most CC don't go down this low (Xantia min is about 16 I think) Also fan (Air con) speed is thermostatically controlled so will vary depending on the cooling/heating it has to do to get it to set temp (if set on auto) I qualify all these statements with "I think"!!
PhilW
Peugeot 406 Diesel Playing Up - steveholden
Sorry 14 degrees does sound righ tbut when you have strange things popping up on your dash your not sure what to trust. The coolant warning light came on then went off, on, off etc. Stopped has a look and indeed the level was a bit low so topped it up and all was fine, but i'm taking everything that the car tells me with a pinch of salt!

//Steve
Peugeot 406 Diesel Playing Up - Andy22
I have a fellow high mileage pug 406 diesel, and some problems are simialr to mine.

To be honest whithout depressing you, i've had nothing but problems.

Anyway, i had a b*****ed cooling fan i had to take it to the peugoet garage and it turned out to be the air con, surprise surprise!!
£100ish to fix, which wasn't to bad i thought, normal running temp of 80 degrees, the fan should cut in at 95ish mine went up to 110 once until i got moving again and thats when i realised their was problem.

Also my rear windscreen dimister doesn't work, well it has once in 10 months, but the wing mirror one's work.

mines a 1.9td so i haven't got the oil gauge.

Double check you cover on the bottom of the car under the bonnet for leaking coolant if you warning light came on recently, i also had that problem, a leaking hose, unfortunatly it split 3 ways so another £100 to fix.

happy motoring!!!!!!!
Peugeot 406 Diesel Playing Up - Mr Smegma
I've read about problems with the cooling fan on xantias with aircon. Something to do with a relay near the fan that dies.

Might be worth checking because it's a very quick cheap fix, hence why the dealer charged andy22 around £100 - would probably cost you about £20.

If it's the same (probably is) there are two relays that control the fan's two speeds and they're not terribly well protected so the contacts corrode.
Peugeot 406 Diesel Playing Up - Mr Smegma
Steve, something's just occured to me. On many cars the rev counter uses the alternator for engine revs and the rev counter not working could be a sign of the alternator on it's way out.

If it is then it could be throwing rubbish across the power rails.

You could always disconnect it and go for a SHORT drive running off the battery and see what happens.
Peugeot 406 Diesel Playing Up - steveholden
Thanks for that. It seems there is something very common with all these faults. They all seem to happen one after the other. when the speedo doesn't work then i don't seem to have many other faults. Or when something else goes wrong the speedo pops back! ALso I'm not sure if the rev counter is reading the correct level. I have now found out the diesel engines tend to rev lower than petrol engines, but when i'm going down the mway the revs seem to settle about 1800 in 5th ( about 65 ish, when it works! ) does this sound right?

//Steve
Peugeot 406 Diesel Playing Up - Dave_TD
That would work out at 36mph/1000rpm in top, which is a bit high even for a diesel... Diesel engines DO rev lower than petrols, but as a rule my Octavia idles at 900rpm, pulls strongly from 1400-2800rpm, and is out of puff by 3500rpm. Will red-line at 4500rpm though, but there's very little point in running it that fast, other than for the reasons given in the "running-in diesel engines" thread.
Peugeot 406 Diesel Playing Up - Andy22
Anything over 3000rpm is pointless, smokey and noisy.

Use plenty when pulling away in first though, if you use the idle speed you jolt forward putting you out in danger then try to put a little gas down and nothing happens, i little dangerous i feel. I gas it to 2500rpm and then lift the cluch up, quite swift and safer.

5th gear overtaking at 60 is brisk so thats the only real benefit of the engine.

incidently consirdering the demister on my wing mirrors works, what could be the fault on the rear windscreen?
Peugeot 406 Diesel Playing Up - andy sully
In the hand book 83degrees is the normal running temp for the 406
and the fans should cut in at round 100 degrees
to test the fans are working, have the engine running and turn on the air con.
Peugeot 406 Diesel Playing Up - Ian Cook
8) Oh and I'm not sure but i think the fan isn't cutting in.


Steve

Lots of useful advice in this thread, but I'll relate the outcome of fan problems on my Son's 306 diesel (because it's a Pug and might have similarities).

His fan didn't cut in when it should have. I checked all the fuses, and was baffled by the relays - they didn't match the scheme in the Haynes manual.

I took the car into the Pug main dealer and they fixed the fault. It was caused by corroded connectors in the wiring harness behind the front bumper. That would have taken me some effort to find. I was going to have to resort to changing out relays until I hit the right one, but I didn't have a duff relay.

Enjoy!

Ian Cook
Peugeot 406 Diesel Playing Up - deere3350
You got off lightly - My 306 had exactly the same problem with corroded connectors. The wiring harness caught fire on mine when the fans tried to come on. Cost a b***** fortune to fix.

>> 8) Oh and I'm not sure but i think the
fan isn't cutting in.
Steve
Lots of useful advice in this thread, but I'll relate the
outcome of fan problems on my Son's 306 diesel (because it's
a Pug and might have similarities).
His fan didn't cut in when it should have. I checked
all the fuses, and was baffled by the relays - they
didn't match the scheme in the Haynes manual.
I took the car into the Pug main dealer and they
fixed the fault. It was caused by corroded connectors in the
wiring harness behind the front bumper. That would have taken me
some effort to find. I was going to have to resort
to changing out relays until I hit the right one, but
I didn't have a duff relay.
Enjoy!
Ian Cook
Peugeot 406 Diesel Playing Up - Paul Mykatz-Tinks
"Enjoy!"

Aaaargh.............. !
Peugeot 406 Diesel Playing Up - andy sully
The temp on the climate only goes down to 14, ifit still doesn't get very cold you might have to get the air con system recharged which shouldn't cost much more than £50 (according to a mate who had it done on his Jeep)
Peugeot 406 Diesel Playing Up - Reggie
Is your 406 a 2.1, or a 1.9? The 2.1 has quite a narrow power band starting at about 1800rpm to 3000rpm, but is flat until you get to 1800. If yours is the 2.1, the speedo problem may be caused by a faulty "interface" located under the n/s passenger compartment. This is known to cause speedo problems on the 2.1, but with all of the things going on with your dashboard, maybe it could be one of the other "cures" mentioned above.
Peugeot 406 Diesel Playing Up - madf
reading this I know why I no longer buy Pugeots:-)
madf

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