406oc.co.uk

Ok so the pug is sulking ,
symptoms random lack of power , if you ease of the throttle and gently re apply throttle she will return to full throttle (most times)
EM light is on with a code (from memory) of throttle position sensor .
My question is with the infamous electrical tomfoolery is this actually a likely candidate or is a MAF a more likely candidate ?
also any way of checking either of these items ?

If you've got an oscilloscope, check the two output lines from the throttle pot while pushing the accelerator. The voltage changes should be nice and smooth, otherwise the pot's dirty/worn

And if i don't have an oscilloscope ?

then your best bet will be to find one in a breakers yard

mjb wrote:then your best bet will be to find one in a breakers yard

An oscilloscope in a breakers yard?

Probably more chance of an oscilloscope than either a MAF or TPS.
BTW the throttle position sensor is where the throttle cable loops onto the throttle yes?

It's where the cable goes but it's remote from the injection system - over by the battery.

I've heard of MAFs giving issues but not TPSs (on HDis that is), worth squirting some carb cleaner through the MAF to see if anything changes?

Thats what i was wondering , also disconnecting the MAF to see if it sets on default and removes the problem .
I just don't trust the codes as on other cars i have spent a fortune replacing good bits because the fault code said they were duff when in fact it was some other part failing and causing the supposed problem

OK sooooo sprayed some carb cleaner down the MAF and its better but still not right, However she is sluggish (slightly ) up to 1800rpm then away she goes pulling like a train then runs out of steam at about 4000 rpm . this i can live with
Interestingly when i now unplug the MAF it runs exactly the same so i am thinking suspect MAF failure , EM light is still on (maf plugged in) and giving TPS failure

moonshinespecial wrote:she is sluggish (slightly ) up to 1800rpm then away she goes pulling like a train then runs out of steam at about 4000 rpm

Lol normal behaviour there then mate ;)

It would be worth changing the TPS from a scrapper as it is easy to swap, but really the ecu flags an error code if a sensor fails self-test so something is not right with it. Also I see where you are coming from with the MAF, but you cannot tell what voltage the MAF is outputting for a given airflow, or if the MAF is in the critical sensor group or not, as this will determine whether it runs at all with no MAF, or just wont idle, or will idle but not rev, all ecu's use the MAF data in different ways.

To check your TPS get a meter and measure the following:

Allocation of the connector channels :
Channel 1: Output signal 1.
Channel 2: Output signal 2.
Channel 3: 5 volts.
Channel 4: Earth.

Accelerator pedal released :
Voltage between earth and channel 1: 0.5 volt.
Voltage between earth and channel 2: 0.28 volt.

Accelerator pedal pressed fully down :
Voltage between earth and channel 1: 3.35 volts.
Voltage between earth and channel 2: 1.6 volt.

If you have readings outside this then the TPS is faulty. The output voltage rises with throttle angle, and channel 2 is always half channel 1 value, this is how the ecu determines a faulty TPS if the channel voltages do not match this condition.

Thanks for the info me and the multi meter will be outside as soon as the rain stops .
interestingly cant find another hdi110 in any scrap yard within fifty miles , this means either they are all running of not even a scrap yard will touch them

Ah....I went to find an injector the other day at a very large breakers near here, the guy laughed when I asked about a 406 HDi. I said "whats funny?" to which he replied "we dont touch anything off a pug diesel mate - we get big money exporting them whole" !!!

I was gobsmacked - no 406's, no HDi's at all.....but citroen and fiat are the same engine / injection system in some cases so you may get a tps off a fiat scudo or some such, tho I wonder where the bloody scrappies are sending their HDi's to? Africa? He wouldnt say!

Various vans (boxer, scudo, partner, doblo, berlingo and all citroen) in scrapyard also a good potential source of HDi parts maybe? At least you dont have to find a 406 as the parts are used on a lot of motors now.

FlySpeck wrote:Ah....I went to find an injector the other day at a very large breakers near here, the guy laughed when I asked about a 406 HDi. I said "whats funny?" to which he replied "we dont touch anything off a pug diesel mate - we get big money exporting them whole" !!!

I was gobsmacked - no 406's, no HDi's at all.....but citroen and fiat are the same engine / injection system in some cases so you may get a tps off a fiat scudo or some such, tho I wonder where the bloody scrappies are sending their HDi's to? Africa? He wouldnt say!

Various vans (boxer, scudo, partner, doblo, berlingo and all citroen) in scrapyard also a good potential source of HDi parts maybe? At least you dont have to find a 406 as the parts are used on a lot of motors now.

I noticed that too, for such a common car there are no 406 HDis in the Scrap yards! The big scrap yard in Armagh has more Porsches than they do 406 HDis!

That is strange. Where are all of these 406 HDis being sent to? Is there a top secret conspiracy that they're such good, economical cars, that the car companies and oil companies are buying them all up and hiding them? Like they did with the W123 Merc?

Could be the likes of Iran, they like their Peugeots?

HDis are all over the place, Citroens are usually a good source. Just make sure the part numbers match! Things like fuel filter housings can differ greatly! Also, some Fiats / Alfas use their own JTD diesel which is shared with GM / Saab, so make sure it looks HDi-ish

I once got a TPS for the Xantia off a Vauxhall Carlton in a scrappy. Same part number, worked perfectly!

they are sending boat loads here, literally

my local scrappy has nothing but uk plated motors in, u can see why when a 10 year old 406 hdi is worth about 3 grand (pounds) here

Why is there such demand in Poland? And why specifically 406 hdis? Why not C5 hdis, Volvo diesels etc.?

You can have mine for £2.5k!
New cat and com2000 recently fitted