anti-stall, fast idle speed etc on 306xtdt

Hello

I have had my peugeot 306 xtdt for about 4 months and was just intrigued to
learn more about diesels etc.

Can anyone tell me exactly what the purpose of the anti-stall and fast idle
speeds are?

I haven't got any probs with the car and believe the speeds are correct, I
just want to learn more about the dang thing cause it's great!

Cheers,
Rich

 

You should buy the Bosch Technical Manual. It's Bosch no. is 1 987 722
164 and it's ISBN is 3-934584-38-1. http://www.deltapressltd.co.uk
It's about £15.

The fast idle ups the tickover by 100revs for cold starting. It's done
on the early engines by a cable from a block in the side of the
thermostat housing. The effect of the cable is to advance the
injection point. I can't find a reason for the anti-stall because
Bosch don't use that term in the book.

 

Hello,

I don't really agree with Yeha's answer, the fast idle plays on throttle to
speed up engine (about 100RPM, I agree) for cold start. It's now fully
automatic with a cable (manual command on older Diesels), or by ECU (on HDis
for example).

What you call "anti stall" is known here as "Torque regulator" ("régulateur
de couple") and is intended to maximize low revs use in drive. With that,
you can start just with clutch and no throttle, run at idle speed on 1st &
2nd gears.
That's the reason why people often say "you can't stall with a Diesel".

 

Hmm on this topic I think I may have a minor developing problem on my
306TD.
My normal commute is around 50 miles each way - most of which is quick
motorway (M62, Leeds<->Hull). If I leave the car around 30 minutes
before going to restart it always start first time but very occasionally
it will struggle to get to normal tickover, normally varying between
500rpm and 1200rpm approx. This lasts only 3-4 seconds before it will
either stall or tickover will level off as normal. Pumping the pedal
makes no difference whatsoever, and if it stalls it always starts first
time next time and ticks over normally.

Anybody got any clues? It happens so rarely that I'm not going to
rummage around myself, but it could be something for me to ask my local
mechanic to check out at the next oil/filter change.

Thanks

 

If I leave the car around 30 minutes

I can't offer an explanantion, but I am interested - once, when I stopped
at a junction, the idle speed of my 205 TD oscillated up and down for
several seconds. It has never done it since, so I haven't had the
opportunity to try to diagnose what might have caused it. I'd be
interested to hear if anyone figures it out.

Andy

 

Air bubbles in the fuel line caused my 205 1.7d to have an erratic
tickover sometimes, could it be that?

Ollie

 

Hello Ollie,

I was going to tell the same. It happened twice to my brother ('91 205
DTurbo), due to cracked fuel pipes (once the pipe that runs under the
bonnet, once the one which is under the car, between tank & the steel pipe).

 

so basically - even on a really steep hill i still won't need any throttle?

 

Hello Ollie,

I'd agree except that it only did it once and hasn't done it once in the 6
months and 10000 miles since (self healing fuel pipes?
I did have a split fuel pipe a year or so ago - the rubber pipe which feeds
the fuel filter was split where it joins the metal fuel pipe from the tank,
but that just caused poor starting and hesitation, not a regular
oscillation.

all the best,
Andy

 

Hello,

Don't know...

.... but it randomly happened to my brother, causing poor start, and / or
oscillating idle, or slightly too high idle (if a 1000RPM is too high,
anyway it isn't far too high. Really a pain when it's at 2kRPM and you're
coming back to home at 3:00 AM).
He replaced cracked fuel pipes, no problem ever. So it could well be a way
to go. Not that a painful job, just count 1 or 2 meter of fuel hose.

Interesting point I guess, my '93 205 still hasn't this problem, although it
becomes a bit old - I mean, 10 years isn't that bad for a std quality
plastic part.