D24tic
 

Hi!I am new at the forum and I have a few questions about my 1995's 940tic auto saloon:

-First of all, this is my first auto and I was concerned about its idle speed. When hot it's around 900rpm and when cold it's around 1500-1600rpm in P or N, since in D or R, with the brake on, it slows down to 750rpm and 1200rpm respectively. Is this normal in automatics?

-Other thing I had stated a few times was that in hot summer with the break on, airco on and the lever in D the revs fall to near 500rpm and the car starts to shake and plum black smoke between shakes. Nowadays on cold morning starts it started to do something like that on the first seconds and it smokes more than I remember on a cold start! When it shakes the revs oscillate a little! Any Ideas of what could be?

-At last, there is a hose from the top of the engine to a pipe in the middle of another between air filter and turbo. Between both there is a large oil leak and the first hose is loose. Shouldn't be there a pipe clip or something to attach both?

I will appreciate your opinion!

Thanks

P.S. There is a leak around injector #3 from the fan, I thought it was from a leaking return line substituted a few months ago but it seemed that grew. Could that be related to shaking?

Viva, caro companheiro luso

Não conheço no fórum português quem tenha turbodiesel, só um atmosférico...
Na minha garagem em Gaia mora um 744 turbo intercooler com B200ET, e também não pesco muito desses D24TIC...
Julgo que o respiro do óleo deva ter braçadeira, caso contrário configura o aspecto de fuga que referes. Por outro lado, os abanões em ralenti carregado (AC e caixa auto D) podem advir do injector com fuga, cujo ponto fica afectado...

Cumprimentos,

Telmo

translation: sorry, nothing but a portuguese talk, world's 3rd language spoke...

Saudações,

Não estava nada à espera de uma resposta numa língua tão familiar... O que me preocupou no tubo de respiro foi o facto de nunca ter tido uma braçadeira e só ter começado a verter óleo agora...

Agradecido.

Translation: replying previus post.

Viva

Só a idade do tubo é suficiente para começar a deformar, além do calor que o motor emana. Por outro lado, atendendo ao facto da pressão dos gases do lado do cárter estar intimamente ligada ao fenómeno de "blow-by" dos êmbolos do motor, será sinal do desgaste da vedação dos mesmos, quem sabe?
Já li neste fórum que "if it works don't touch it...". Por mim seguia para mais uma fornada de quilómetros.

Telmo

translation: probably some "blow-by" can make a breather pipe leak some oil...

d24tic,

Vai a
http://www.volvoclub.org.uk/faq/EngineDiesel.html

Fantástico!

translation: no translation needed

Well, seems that the next thing to do is check injector #3 and, eventually, do a compression test (depending on the bill)!


Still remains if the breather pipe has a pipe clip and if the idle is the correct one.

Obrigado pela dedicação, tem realmente ajudado! (very grateful for Telmo's help and concern)

Update: Before went to a workshop I clean the area and there is no leak on the #3, this leads me back to the beginning... There is also no sign of blow-by from the cap on the top of the valve cover. I need some advice what to do next (avoiding unnecessary expenses)!

Well, I can see you did not perform the compression test, that should help to make an idea of the engine wear, but does cost few dozen euros...
Besides, you can also check (in a test apparatus) the injectors for clogging/bad spraying - can also cause the poor idle and black smoke in D selection/AC on.

Translation: há mais algum português por aqui no fórum? abraço para todos os companheiros volvistas de cá e lá.

Tickover speeds
 

Correct idle speed when warm for D24T/Tic, is 830rpm
Correct idle speed when cold for D24T/Tic is at least 200 rpm more than when warm.
If your car is smoking when cold (blue/grey smoke) then the cold start device is not advancing the injection timing enough. That is to presume all other things are oK, ie fuel pump injection is set correctly, injectors are set correctly, air filter is good, etc, etc.

Cold start device justs increases fuel supply as there is no adjustment on timing as it is a diesel. For the same reason there is no throttle controlling airflow, it is wide open all the time.

All the best, Peter.
:car-smiley-031: