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W126Club.nl • Moeilijk-start-onderwerp : Techniek
Pagina 1 van 1

Moeilijk-start-onderwerp

BerichtGeplaatst: 29 jun 2017, 16:07
door Mbmb
Ik weet dat dit vaak de revue heeft gepasseerd en t meeste heb ik al gelezen, maar toch dit:

Ook ik heb onlangs dit probleem bij warm moeilijk starten. Heb nieuwe drukregelaar, perfecte sproeiers etc.. heb wel ondekt dat druk verdwijnt uit de luchtklep bij de spinnekop. Weet alleen niet of dit zo hoort? Met andere woorden, als de motor uitstaat zou de luchtklep moeten terugveren (door rest brandstofdruk in t systeem) als je deze indrukt of niet?

Wellicht een topic om een keer uitgebreidt te behandelen door een van onze W126 Bosch Jetronic experts ?? [WINKING FACE][WINKING FACE]


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Re: Moeilijk-start-onderwerp

BerichtGeplaatst: 02 jul 2017, 09:09
door 126
Blijft jouw stuwschijf dan hangen als je hem naar onder drukt?
Als dat zo is dan is er iets mis met je spinnekop

Re: Moeilijk-start-onderwerp

BerichtGeplaatst: 02 jul 2017, 16:23
door Mbmb
Als ik de motor uitzet dan kan ik de stuwschijf indrukken en veert keurig terug, maar als de motor een tijdje stilstaat dan veert ie niet terug...


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Re: Moeilijk-start-onderwerp

BerichtGeplaatst: 02 jul 2017, 18:32
door Leeflang
Er werken 4 krachten op de stuwschijf:
F1 - door de aangezogen lucht
F2 - door de stuurdruk in de brandstofverdeler
F3 - door zijn eigen gewicht
F4 - door een contragewicht
Als er geen lucht aangezogen wordt hoort volgens mij het contragewicht de stuwschijf te sluiten, onafhankelijk van de benzinedruk.
Zelfs als de brandstofverdeler van de luchtmassameter verwijderd is hoort de stuwschijf door het contragewicht gesloten te worden.
F2 kan weliswaar helpen de stuwschijf te sluiten, maar dat is slechts een bijverschijnsel.
Normaal gesproken is het juist die F2 die moet worden tegengewerkt om te zorgen voor benzine inspuiting en dat gebeurt door F1.

Maar er is natuurlijk ook nog zoiets als wrijving in de as van de stuwschijf (rood op de tekening).
F4 is maar een klein beetje groter dan F3, bij te veel wrijving zal de stuwschijf open kunnen blijven hangen.

Het open blijven van de stuwschijf is in ieder geval niet de oorzaak van verdwijnende druk, hooguit een gevolg daarvan, hoewel ook dat eigenlijk niet zou moeten.
lmm.gif
Er is trouwens een topic met een heleboel informatie over de jetronic: jetronic-t6058.html

Re: Moeilijk-start-onderwerp

BerichtGeplaatst: 03 jul 2017, 03:44
door Mbmb
Dank!


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