× Willkommen im Forum 107!

Hier dürft ihr all die Experten zum R107 SL und C107 SLC alles fragen und werdet fachkundige Antworten erhalten.

450 SL -75 US version (D-jet) way too high CO (8 !)

  • pholmqvist
  • Autor
  • Offline
  • New Member
  • New Member
  • 450 SL USA 107.044 1975
  • Standard (Europa)
Mehr
30 Jul 2020 22:21 #254122 von pholmqvist 450 SL USA 107.044 1975 Standard (Europa)
ej!

I have had this car just 2 months and it has just failed its MOT due to too high CO 8 (should below 4) whilst idling.

Actions so far:
New thermostat/oil/temp sensor plus checked plugs/distributor/trigger points/vacuum hose/cold start valve. Today I tried lowering CO by turning the knob on the ECU whilst at a garage - the CO did not change a bit despite turning the knob.

Anyone had similar issue? Could it be something with the throttle switch? Any ideas appreciated.

Regards
Patrik

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
31 Jul 2020 07:19 #254131 von Obelix116
...if you can`t change the CO on the ECU, first thing to do is to adjust the throttle Switch !

Gruß
Christian

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Dr-DJet
  • Dr-DJets Avatar
  • Offline
  • Moderator
  • Moderator
  • 450 SL 107.044 1973
  • Schweiz
Mehr
31 Jul 2020 13:17 #254151 von Dr-DJet 450 SL 107.044 1973 Schweiz
Hi Patrik,

your are actually on the wrong of my 2 web sites. My D-Jetronic web site shows how to adjust idle-contact on throttle switch: jetronic.org/en/d-jetronic/maintenance#Leerlaufkontakt

Only when that one is closed in idle-run rheostat on ECU will work. Having said that the next probable issue will be a detuned MAP sensor. It is a nightmare on US cars. If you notice that the black cap on your MAP sensor is missing, askew ... : Then someone has detuned it on the screw. I have seen and retuend many such MAP sensors during our workshops. Some are even leaking vacuum after they have been detuned and some are irrepairable. Especially the ones that were sold by Daimler from 90s and early 2000s production in France by Bosch could be completely wrong.

Viele Schraubergrüße - best regards, Volker alias Dr-DJet und K-Jet Forscher, Admin und Betreiber dieser Webseite
Alles über D-Jetronic und Zündung auf jetronic.org

Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.


Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • pholmqvist
  • Autor
  • Offline
  • New Member
  • New Member
  • 450 SL USA 107.044 1975
  • Standard (Europa)
Mehr
07 Aug 2020 11:36 #254697 von pholmqvist 450 SL USA 107.044 1975 Standard (Europa)
Hej!

Sorry for delay - been away on mini vacation.

After adjusting the TPS the "knob" on the ECU does now have an impact. A HUGE thank you for the advice.

Whilst driving to the garage yesterday to test CO I ended up in 15 min queue having to idle - engine died. Eventually got i going with starter cables. Got back home not able to start. Charged battery but no luck. Used starter cables again and it did fire up. So battery probably gone.

I also noticed that the temp gauge needle is only moving slightly. Thermostat is new and I have done basic test on thermo time sensor, aux fan sensor and EFI water temp sensor. Is there another sensor for the temp gauge in instrument cluster?

Kind regards
Patrik

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Dr-DJet
  • Dr-DJets Avatar
  • Offline
  • Moderator
  • Moderator
  • 450 SL 107.044 1973
  • Schweiz
Mehr
07 Aug 2020 16:00 #254721 von Dr-DJet 450 SL 107.044 1973 Schweiz
Hi Patrik,

yes there is a separate sensor just for water temp display.

Viele Schraubergrüße - best regards, Volker alias Dr-DJet und K-Jet Forscher, Admin und Betreiber dieser Webseite
Alles über D-Jetronic und Zündung auf jetronic.org

Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.


Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Moderatoren: Ragetti
Ladezeit der Seite: 0.046 Sekunden
Powered by Kunena Forum