× Die Bosch D-Jetronic war 1967 die erste Großserien elektronische Einspritzung der Welt. - Bosch's D-Jetronic was the first mass-production electronic fuel injection.

Topic-icon engine shut off on drive

Mehr
20 Sep 2017 22:29 #8062 von TomasLT
TomasLT erstellte das Thema engine shut off on drive
Hello,

my problem is 350 slc, automatic, 1975, W107, D Jetronic. I have few questions regarding regulation:

rough idle, I should set idle to 1300 rpm on Parking mode and by switching to drive mode rpm drops to 700 rpm or less, engine works weak;
then I start driving, turning a steering wheel with AC on or off, parking the car engine often shuts off;
rich runing, bad air fuel mixture, how to lean mixture ? I wondered that with fuel pressuere 1,5 bar engine works better on idle, leaner, but still shut off on drive mode.


thank you for your advice
Tomas

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
20 Sep 2017 23:17 #8063 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Hi Tomas,

thanks for bringing it to forum. Your mixture seems totally wrong. Otherwise engine would have the power to run at 750 rpm. 1300 rpm is for sure too high. Engine can drop 50 to 100 rpm when switching from N to D on automatic gearbox. The reason seems to be fuel excess as you can smell it.

Now what can be the reason? Either it is false air, or broken MAP sensor preferably with misaligned idle-run switch. A mistuned ignition can also create an engine to have no pwer. But then it would not stink with excess fuel.

Now reducing fuel pressure is an absolute NO GO !!! Don't do that. You would correct a wrong mixture in idle and part-load but also ruin mixture at other loads and rpms. You would even risk your engine when it runs far too idle at another load point. It can overheat from lean mixture.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
21 Sep 2017 20:34 #8064 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
Hello,

I should start from a very begining
some years ago my engine with no. M116.982 , year 75, was in bad condition cylinders compartment - scratches in cylinder, blue smoke.
So I decided to change engine, we swaped with engine M116.985 from a later model, from year 76 and up. We changed just a cylinder block, fuel injection left the same dJetronic.
engine has a good power, compression is even in every cylinder, everything is ok except bad mixture and Drive mode failure.

Question: does such engine blocks interchange is technically compatible and can affect or no affect air fuel mixture and possibility to adjust dJetronic properly ?


Thank you for your answer

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
21 Sep 2017 21:34 #8065 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Hi Tomas,

block and main shaft should be identical. Changes should be in cylinder head and maybe pistons. Did you verify that your mainfold is air-tight after mounting it. Let us know what vacuum level you have on idle (750 rpm).

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
21 Sep 2017 21:58 #8066 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
Hi Volker,

all manifold rubber parts are changed and new, we tested for leakage , no air leakage. We'll check vacuum level on idle , what is correct vacuum level ?

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
21 Sep 2017 21:59 #8067 von Volker
Volker antwortete auf das Thema: engine shut off on drive
A good engine should bring -0,5 Bar.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
21 Sep 2017 22:29 #8068 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
thank you
In the whole, we have done the following:
timing adjusted
trigger contacts corrected with Norbert tool and advice
MAP sensor is in good condition from a working car, but not tested for vacuum leakage, certainly we'll do this
temperature sensors are tested at pins, they are good, wiring seems ok , if I unplug sensor connector on working engine that make sense;
injectors tested
all component numbers are correct

what we need is to lean a mixture, now we are going to do a manifold vacuum test and MAP sensor vacuum test.
If these tests pass, what a next step ? - we think to adjust MAP sensor or to install a Megasquirt :)

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
22 Sep 2017 00:00 #8069 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Did you check temperature sensors on ECU connector? If vacuum is okay and MAP sensor holds vacuum, is sealed and has rivets, then we have fuel pressure and ECU lef for the symptoms you describe.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
22 Sep 2017 10:00 #8073 von Volker
Volker antwortete auf das Thema: engine shut off on drive
And of course engine timing could be wrong after such a renovation. So camshaft, ignition, something with valves ...

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
22 Sep 2017 21:23 #8074 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
I agree that there may have been a mistake made by the assembly when changing the block, it was 6 years ago and did by somebody, I drive this car with a faults since that time, but now I decided to adjust all properly.
after all tests passed, certainly we'll check a chain position, once it is checked, but we repeat it again.

but in general - did you agree, this modification is technically compatible or not at all ?

because engine is starting , run with power, but with some faults- bad mixture and failure on drive mode, if it would be a manual gear box, probably I would drive it with no problem .

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
23 Sep 2017 16:44 #8075 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
we have only 0.06 Bar at idle 750rpm, what can be wrong here.

thank you

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
24 Sep 2017 20:30 #8080 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Hi,

only 0,06 Bar in idle on manifold is nothing. Your manifold must have leaks like a swiss cheese.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
24 Sep 2017 22:09 #8087 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
what is best way to find leakage in manifold ?

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
25 Sep 2017 16:31 #8090 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Hi Tomas,

brake cleaner fluid is a way to test. And it should have been part of manifold assembly to verify if there are leaks. You spray on manifold, injectors, map sensor and verify whether that changes rpm. If it does, that is the place to check. After removing air filter, add some carton to air intake to build a chimney. Otherwise throttle will suck in brake cleaner and create wrong results.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
25 Sep 2017 18:39 #8094 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Hi Tomas,

I can hardly believe in 0,06 Bar vacuum in manifold at idle. Your car should not run with that amount of false air.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
26 Sep 2017 21:14 #8101 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
Hello Voler,

I just point out regarding engine swap, the exactly modifications was D Jedtronic mounted on engine M119.985 ( D jet manifold, ignition, fuel delivery line and etc was left from M116.982) . Does this kind of engine modification is technically compatible and can affect a possibility to adjust dJetronic properly ?

many thanks indeed
Tomas

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
26 Sep 2017 21:20 #8102 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
Hi,

I agree, we'll check vacuum level and leakage once again, because engine runs and starts easily , but runs rich and has fault on drive mode..

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
28 Sep 2017 19:27 #8108 von TomasLT
TomasLT antwortete auf das Thema: engine shut off on drive
Hello Volker,

measured vacuum is it correct ?

Anhang:

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

  • Volker
  • Volkers Avatar
  • Offline
  • Moderator
  • Moderator
  • Dr-DJet repariert und sammelt alles! :-)
Mehr
28 Sep 2017 23:39 #8109 von Volker
Volker antwortete auf das Thema: engine shut off on drive
Hi Tomas,

I am sorry, but there is nothing I can read from those photos. Buy a vaccum gauge 0 to -1 Bar and measure with that please.

Viele Schraubergrüße - best regards, Dr-DJet Volker

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Mehr
29 Sep 2017 07:00 #8110 von nordfisch
nordfisch antwortete auf das Thema: engine shut off on drive
Hi Tomas,
I can't read the scales, too.
It would help you would take and send better pictures with readable scales.

Regards
Norbert

Bitte Anmelden oder Registrieren um der Konversation beizutreten.

Ladezeit der Seite: 0.184 Sekunden
Powered by Kunena Forum