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no coldstart 500 SL
- lucwaignein
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26 Nov 2022 21:05 #306714
no coldstart 500 SL wurde erstellt von lucwaignein
Hallo,
My car has a difficult cold start, about 5 sec. cranking. Then drives well.
I also think the ECU is failing (no kick down etc)
Today impossible to start, what can be the reason?
Thanks, Luc
1987 500 SL no lambda
My car has a difficult cold start, about 5 sec. cranking. Then drives well.
I also think the ECU is failing (no kick down etc)
Today impossible to start, what can be the reason?
Thanks, Luc
1987 500 SL no lambda
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26 Nov 2022 22:00 #306716
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Workshops 2023
K-Jetronic 6.5. HN, 20.5. ER, 24.6. FRA
Heizung/Klima 26.8. FRA
D-Jetronic 22.7. ER, 16.9. FRA
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Dr-DJet antwortete auf no coldstart 500 SL
Hi Luc,
please check 2 things:
please check 2 things:
- Fuel pressure when cranking on flange to cold start valve
- Voltage on cold start valve while cranking
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Workshops 2023
K-Jetronic 6.5. HN, 20.5. ER, 24.6. FRA
Heizung/Klima 26.8. FRA
D-Jetronic 22.7. ER, 16.9. FRA
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- lucwaignein
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27 Nov 2022 10:03 #306725
lucwaignein antwortete auf no coldstart 500 SL
Hi,
I checked voltage on cold start valve during cranking = OK
Also resistance on valve = OK (5 Ohm)
I can not check fuel pressure today.
(I can hear the fuel pumps running on ignition)
Thanks !
Luc
I checked voltage on cold start valve during cranking = OK
Also resistance on valve = OK (5 Ohm)
I can not check fuel pressure today.
(I can hear the fuel pumps running on ignition)
Thanks !
Luc
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27 Nov 2022 12:54 #306735
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Workshops 2023
K-Jetronic 6.5. HN, 20.5. ER, 24.6. FRA
Heizung/Klima 26.8. FRA
D-Jetronic 22.7. ER, 16.9. FRA
Dieses Bild ist für Gäste verborgen.
Dr-DJet antwortete auf no coldstart 500 SL
Hi Luc,
then I guess that you will see little or no fuel pressure. It might improve when you start ignition without starting engine several times before you finally crank it. If fuel pressure is bad, it can be
then I guess that you will see little or no fuel pressure. It might improve when you start ignition without starting engine several times before you finally crank it. If fuel pressure is bad, it can be
- Fuel accumulator
- Non-return valve on pump
- Leakage of fuel form fuel distributor to air flow sensor
- Leaking injectors
- Leaking cold start valve
- Leaking pressure regulator
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Workshops 2023
K-Jetronic 6.5. HN, 20.5. ER, 24.6. FRA
Heizung/Klima 26.8. FRA
D-Jetronic 22.7. ER, 16.9. FRA
Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.
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- lucwaignein
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03 Dez 2022 10:11 #307042
lucwaignein antwortete auf no coldstart 500 SL
Hello,
I checked the fuel pressures and is OK, 5.5 bar at cranking, and after cranking stays at 3 bar. Engine is flooded immediately, spark plugs are wet.
Ignition is OK, I have sparks.
So I think : bad injectors or leaking cold start valve?
I checked the fuel pressures and is OK, 5.5 bar at cranking, and after cranking stays at 3 bar. Engine is flooded immediately, spark plugs are wet.
Ignition is OK, I have sparks.
So I think : bad injectors or leaking cold start valve?
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03 Dez 2022 10:19 - 03 Dez 2022 10:33 #307043
Alles könnte einfach sein, ist es aber nicht
R107 SL 380 (US) Bj 83, 930U silberblaumetallic
Gruss Andreas
ZitroniX antwortete auf no coldstart 500 SL
Good morning
change your plugs to Sparkplugs made by NGK
BOSCH plugs are made often in Russia and have problems
change your plugs to Sparkplugs made by NGK
BOSCH plugs are made often in Russia and have problems
Alles könnte einfach sein, ist es aber nicht
R107 SL 380 (US) Bj 83, 930U silberblaumetallic
Gruss Andreas
Letzte Änderung: 03 Dez 2022 10:33 von ZitroniX.
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03 Dez 2022 16:18 #307058
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Workshops 2023
K-Jetronic 6.5. HN, 20.5. ER, 24.6. FRA
Heizung/Klima 26.8. FRA
D-Jetronic 22.7. ER, 16.9. FRA
Dieses Bild ist für Gäste verborgen.
Dr-DJet antwortete auf no coldstart 500 SL
Hi,
good hint from Andreas. If you have Bosch swap to NGK BP6ES.
If you have proper system pressure and holding pressure, points 1 and 2 are okay. Now open flap on air-flow sensor (after removing air filter) and light under fuel distributor. Is it wet there? Then remove thin hose on pressure regulator. Dry or fuel drops? If all that does fit, check injectors and cold start valve.
good hint from Andreas. If you have Bosch swap to NGK BP6ES.
If you have proper system pressure and holding pressure, points 1 and 2 are okay. Now open flap on air-flow sensor (after removing air filter) and light under fuel distributor. Is it wet there? Then remove thin hose on pressure regulator. Dry or fuel drops? If all that does fit, check injectors and cold start valve.
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Workshops 2023
K-Jetronic 6.5. HN, 20.5. ER, 24.6. FRA
Heizung/Klima 26.8. FRA
D-Jetronic 22.7. ER, 16.9. FRA
Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.
Bitte Anmelden oder Registrieren um der Konversation beizutreten.
- lucwaignein
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11 Feb 2023 11:52 #310592
lucwaignein antwortete auf no coldstart 500 SL
Hello,
I have changed injectors, now cold and warm start are OK so I suppose there was some fuel leaking from the injectors. The cold start injector is not leaking, but I am not very confident. Is it a good idea
to disconnect the csv electrically are better to disconnect the fuel line completely?
The only issu that is left is the high %CO (5 %) When I adjust it to 2 or 3% engine becomes "unruhig"
I also checked for vacuum leakes with the brake cleaner method, no leaks.
Car drives very nice otherwise.
Thanks!
Luc
I have changed injectors, now cold and warm start are OK so I suppose there was some fuel leaking from the injectors. The cold start injector is not leaking, but I am not very confident. Is it a good idea
to disconnect the csv electrically are better to disconnect the fuel line completely?
The only issu that is left is the high %CO (5 %) When I adjust it to 2 or 3% engine becomes "unruhig"
I also checked for vacuum leakes with the brake cleaner method, no leaks.
Car drives very nice otherwise.
Thanks!
Luc
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