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Solved ✔ Engine hard to start when is hot
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11-02-2022, 07:16 AM,
(This post was last modified: 11-02-2022, 09:18 AM by masa52.)
Post: #1
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Engine hard to start when is hot
Hi
The problem is that when the car is hot wont start as it should Has to crank about 2-3 seconds When is cold start perfect Car is BMW 840d with b57 engine 15K mileage I’m run out of ideas what can cause that problem!!! All tests are perfect All adaptations and corrections reset Software updated Rail with sensor and valve changed Coolant sensor changed Camshaft sensor changed Intake sensors checked Throttle changed Air mass checked Fuel filter changed Fuel temp and pressure sensor checked Injectors perfect Fuel pressure perfect No idea maybe someone has had similar issue |
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11-02-2022, 08:14 AM,
Post: #2
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RE: Engine hard to start when is hot
Crankshaft sensor was changed with what?
Used, new, oem? |
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11-02-2022, 09:13 AM,
(This post was last modified: 11-02-2022, 09:19 AM by masa52.)
Post: #3
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RE: Engine hard to start when is hot
I did not change crankshaft as its shit access to it
I changed camshaft sensor sorry my mistake |
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11-02-2022, 09:33 AM,
Post: #4
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RE: Engine hard to start when is hot
So much part waste and you haven't changed the main sensor responsible for fluent start? Have you at least checked in live data you get correct starter rpms immediately after starting crank?
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11-02-2022, 09:58 AM,
Post: #5
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RE: Engine hard to start when is hot
Then change crankshaft sensor, use only OEM, brand new
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11-02-2022, 12:58 PM,
Post: #6
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RE: Engine hard to start when is hot
As said all live data are perfect
Rpm fine after start Car drives perfectly apart hot starting Im pretty sure its some silly problem but its hard to find as all data is correct I know it’s stupid idea to replace parts but its no any other way to find the issue |
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11-02-2022, 13:00 PM,
Post: #7
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RE: Engine hard to start when is hot
You should look at rpm live data WITHIN those 2-3 secs when car is not starting as you would expect. Of course there are no problems after if car runs.
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11-02-2022, 13:06 PM,
Post: #8
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RE: Engine hard to start when is hot
And fuel pressure is ok, when STARTING? not when engine runs.
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11-02-2022, 13:19 PM,
(This post was last modified: 11-02-2022, 14:09 PM by masa52.)
Post: #9
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RE: Engine hard to start when is hot
Fuel pressure looks fine but what I noticed its when is hot pump too reach nominal value need more time. I will upload bit later video. Maybe this is the case.
Attached videos If you have any other suggestion what to test I can do this thanks for help |