Long crank after mhd st 2+

Tzaks

Specialist
May 30, 2019
53
18
0
Ride
35i e89
Hello,

I have upgraded my DP, intercooler, chargepipe, coils and plugs and everything is running fine however, on a cold start or if I leave the car sitting for lets say 2 hours, it will take a few seconds until it starts. It cranks for about 2-5 seconds and then it starts.

I read on other online forums that this indicates an issue with the HPFP. I'm a bit puzzled because when I was looking at the logs it seems to be reaching 2.6-2.7k PSI. So I'm not sure if it is the HPFP or not.

Also checked for codes and there's nothing obvious, I have a few:
e717
e71a
e71b
e720
But I think these are triggered by the MHD flash. Please correct me if I'm wrong.

My car is an e89 35i from 2010.

Here are the logs:

I'm not an expert on analysing logs so if anyone could tell me if they see anything wrong in the logs that would be great and I'd really appreciate it.
 

Tzaks

Specialist
May 30, 2019
53
18
0
Ride
35i e89
I can see 09 at the end, does this mean they are rev 9? I attached a picture.
 

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NoQuarter

Major
Nov 24, 2017
1,662
1,066
0
Indiana, USA
Ride
Z4 35is, 535xi, X5 35i
Yes - index 9 are old injectors that could stand to be replaced if you are having related symptoms.

Long cranks after a shutoff for a couple hours or overnight could be due to leaking injectors dripping too much fuel into the cylinder causing it to take a few cranks to clear out before it starts properly.

See what other opinions there are....
 
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Tzaks

Specialist
May 30, 2019
53
18
0
Ride
35i e89
Yes - index 9 are old injectors that could stand to be replaced if you are having related symptoms.

Long cranks after a shutoff for a couple hours or overnight could be due to leaking injectors dripping too much fuel into the cylinder causing it to take a few cranks to clear out before it starts properly.

See what other opinions there are....

Thank you for your input. I'll wait to see what other people are thinking too. If it's worth mentioning, this wasn't happening on the stock map. Do you know if this longer start would damage the engine?
 

NoQuarter

Major
Nov 24, 2017
1,662
1,066
0
Indiana, USA
Ride
Z4 35is, 535xi, X5 35i
Thank you for your input. I'll wait to see what other people are thinking too. If it's worth mentioning, this wasn't happening on the stock map. Do you know if this longer start would damage the engine?

It won't hurt the engine.

You can revert back to the stock map to see if the symptoms go away
 

NoQuarter

Major
Nov 24, 2017
1,662
1,066
0
Indiana, USA
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Z4 35is, 535xi, X5 35i
I think the first step would be to test the battery guys

Ha... So true. Battery is always the first suspect in these cars. Even when it doesn't seem remotely plausible.... Check the battery!

My X5 cranked strong but would not start.
Had it towed. Charged battery and started fine!

Paid for the tow and the diagnostic just to get my battery charged!
 
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Tzaks

Specialist
May 30, 2019
53
18
0
Ride
35i e89
I think the first step would be to test the battery guys

Thank you. I'll check the battery, at first glance it seems fine but who knows. It might be on it's way out. The things I was thinking about were:
Battery
Starter motor
HPFP
Maybe spark plugs indexing - if fuel injectors would drip on the tips perhaps indexing the plugs would help as the iridium tip wouldn't get as wet when protected by the metal "umbrella".
 

NoQuarter

Major
Nov 24, 2017
1,662
1,066
0
Indiana, USA
Ride
Z4 35is, 535xi, X5 35i
Thank you. I'll check the battery, at first glance it seems fine but who knows. It might be on it's way out. The things I was thinking about were:
Battery
Starter motor
HPFP
Maybe spark plugs indexing - if fuel injectors would drip on the tips perhaps indexing the plugs would help as the iridium tip wouldn't get as wet when protected by the metal "umbrella".

No way the fuel can drip on the tips of the plugs.

Charge the battery - test the results

If that doesn't do it then work on the injectors
 

matreyia

Major
Apr 19, 2017
1,780
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335i e93
Heh... I bet money that you did not replace your HP fuel sensor and LP fuel sensor... hehehe....and also possibly you have a bad battery..or bad negative battery terminal (there is a processor that comes with the terminal)
 

Tzaks

Specialist
May 30, 2019
53
18
0
Ride
35i e89
Heh... I bet money that you did not replace your HP fuel sensor and LP fuel sensor... hehehe....and also possibly you have a bad battery..or bad negative battery terminal (there is a processor that comes with the terminal)

Thank you for the suggestions, how can I test and tell if the sensors you mentioned are defective? I seem to get normal readings from them and I don't see any codes that relate to them.
 

matreyia

Major
Apr 19, 2017
1,780
711
0
Ride
335i e93
Thank you for the suggestions, how can I test and tell if the sensors you mentioned are defective? I seem to get normal readings from them and I don't see any codes that relate to them.

You cannot tell when they go bad. They just do. Buy from fcp euro.so you don't have to pay for them over and over.

Your symptoms point to sensor/battery & possibilities and not pumps.