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  #1  
Old 06-22-2019, 04:44 PM
ArgentoCarNut ArgentoCarNut is offline
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Mein Auto: 05 M3, '13 TLC, '11X5 35i
Wierd “bog down” under hard acceleration

Hi folks,

Today I experienced a weird symptom that I had not felt before, and did not repeat itself, but I feel may be connected to another event.

E70 35i 120k miles 2011

Background: In the mornings, after sitting overnight in the garage, the car takes longer than usual to start. It requires a longer crank time than it did in the past. It only happens in the AM after not running for several hours.

I believe this started after some work I did recently (Replaced Coils, Plugs, Oil Cooler seals, Valve Cover with PCV). I did the work myself about 3/4 months at all.

What happened today: Attended an event and left car parked for 2 hours. After that, I started up and again crank time was longer than usual although engine was warm.

Idled for about 2 minutes before departing. Got in the road and almost immediately I saw a car coming at high speed behind. I first gave a bit more gas, then floored it to get all the performance out of the engine, and it felt a bit sluggish. Then at about 6k RPM it bogged down significantly and I lifted off the gas.

No CEL or any other symptoms. Did not happen again, even if I tried to replicate.

Wondering what can be causing this. Anyone with similar experience? Ideas of what to look for? I am inclined to look into the fuel system (filters & pumps) but have no idea where to start... I also wonder if some of the work I did left maybe a fuel line incorrectly tightened or something?

Ideas appreciated!


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  #2  
Old 06-23-2019, 09:28 AM
ard ard is offline
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Location: Sierra foothills, California USA
 
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Fuel delievery/fuel pressure issue?

I seem to recall that a cracked hose in the in tank pump assembly can result in fuel dumping back to the tank and not enough fuel at WOT. And can get worse over time.

Hope that helps, do a search see if there are others that resolve it and if it matches your symptoms....

Kinda WAG, but who knows....
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  #3  
Old 06-24-2019, 08:50 AM
ArgentoCarNut ArgentoCarNut is offline
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Location: Mid-South
 
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Mein Auto: 05 M3, '13 TLC, '11X5 35i
Update: This morning my wife felt a stutter when coming out of the garage and going uphill. Then again after stopping at the entrance of out subdivision. Got normal after that... still no CEL.

Will likely take it to the Indy shop later this week.


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Old 06-24-2019, 10:51 AM
edwardmagichand edwardmagichand is offline
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Mein Auto: '12 X5 35i, '08 135i Conv
Longer crank time was the symptom I had when my HPFP was not so good.
Also not enough power, and then finally stuttering with CEL.
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Old 06-24-2019, 11:44 AM
ard ard is offline
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Location: Sierra foothills, California USA
 
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Mein Auto: '12 X5 35d/E39M5/996TTX50
Might not make it to 'later this week'.... Hope it is minor
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Alignment here: The Definitive Alignment Thread

OE is Original Equipment aka 'BMW Original Parts' aka 'What you buy at the BMW dealer with a BMW label'

OEM is Original Equipment Manufacturer... EITHER the company that made the OE part or.... A part this is identical to the OE part, but is sold by the OEM under their own label


OEM is not what BMW sells


http://www.bimmerzone.com/category/T...ricks_OEM.html

https://www.turnermotorsport.com/t-OEvsOEM
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  #6  
Old 06-24-2019, 05:08 PM
ArgentoCarNut ArgentoCarNut is offline
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Location: Mid-South
 
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Mein Auto: 05 M3, '13 TLC, '11X5 35i
Quote:
Originally Posted by edwardmagichand View Post
Longer crank time was the symptom I had when my HPFP was not so good.
Also not enough power, and then finally stuttering with CEL.


Very likely diagnostic - I drove it a few minutes ago and more stuttering...

Thanks for the input.


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  #7  
Old 06-24-2019, 05:08 PM
ArgentoCarNut ArgentoCarNut is offline
What was that?
Location: Mid-South
 
Join Date: Feb 2016
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Mein Auto: 05 M3, '13 TLC, '11X5 35i
Wierd “bog down” under hard acceleration

Quote:
Originally Posted by ard View Post
Might not make it to 'later this week'.... Hope it is minor

Fingers crossed. Will work me in on wednesday.


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Last edited by ArgentoCarNut; 06-24-2019 at 05:20 PM.
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  #8  
Old 07-18-2019, 03:59 PM
ArgentoCarNut ArgentoCarNut is offline
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Update on this:
Many things got in the way, and my wife kept driving to the car until last week without any issues.

Family flew out on vacation on Monday, and I drove the car that day. I could feel what I could describe as a need for significantly more gas pedal input to get the same performance (at least from what I recall - I do not usually drive this car)

Heading back from the airport on the highway, I noticed once I was doing around 75 mph in Top Gear, I heard what I can describe as a backfire when I gave it significant gas pedal input (but without the gearbox kicking down a gear or two)

I drove it again today, and once again I felt the gas pedal input needed was much greater than expected to get the car going. Not only that, but I also had the engine die twice when on idle after starting up when I was leaving the office. It started back up and I was able to drive home.

My indy mechanic is on vacation until next week, but I have scheduled to drop it off with him next Monday.

I definitely suspect this is a fuel related issue.


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  #9  
Old 07-22-2019, 03:41 PM
ArgentoCarNut ArgentoCarNut is offline
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I dropped it off this morning and just got a call from the mechanic. He said it will need a new high-pressure fuel pump.

Does anyone here know how much I should pay labor for this? The part is about $500 from FCP Euro


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  #10  
Old 07-22-2019, 05:15 PM
ArgentoCarNut ArgentoCarNut is offline
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Mein Auto: 05 M3, '13 TLC, '11X5 35i
Forgot to ask: anyone here has DIY this? Difficulty level?


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  #11  
Old 07-29-2019, 05:35 AM
ArgentoCarNut ArgentoCarNut is offline
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Wrapping this up. The cost to replace was $280 and got it done in one day. Again running like a champ.

Only way I’d be happier would be if this hadn’t happened at all.

Cheers!


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  #12  
Old 07-29-2019, 06:09 AM
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Nyc Dito Nyc Dito is offline
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Glad it worked out, but no CEL or anything even after your initial post?
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  #13  
Old 07-29-2019, 06:38 AM
ArgentoCarNut ArgentoCarNut is offline
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Quote:
Originally Posted by Nyc Dito View Post
Glad it worked out, but no CEL or anything even after your initial post?


No CEL at all. The Indy was skeptical at first when I dropped it off, then he told me that there were codes stored in the ECU memory, but not enough to trigger a check engine light.


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  #14  
Old 07-29-2019, 07:04 AM
sf2000x5 sf2000x5 is offline
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Quote:
Originally Posted by ArgentoCarNut View Post
No CEL at all. The Indy was skeptical at first when I dropped it off, then he told me that there were codes stored in the ECU memory, but not enough to trigger a check engine light.


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I had a misfire and it turned out to be a failing ignition coil pack #2cyl. No CEL but the reader I have was able to find a stored code also.
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