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      01-21-2013, 12:40 PM   #1
fs454
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Occasional very rough idle at startup followed by lack of power...fuel pump?

So lately I've been noticing my startup cranks have gotten a little bit longer. In preparation for my recent Boston to LA cross country trip, I told my dealer about it and took it in, citing that it really would not like to be caught somewhere in the middle of nowhere with a dying pump.

They didn't replace it, and I made it cross country with no issues. Now I've been here for a few weeks and yesterday morning when I started my car the idle shot to 2000 right away, then dropped really low below idle and started shaking for a few seconds before it caught itself again and returned to normal. As soon as I pulled out of my apartment complex and tried to accelerate, the car would barely gain speed no matter how much gas I was giving it. Nonetheless, I made it to my destination and 8 hours later when I started it up and drove home, all was normal again and the car had power.

I didn't have a check engine light or anything during this and still don't. Is it possible this is anything other than the fuel pump? My car's service records show that it had the HPFP replaced in mid 2010(not the latest pump?) It sucks having to wait until the thing grenades on me and ruins my day to get it fixed. Any advice? Also, if anyone's in the area, what's the best Los Angeles/Burbank area BMW dealer?


Thanks!
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      01-21-2013, 12:46 PM   #2
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Codes?
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      01-22-2013, 07:21 PM   #3
fs454
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No check engine light, but I plugged in my generic (but decent) code scanner and it brought up a bunch of seemingly bogus codes:

P0000
C0141
P3232
B2A50
B22AA
P22AA
another B2A50
B2AAA


None of these seem to mean anything at all, according to some quick googling, but they weren't there before. I've driven to work since the incident and took it on a hard drive up Mulholland with no issues, odd.
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      02-01-2013, 09:14 PM   #4
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My car does this every once in a while also, From what i have researched its either time to have the valves walnut blasted or the spark plugs need to be changed or a bad injector. I'm leaning to do the valves and plugs because i'm sure they need it and see if it fixes my problem.
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      05-09-2014, 10:11 AM   #5
TheRuss
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Did you ever get this resolved? Sounds very similar to my problem in that it revs too high upon startup, then drops too low. Did th r data log on my Cobb Accessport and apparently it's pulling the timing a lot at start up for some reason...
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      05-09-2014, 11:42 AM   #6
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Could be the gas. Start putting in quality gasoline for 3 -4 tanks.
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      05-09-2014, 12:06 PM   #7
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I already put in the best quality available. Shell's premium 99RON stuff. And I believe our fuel is better in the UK to start with anyway?
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      05-09-2014, 01:10 PM   #8
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I'm in the same boat you are except every morning my car will go into limp mode now. I've changed the plugs, coils, injectors, and hpfp sensor. Next is the walnut blast which I doubt is going to fix this issue.
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      05-09-2014, 02:58 PM   #9
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Nah, I've not changed coils or the HPFP sensor, but I have changed the plugs and had the walnut shell blasting done. Didn't help. My car doesn't go into limp mode, doesn't throw codes, or anything like that.

Concerned that it's pulling the timing so much though.

I just pulled my intake manifold pressure sensor though and it looked like this:


So I've given it a good clean. Not sure that it'll help though.
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      05-09-2014, 05:16 PM   #10
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^never heard of that thing? How do I access/clean it?
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      05-10-2014, 08:51 AM   #11
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It's actually pretty easy if you've ever taken the cowling at the back of the engine bay off (the plastic piece that the cabin filter is bolted to).

You can actually see the sensor if you open the bonnet and look behind the airbox. In fact, if you have aftermarket cone filters you can probably access it without removing the cowling.

It's screwed into the intake manifold just behind the airbox and can be seen without removing anything. I tried removing the lid of the airbox, but there just wasn't enough room to get my skinny hands in.

Now I've done it I know that I'd never have gotten it out with the cowling in place, because the wiring clip was tricky to release. If you have aftermarket cone intakes then it may be easier to release the clip though.

I just cleaned it (carefully) with isopropyl alcohol and some cotton buds. The round cage piece is just plastic and can be wiped down with the IPA and some shop towel, it's inside that cage that the sensor lives - two thin strips of metal that join at the end - you can see part of it in the second pic. You can just about touch these with cotton buds through the holes in the cage, but be careful not to damage them. You can also use switch cleaner or similar - as long as it doesn't leave a residue.
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      05-12-2014, 11:14 PM   #12
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Any change with the cleaned sensor Russ? Same issue on my end, and I'm starting to notice more threads popping up like this as our cars age.
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      05-13-2014, 03:08 AM   #13
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Nah, no difference. I was skeptical anyway, but I figured I might as well do it if it basically costs nothing. Better for that sensor to be clean I guess.

I ran a few more logs with my AccessPort last night and sent them to Cobb support, so hopefully they'll email me today with information on what the logs show and maybe some idea of what the problem might be.
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      05-13-2014, 03:42 AM   #14
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Post em up....let us have a look.
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      05-13-2014, 05:40 AM   #15
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I'm not at home at the moment. I've not even seen them myself TBH. I wouldn't really know what I'm looking at. Is there software to open the files on a Mac? I've really not looked into it at all, so was relying on Cobb to enterpret the data for me.
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      05-16-2014, 11:56 AM   #16
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Do you have wg rattle? Or a laggy throttle pedal?
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      07-03-2014, 09:41 AM   #17
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Wastegate rattles, but then they all seem to. Mine just seems to rattle on startup from warm. Don't think my throttle pedal is laggy though. Finally got a fault code on this and it's the HPFP.
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      07-03-2014, 03:09 PM   #18
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Wondering if you could be looking at a bad low pressure fuel sensor.
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      07-03-2014, 03:16 PM   #19
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Quote:
Originally Posted by TheRuss View Post

I just pulled my intake manifold pressure sensor though and it looked like this:

So I've given it a good clean. Not sure that it'll help though.
Is that a MAP or a MAF? Looks like a hotwire MAF sensor. A lot of those can not be cleaned.
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      07-03-2014, 04:29 PM   #20
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Quote:
Originally Posted by MightyMouseTech View Post
Is that a MAP or a MAF? Looks like a hotwire MAF sensor. A lot of those can not be cleaned.
Our cars don't have MAF sensors, it's a MAP sensor.
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      07-03-2014, 04:59 PM   #21
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Yeah, no MAF on these cars. Plus the sensor is just a bit of wire. If it can survive hot oil vapor then a little isopropyl alcohol isn't gonna hurt it.
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      07-03-2014, 05:00 PM   #22
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Quote:
Originally Posted by cheshirecat79 View Post
Wondering if you could be looking at a bad low pressure fuel sensor.
What makes you say that? The code was for the high pressure fuel system and the fault seems to match up with some HPFP symptom reports.
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