High pressure fuel pump!

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Sarah lou
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High pressure fuel pump!

Post by Sarah lou »

Hi boys ....and girls .....

Please help me as I’m not sure if I’m being taken advantage of ...

Summary>

Drive a BMW 114i 1 series - 2014 - petrol

. Got a drive train error come up 4 weeks ago could not drive car
.errors were
1) misfire cylinder 3 (140310)
2) misfire cylinder 3 injection shut down

Went to a garage and had all 4 coil packs changed (£230)

.drove away car was fine

.next morning on motor way accelerated hard to go from 60-70 and the car juddered until I eased off the accelerator, this happens all the time now when I accelerate hard but if I ease my speed up there is no judder at all
.went to start car this morning and it struggled
.went to leave work this evening and pulled away with not enough acceleration and car went dead and drive train mode came back up
.turned car off and pressed button again and reved it to 3000 and car was ok and message went off dash and car didn’t stall again , even start / stop at lights was ok

.took to a garage and it threw out code
.11A002 - fuel high pressure, plausibility pressure too low
.took to garage and got a call back saying HIGH PRESSURE FUEL PUMP IS gone £550

I have no clue if this is right or not .... please help me .....

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marco_polo
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Re: High pressure fuel pump!

Post by marco_polo »

It's plausible.

Could also be the fuel rail pressure sensor itself giving screwy readings? Or damage to the wiring loom whilst they were changing the coil packs?

Impossible to diagnose accurately over the internet.
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Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

Thanks for the reply. I just dunno what to do, they’ve had the car for 3 days and he’s not sure that is what the issue is he’s just saying that’s where we should start .... well £600 is a big start 😩😔

330d uk
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Re: High pressure fuel pump!

Post by 330d uk »

The 114i and 116i fuel system is run by a fairly cheap problematic fuel pump relay which causes all sorts of fuelling problems, a few people have tried a new relay with success here:

viewtopic.php?f=3&t=117375
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Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

Hey Iv asked the mechanic about the relay and he’s saying that if it were the relay the high pressure fuel pump wouldn’t have any power at all but it does but just low pressure??

simmers1978
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Re: High pressure fuel pump!

Post by simmers1978 »

Hi, did you manage to get this fixed? I have the same issue with my 116i, changed high pressure fuel pump, injectors, pressure sensor, fuel pump relay, Checked wiring, I’ve run out of ideas.
Cheers

Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

God don’t say that!!!! I’m only just changing the high pressure fuel pump this weekend !!!

simmers1978
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Re: High pressure fuel pump!

Post by simmers1978 »

Sarah lou wrote:
Tue Jan 14, 2020 5:31 pm
God don’t say that!!!! I’m only just changing the high pressure fuel pump this weekend !!!
If I were you, I would hold fire, I’ve seen other forums where people haves changed low pressure and high pressure pumps, relays, sensors and it hasn’t fixed it, have you got BMW looking at this?

Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

I can’t afford for bmw to look at it !!! Iv took it to 2 different garages both have said HPFP .... did u take yours bmw

simmers1978
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Re: High pressure fuel pump!

Post by simmers1978 »

Sarah lou wrote:
Wed Jan 15, 2020 11:32 am
I can’t afford for bmw to look at it !!! Iv took it to 2 different garages both have said HPFP .... did u take yours bmw
No, I used to work with them a few years back, but I’m not paying them £135 p/h+vat to tell me what I already know, I’ve posted a video of the issue I’m having, I have put a brand new HPFP on my car and it hasn’t made any difference, spoke to a bmw tuning company, told him my symptoms and he thinks it could be the DME(engine Ecu) which I was thinking before I had spoken to him.
Does your car do this?

Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

Yes it does, but when I’m driving I can’t accelerate hard in high gears or the whole car will just judder and then lose power and drive train comes up! The biggest problem is it not starting in between short journeys so if I go to work for 8 hours the car will start up fine, if I go to work for 2 hours it won’t start at all it will turn over but just keep dropping out and coming up drive train then all of a sudden it will just start - rough but as though nothing has happened

Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

Yeh so HPFP changed ..... car starts a bit better definitely less lumpy, still judders when I accelerate heavy so no change there .... it’s a bit quieter than it was and is driving a bit more smooth ... the gear box and steering wheel ain’t shaking to s**t! Iv just pulled up now so il try to start it again in 2 hours and let’s see if it starts but I’m guessing it won’t Cos the guys couldn’t even get it started after they fitted it, he took all the pipes that attach to the low pressure fuel pump out to make sure there was fuel running through or something like that put it back together and then it started .... so basically NO I DONT THINK THERE WAS ANYTHING WRONG WITH MY HPFP after all..... what now??? What’s your next move????

Sarah lou
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Re: High pressure fuel pump!

Post by Sarah lou »

Also had a new relay today so it’s not that either .... it idling a lot WORST than before now feels like it’s going to cut out but doesn’t actually where as before it would of cut out

simmers1978
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Re: High pressure fuel pump!

Post by simmers1978 »

Sarah lou wrote:
Sat Jan 18, 2020 5:52 pm
Also had a new relay today so it’s not that either .... it idling a lot WORST than before now feels like it’s going to cut out but doesn’t actually where as before it would of cut out
Have they put a fuel pressure tester just before the hpfp to check that you’re getting between 5-6 bar of constant pressure from the low pressure fuel pump?
My next move is to speak to an ECU repair specialist regarding the signal to the hpfp relief valve, it sounds like it’s operating it too quickly not allowing the pressure to build up in the fuel rail, that’s my expert opinion.
I’ll keep you posted.

simmers1978
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Re: High pressure fuel pump!

Post by simmers1978 »

This video here demonstrates how to test low pressure and hpfp, it’s a Mini Cooper S, which has a near identical engine to ours, the hpfp design is slightly different, but works in the same way.

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