Engine miss firing and rough idle

[DTNJNQ]

I was stopped at an intersection today. Took off and noticed that the engine started to run rough and vibrate. The engine was miss firing like it was running on less than six cylinders.
The car almost stalled when I stopped at the next intersection. I traveled for about another .5 Km and pulled over when it was safe. I shut the engine down and restarted it. After restarting the car was idling and running fine. Happened again when I was close to home. Shut the engine down again and re -started and it was fine again.
It now appears to be fine. There were not service lights or faults on the idrive.

Anyone had a similar problem?
Should I take it into BMW to have it looked at it? Might be a waste of time unless they can replicate it.

[Taymaishu]

Originally Posted by DTNJNQ

I was stopped at an intersection today. Took off and noticed that the engine started to run rough and vibrate. The engine was miss firing like it was running on less than six cylinders.
The car almost stalled when I stopped at the next intersection. I traveled for about another .5 Km and pulled over when it was safe. I shut the engine down and restarted it. After restarting the car was idling and running fine. Happened again when I was close to home. Shut the engine down again and re -started and it was fine again.
It now appears to be fine. There were not service lights or faults on the idrive.

Anyone had a similar problem?
Should I take it into BMW to have it looked at it? Might be a waste of time unless they can replicate it.

Definitely take it in. If it was misfiring, it would have thrown a code and they'll be able to sort it out easily under warranty.

[IZAGLO]

it's the start of Mr HPFP and his buddies My Spark Plug and Mr Injector telling you to take the car to BMW....it will only get worse before it gets better...just like in life you gotta fell the pain before the joy!!

[banglemangle]

Earlier this year, I had this issue precisely as you described. Note the car only drank 98 ron from bp / shell high vol sites.

Within about 20 or so engine hours (maybe less, I can't remember) the car was undrivable. At first, "re-setting" the OBC fixed it for a few minutes, then the whole blowing clouds of smoke, running on 2 or 3 cyl, long cranks, stalling, etc started.

[BMWRX]

It seems like you're yet another one struck down by the bane of a 135i owner's existence; the HPFP failure. Let me guess, it'll misfire when you're giving it a little bit of curry? The dealership will all but deny that it's a common problem ("oh really, you say you've heard of it before on quite a few cars? Well, we've only had one other car come in with a similar problem"). It should take about a day or two to get replaced and hopefully all will be rectified.

[DTNJNQ]

It happened again a few times this morning. The car is now with the service department at Melbourne BMW. I mentioned to the service manager that it might be HPFP as I have also been noticing long cranks at start up. They told me they would have a good look at it and sohould have it ready by this afternoon.

[DTNJNQ]

Got a call this afternoon from the service manager. They advised the problem is the HPFP and are going to replace it. They will need the car overnight.

[BBK]

I've never misfired or had lumpy idle. But for about 3-4 weeks now I have had longer cranks on cold start ups. Never when it is warm. Seemingly began when the temp was getting colder at night though...

[banglemangle]

Originally Posted by BBK

I've never misfired or had lumpy idle. But for about 3-4 weeks now I have had longer cranks on cold start ups. Never when it is warm. Seemingly began when the temp was getting colder at night though...

And the car?

:-)

[555]

Originally Posted by DTNJNQ

Got a call this afternoon from the service manager. They advised the problem is the HPFP and are going to replace it. They will need the car overnight.

It will also pay to get the injectors replaced too - push for them to look into that.

I've had my fuel pump and injectors replaced ~3 weeks off the road.

[DTNJNQ]

Got the car back today. HPFP has been replaced and car now feels fine. The first one lasted 25000km. Hope this one lasts a lot longer.

[Taymaishu]

Originally Posted by DTNJNQ

Got the car back today. HPFP has been replaced and car now feels fine. The first one lasted 25000km. Hope this one lasts a lot longer.

I know they replaced the HPFP with a new model, new part number. I'm pretty sure you would have got one of the new ones?

Glad to hear she's back on the road and going well

[DTNJNQ]

The code on the service docket for the new HPFP is BM13517504943.

[BBK]

Spoke too soon... engine light came on last night, no power, dropped cylinders... Turned car off and back on and was all sweet again.

[BMWRX]

Originally Posted by BBK

Spoke too soon... engine light came on last night, no power, dropped cylinders... Turned car off and back on and was all sweet again.

Same thing happened with me. They said they had replaced it but it took going in a second time before I think it actually was replaced. I believe they only did a software update the first time.

Speaking of service dockets, I never received any paperwork when my pump was replaced. Very strange.........

[DTNJNQ]

Originally Posted by BBK

Spoke too soon... engine light came on last night, no power, dropped cylinders... Turned car off and back on and was all sweet again.

Similar to what I had except for the engine light.

[Cozy]

Thanks for posting this, I had exactly the same problem yesterday. I've also had about 8wks of long cranks, first started being long at cold start but now is extending to warm start too.

Yesterday I turned on the car when it was warm, took a while to crank but idled ok. I drove up to the end of the road, stop sign and the car started misfiring and sounded like it was missing some cylinders, it also did this when I revved it and drove it to make sure it wasn't and idle only issue. I pulled over around the corner, switched it off and back on, all was fine and all the way through the 40mile trip.

My car is in for HPFP replacement tomorrow, I reported it when it was long-cranking but this just seems like another side effect so I'm glad to be getting this done. I think if I left this any longer then it'd just die totally and I couldn't run the car but it's taken this long to get BMW to admit the fault.

By the way, no error codes ever.

[softy180]

My car is suffering long crank times when cold, I took it in and they said HPFP was the issue, BMW advised that they would cover part of the repair as the car is out of warranty but I'm pushing them to cover the whole thing. Well see what they come back to me with.

[harpoon]

I too have just started to get this.

Car went into limp mode yesterday under relatively normal driving, been having some very rough starts/idles in the morning.

Of course the car is out of warranty now. Softy180, are you in Sydney? If so which dealer are you using? I'd be happy with the cover of at least something even if only the parts.

[softy180]

In Melbourne, if it's HPFP push them hard and don't back down. I'm still waiting for a response to see if they will cover the lot

[Cozy]

Just to clarify that I had mine done last week and it has been great since. Fires up on the button, no misfiring, seems to cruise more smoothly and doesn't judder on idle. This pump can cause so many problems!

I only use my car on a weekend and it got worse pretty rapidly with low mileage, I wouldn't want to run a daily driver too long with this, I think It'll give out pretty quickly.

[harpoon]

My car went in for diagnosis today.

They just called to tell me it's definitely the hpfp (as expected) and that BMW Aust will cover the cost of everything - parts and labour. Was very impressed with this as I never even had to ask. My car ran out of warranty a year ago.