Twin turbo difficult to start

eng622 · Post by **eng622** » Mon Sep 11, 2023 2:39 pm

Posted about this a few weeks ago and had one response suggesting a fuel issue. It seemed to be how I started it and the start button. Some times I had to release the brake pedal to get it to start. The fault went away after pressing the start button more firmly and was fine for a few weeks starting instantly. But on a recent long journey needed to accelerate up a hill and the yellow half engine light came on, the engine was very lumpy for a few miles but then ok but with much less power. On return started ok but light came on again after some miles but was able to cruise on the motorway at 70 mph.
Next day back to difficult starting taking several seconds of cranking and needing to release the brake pedal. Engine very lumpy and poor idle for a few seconds and then the small yellow engine light came and on driving away the larger half engine light came on as well. But now it is difficult to start when hot which has never happened in the past. The small light wont go off but the half light does.
Thinking I have an intermittent fault that may now be permanent. Ordered an OBD scanner any clues on what might have failed.

Chippie · Post by **Chippie** » Mon Sep 11, 2023 2:43 pm

I think it’s all guess work until you have scanned it and have some fault codes

B21 · Post by **B21** » Mon Sep 11, 2023 11:27 pm

Need fault code reader..my guess failing / failed fuel injectors…maybe HPFP maybe LPFP..but injectors my bet..

Did I say fault code reader ?

eng622 · Post by **eng622** » Mon Sep 18, 2023 5:07 pm

Bought a scanner and get two codes. Both P3049. First ends $07e8, second $07e8Pd.
Still difficult to start, only seems to want to start on releasing the start button.

matsmith749 · Post by **matsmith749** » Mon Sep 18, 2023 6:04 pm

Lol.

The code reader is doing you no favors - let me guess, £5 job from ebay?

Close to useless.

eng622 · Post by **eng622** » Mon Sep 18, 2023 9:06 pm

Bought a Foseal FO-01 wired one, are you saying these are no good. Had good reviews.

B21 · Post by **B21** » Mon Sep 18, 2023 10:54 pm

eng622 wrote: ↑Mon Sep 18, 2023 9:06 pm Bought a Foseal FO-01 wired one, are you saying these are no good. Had good reviews.

Yup it’s crap…

You need a decent code reader that supports BMW extended code support..a rudimentary thing like that is almost worse than useless…

Even with a decent BMW code reader it’s not as easy as you would wish for..

Tough love required some times…

eng622 · Post by **eng622** » Tue Sep 19, 2023 10:56 am

What scanner will work or should I take it to a mechanic who can do it

raymond.harper · Post by **raymond.harper** » Tue Sep 19, 2023 11:05 am

Many of the members advise a Creator 310+ You can get one from Amazon for around £63 and return it if things do not work out.

enuff_zed · Post by **enuff_zed** » Tue Sep 19, 2023 11:22 am

Or state where you are and see if anyone nearby can help.

eng622 · Post by **eng622** » Tue Sep 19, 2023 2:36 pm

Found a list of codes and P3049 gives activation starter relay open circuit. Is this relevant to difficult starting.
Also there was a safety recall about installing repair cable for positive battery terminal line, which I never had done but now booked in.
Could this be part of the problem. As said only wants to start on releasing the starter button suggesting to me it may be a power problem.

eng622 · Post by **eng622** » Tue Sep 19, 2023 10:29 pm

I'm in Beeston west of Nottingham if anyone can help

matsmith749 · Post by **matsmith749** » Wed Sep 20, 2023 12:31 am

The problem is p3049 is a generic code being returned by the basic code reader - it's not going to pinpoint the issue for you. If anything it will lead you down the path of wasted money & misinformation. Return it if you can, and get the fiver back.

You really do need to spend the £60 or so on a code reader that can give the BMW specific codes - that really narrows down the problem.

Nobody here (or anywhere else on the tinternet) can help other than make good guesses without that information.

£60 is cheaper than a single garage visit - money well spent.

eng622 · Post by **eng622** » Wed Sep 20, 2023 10:31 am

OK did not realise the cost of getting a mechanic to do it. The reader does say it is a manufacturers code not a generic one.

matsmith749 · Post by **matsmith749** » Wed Sep 20, 2023 11:12 am

The answer you need is as above - a code reader that is up to the job. Examples of such are in this thread, without one you are up the creek without a paddle.

Most garages charge £100 (or something in that region) for diagnostics - you might get lucky & it cost less wherever you live.

If you own this e89, you are going to want that good code reader several times - it's considered a 'must have', especially if you want to try to fix things for yourself rather than rely on BMW.

That's another thought - BMW garage will sort this out for you, but expect to pay a few hundred for the privelige of them even telling you what is wrong.

Z4-forum.com

Z4-forum.com