Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.

Poorly 35i (Now Fixed)(sort of)

Post Reply
User avatar
mr wilks
Legend
Legend
Posts: 21894
Joined: Wed Jul 04, 2012 10:02 pm
Location: Lancashire

Poorly 35i

Post by mr wilks » Fri Sep 15, 2017 7:02 pm

:(
Last edited by mr wilks on Fri Sep 15, 2017 10:32 pm, edited 1 time in total.
3 ZMRs
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo

User avatar
dario
Senior Member
Senior Member
Posts: 1382
Joined: Fri Jul 13, 2007 3:33 pm
Contact:

Poorly 35i

Post by dario » Fri Sep 15, 2017 7:34 pm

Do you see evidence of any black smoke when the car is running rough?

Has it got worse as it's got colder?

How long does this condition last?

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Fri Sep 15, 2017 7:44 pm

It's about the same as when it first played up some weeks back. It's hesitant and intermittently misfires for the first mile then starts to smooth out and is normal when warm.

I have warranty so whatever comes the max cost will be the excess.

It's just getting it to be faulty enough to show codes or risk the dealer going 'seems fine to us' because there aren't codes.

It's just had a full service including plugs so it's not those (provided they really did change them).
Last edited by Maniac on Fri Sep 15, 2017 7:48 pm, edited 1 time in total.

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Fri Sep 15, 2017 7:45 pm

And no, no smoke of any kind.

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Sat Sep 16, 2017 12:41 pm

So to help my in my diagnosis can someone with a 35i/s start their car, let the revs settle to around 600r at idle as normal and then try and hold the throttle at 1000 or 1500 rpm (no higher).

I can only stabilise revs at 2000rpm or higher. Lower than that results in the idle bouncing up and down if I try to hold idle around 1000 rpm.

This will help me understand if the rev bounce is normal at light throttle when stationary or if it's a symptom of whatever is wrong.

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Sat Sep 16, 2017 12:54 pm

Here is what I mean. For some reason I've also acquired a nice loud whine this morning from the engine, I'll consider that coincidence for now as it could be belts with it being stood a while.

So in this video I press the throttle a tiny amount and hold it there with my foot wedged against the footwell wall. I can't keep the revs stable until they're well over 2000rpm and I've no point of reference to indicate if this is right or wrong.

It just sounds and feels wrong.

https://youtu.be/SJsdVjejGjg


Z4M-2006
Lifer
Lifer
Posts: 7020
Joined: Fri Jun 29, 2012 7:53 am
Location: High Peak,Derbyshire.

Poorly 35i

Post by Z4M-2006 » Sat Sep 16, 2017 1:42 pm

Chances are that its going to be an injector.

I would get it in for diag check as a smooth running test can be done and this can determine which injector is faulty... On the N54 batches of 3 injectors should be swapped due to indexing.

What happens is the injector starts to drip fuel onto the top of the piston,effectively flooding the cylinder until it can be got rid of through combustion.

What you DONT want to happen is the injector to stick fully open and fill the cylinder,upon start this hydraulics the piston and will bend the rod. Sounds drastic but it does happen,and it aint rare..


I wouldnt wait....

User avatar
dario
Senior Member
Senior Member
Posts: 1382
Joined: Fri Jul 13, 2007 3:33 pm
Contact:

Poorly 35i

Post by dario » Sat Sep 16, 2017 3:37 pm

Maniac wrote: Sat Sep 16, 2017 12:54 pm Here is what I mean. For some reason I've also acquired a nice loud whine this morning from the engine, I'll consider that coincidence for now as it could be belts with it being stood a while.

So in this video I press the throttle a tiny amount and hold it there with my foot wedged against the footwell wall. I can't keep the revs stable until they're well over 2000rpm and I've no point of reference to indicate if this is right or wrong.

It just sounds and feels wrong.

https://youtu.be/SJsdVjejGjg

Just uploading now!

User avatar
dario
Senior Member
Senior Member
Posts: 1382
Joined: Fri Jul 13, 2007 3:33 pm
Contact:

Poorly 35i

Post by dario » Sat Sep 16, 2017 3:40 pm

dario wrote: Sat Sep 16, 2017 3:37 pm
Maniac wrote: Sat Sep 16, 2017 12:54 pm Here is what I mean. For some reason I've also acquired a nice loud whine this morning from the engine, I'll consider that coincidence for now as it could be belts with it being stood a while.

So in this video I press the throttle a tiny amount and hold it there with my foot wedged against the footwell wall. I can't keep the revs stable until they're well over 2000rpm and I've no point of reference to indicate if this is right or wrong.

It just sounds and feels wrong.

https://youtu.be/SJsdVjejGjg

Just uploading now!


here is mine (35i)



Sorry about the de-mister

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Sat Sep 16, 2017 3:57 pm

Thanks for that. So I saw a little bounce in revs when you held it at 1000 but it seemed to settle. Mine doesn't, it continues to bounce up and down despite holding the pedal at a fixed position.

Looks like this is an easy way to point at a fault.

User avatar
dario
Senior Member
Senior Member
Posts: 1382
Joined: Fri Jul 13, 2007 3:33 pm
Contact:

Poorly 35i

Post by dario » Sat Sep 16, 2017 4:08 pm

Maniac wrote: Sat Sep 16, 2017 3:57 pm Thanks for that. So I saw a little bounce in revs when you held it at 1000 but it seemed to settle. Mine doesn't, it continues to bounce up and down despite holding the pedal at a fixed position.

Looks like this is an easy way to point at a fault.
Have you got any damage to any air hoses (vacuum system) this was a typical symptom in my past of cars with air leaks on the inlet manifold.

one way of finding a leak is to use brake cleaner (be careful) if the engine speed increases in an area when sprayed than its sucking in to the manifold at that point.

just a thought.

User avatar
dario
Senior Member
Senior Member
Posts: 1382
Joined: Fri Jul 13, 2007 3:33 pm
Contact:

Poorly 35i

Post by dario » Sat Sep 16, 2017 4:16 pm

Hi Manic,

on a different point what code reader are you using and is it any good.

I need to clear my airbag light on my 5 series GT F07 and the dealers want £30 with is a good price IMHO, but i'd like to put this toward a reader/ fault clearing device as with my Z4 and F07 and my daughter cars, adding another £40-50 might be a better idea as then i'll be able to read and clear faults on all cars (i think)

cheers

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Sat Sep 16, 2017 4:26 pm

Nothing im aware of. It's only an issue when cold.

It's warmed up now and revs can be held at 1000 with ease.

When cold I get that bounce as per my video.

I guess as has been suggested I'm going to have to take it in and take a chance they can find it easily.

User avatar
dario
Senior Member
Senior Member
Posts: 1382
Joined: Fri Jul 13, 2007 3:33 pm
Contact:

Poorly 35i

Post by dario » Sat Sep 16, 2017 4:50 pm

Maniac wrote: Sat Sep 16, 2017 4:26 pm Nothing im aware of. It's only an issue when cold.

It's warmed up now and revs can be held at 1000 with ease.

When cold I get that bounce as per my video.

I guess as has been suggested I'm going to have to take it in and take a chance they can find it easily.
Any answer to my code reader question?

Maniac
Lifer
Lifer
Posts: 8202
Joined: Tue Oct 26, 2010 2:52 pm

Poorly 35i

Post by Maniac » Sat Sep 16, 2017 4:51 pm

I borrowed a friends adaptor from work and it found nothing.

Post Reply