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

Misfire at low tank level

Discuss problems you have had or are having with your Z4
Post Reply
Youdey
Newbie
Newbie
Posts: 43
Joined: Sun Aug 08, 2021 7:46 pm
Location: Cardiff

Misfire at low tank level

Post by Youdey » Sat Sep 17, 2022 4:30 pm

I don't have any warning lights on but this code has popped up along with misfire from cylinder 4. It popped up about 150 miles ago but as there was no light that came up I only noticed it today when checking on Carly. I've got access to live data using Carly but I'm not sure what tests I need to run. I also have some of the data stored from the incident:
Misfire at low tank level
Counter recognition bad road: 0.00 -
Engine speed: 736.00 1/min
engine temperature: 61.50 C
Fuel tank level: 7.00 l
Misfiring cylinder 4
Maximum relative load at misfires: 32.03%
Maximum speed with misfires: 1024.00 1/min
Minimum relative load at misfires: 18.36
Torque current value: 32.00 Nm
I have recently replaced the spark plugs & I swapped around the coils as I had misfires earlier in the year so I know it is not either.
Carly says it's a serious issue yet no warning light has come up, should I be fine to continue driving it?
2003 BMW Z4 3.0i Sterling Gray

User avatar
Chippie
Senior Member
Senior Member
Posts: 2311
Joined: Tue Apr 30, 2019 9:11 pm
Location: Wakefield

Misfire at low tank level

Post by Chippie » Sat Sep 17, 2022 6:27 pm

Did you replace all the coils?
E89 35is space grey Kansas coral red leather

Youdey
Newbie
Newbie
Posts: 43
Joined: Sun Aug 08, 2021 7:46 pm
Location: Cardiff

Misfire at low tank level

Post by Youdey » Sun Sep 18, 2022 3:01 pm

Chippie wrote: Sat Sep 17, 2022 6:27 pm Did you replace all the coils?
No the coils have only been swapped to see if they were the issue when it was misfiring earlier in the year which they weren't
2003 BMW Z4 3.0i Sterling Gray

User avatar
enuff_zed
Lifer
Lifer
Posts: 14383
Joined: Wed Oct 26, 2016 11:05 am
Location: Attleborough, Norfolk

Misfire at low tank level

Post by enuff_zed » Sun Sep 18, 2022 3:09 pm

Perhaps I'm missing something, but to clarify, it's telling you that it had an issue a while back with very low fuel level, and now you have a misfire in No4?
If that's so, then have you considered that running the tank so low has picked up debris from the bottom of the tank which is no affecting No4 injector?
HQ of 'Norfolk Zed Rescue'.
Always happy to help if I can.

If the forum helped you, why not help the forum back. Thats the Z4 way! :thumbsup:
Image

User avatar
colb
Senior Member
Senior Member
Posts: 1623
Joined: Wed Nov 13, 2019 9:45 pm
Location: Newport, South Wales UK

Misfire at low tank level

Post by colb » Sun Sep 18, 2022 4:32 pm

Swap the coil from 4 to 1 and clear the codes then run and see if the code returns and note which cylinder has the misfire. If it remains on 4 then as enuff_zed said suspect a blocked injector thats maybe leaking fuel into the cylinder and causing a misfire. If the misfire moves to No1 then coil has the issue.
Z Shed Cymru member
1999 1.8 Z3
2003 2.5 Z4
1998 Honda Deauville 650
If the forum helped you, why not help the forum back. Thats the Z4 way! :thumbsup:
https://www.paypal.com/cgi-bin/webscr?c ... source=url

Post Reply