Z3 runs rough on start up................

chocolatedog

Regular Member
Joined
May 18, 2012
Messages
14
Hi again all,
Firstly thanks to all for the advice regarding my central remote locking,now a new question.........lol!
ive noticed on a morning (car stood overnight) when i start the car it runs rough
(is if only on 3 cylinders) but no smoke etc,after maybe 30sec it settles down and
ticks over fine,pulls fine when setting off etc, starting after this is ok........this only really happens after an
over night stand.
Temp sensor maybe?
Any help would be great,thanks in advance.....
Mike ;)
 

HornelZ3M

Zorg Addict
Supporter
East Anglian Crew
Joined
Dec 4, 2011
Messages
939
Location
Raglan. South Wales
Model of Z
Z3M Roadster
Depending which engine it is probably oxygen sensors i think there are 2 so would change both ;) you could also try
cam sensors as they cause this problem as well.
 

chocolatedog

Regular Member
Joined
May 18, 2012
Messages
14
Just had a look under the car and can only find 1x oxygen sensor (in the front pipe before the cat) but
all the drawings ive seen mention 2x , one before and one after the cat .................??????????
Was this normal on the 1998 1.9 car?
Helpppppppppppppp. :-s
Mike
 

GazHyde

Administrator
Staff member
Administrator
Global Moderator
British Zeds
Joined
Dec 2, 2011
Messages
15,654
Location
Newbury, Berkshire
Model of Z
Audi TT Mk3
I'm not sure if you have heard of RealOEM.com or not, but it allows you to find all the parts for your BMW. You can also use it to break down the parts for your particular car.

If you enter your car details or last 7 digits of your VIN number, then look for the Exhaust System from the list you should be able to locate the sensors from that.

http://realoem.com/bmw/select.do
 

Hammers

Dedicated Member
The M44 Massive
Joined
Dec 31, 2011
Messages
63
Hi I have the same thing let me know how you get on mate :coolsteer)
 

GazHyde

Administrator
Staff member
Administrator
Global Moderator
British Zeds
Joined
Dec 2, 2011
Messages
15,654
Location
Newbury, Berkshire
Model of Z
Audi TT Mk3
If my Realoem skills are correct, this should show you both 1.9 engine exhaust systems.

1998 1.9 M43 engine Parts 5 & 6


1998 1.9 M44 engine Parts 8 & 9
 

bonbon

Zorg Addict
Joined
Mar 13, 2012
Messages
69
Location
Israel
Model of Z
19L Auto
I'm looking forward to the answer too.
I sometimes have the same behavior.
Not 100% sure - but I think that if I turn the switch half way before letting it turn over the engine is does not happen. I need to be focused in the next few mornings...... :-?
 

Brian H

Zorg Expert (I)
Supporter
British Zeds
Scottish Zeds
Joined
Dec 5, 2011
Messages
3,654
Location
Killin
Model of Z
E36/7 3.0i - E85 Z4///M
Hi Mike,

As Hornel states above the camshaft sensors are a well know failure point which causes lumpy idle, they are relatively easy and cheap to change over but before you do that have you had a code reader on your car to see if there are any error codes? This can sometimes point you in the right direction.

My last car a 1.9 '98 M44 had the same symptoms as you describe but would sometimes also take a little longer to start once warm.

Cheers
 

chocolatedog

Regular Member
Joined
May 18, 2012
Messages
14
Well guys my exhaust has only 1x oxygen sensor before the cat,if you take a look at the drawing it shows 2x,i downloaded
the data and registered it against my VIN number,on doing this i could only obtain the part number for the front sensor and
no number was available for the rear,guess all is correct with my car having only 1x sensor otherwise 2x part numbers should have
been seen (the rear sensor would have a longer cable thus different part number)
Any way, i crawled under the car last night and disscontected the sensor plug and cleaned the connections,this morning when i started
the car it fired up perfectly and idled correctly.............................................................ive changed the sensor for a Bosch
part just in case it was a fluke..............................will report back if it has cured the problem 100%. Fringers crossed..... ;)
Mike
 

Hammers

Dedicated Member
The M44 Massive
Joined
Dec 31, 2011
Messages
63
Hi mike are you talking about a lamber sensor and where did you get yours from mate thanks Steve :coolsteer)
 

chocolatedog

Regular Member
Joined
May 18, 2012
Messages
14
Hi again,
Spoke too soon...................................changed the oxygen sensor (Bosch part from EURO CAR PARTS) and thought all was
well as the car started fine the next morning >.....................................>but the morning after - HMM - back to square one!
I tried the trick BONBON mentioned as in "turn ignition on - wait a few seconds - starts spot on!!!!!! tried this the last 3x mornings
and its been great every time. If this trick continues to work - "that will do me" i can live with a 3 second wait! Any ideas
on this one????????? ECU ckecks prior to start up??
Cheers.
Mike (enjoying the hood down in the sun!) :)
 

Monkey

Regular Member
Joined
Mar 6, 2012
Messages
72
when you say turn it on, before starting. is it 1 click, or 2 clicks you leave it on?

it could be fuel pump going a bit weak/slow on startup.

how's your oil level?
 

bonbon

Zorg Addict
Joined
Mar 13, 2012
Messages
69
Location
Israel
Model of Z
19L Auto
It's more like getting the ECU to sort itself out - before asking it to think or do something. :-?
 
Top