[E30] Start cold Engine - warm

[janzbedny]

Hi,
I have frustrating problem with my E30, and i don't know which part of Engine can be guilty.
My car:
E30 Coupe, M10B18 316i, LU-Jetronic injection, 1988/04.

When i try start my car in "special" conditions, engine difficult start up:

Engine cold, The heat outside - Hard start up,
Engine cold, cold outside - excellent start,
Engine warm, The heat outside - great start,
Engine warm, cold outside, great start.

I have no idea, what can be solution :/
Do you have any ideas?

Engine also unevenly work in idle rpm.

Sorry for my bad English :/
Regards!

[MR E30 325is]

Have you looked into your coolant temp sensor?? I'd probably replace the one for the ECU and the Dash if you can.

I had a similar issue on my E30, and that ended up getting the culprit.

[janzbedny]

Have you looked into your coolant temp sensor?? I'd probably replace the one for the ECU and the Dash if you can.

I had a similar issue on my E30, and that ended up getting the culprit.

Thanks for fast reply! ;D;D

M10B18 have three sensor in one place:
http://www.realoem.com/bmw/en/showpa...81#13621274630
Number: 4, 6, 8
Which i need check? And How? I heard that i need measure resistance

I think, that culprit may be number 4 in scheme (13621362599)

[e30davie]

With starting issues (regardless of temperature) as well as uneven idle it points me to vacuum leaks. I'd be checking for vac leaks before swapping out any parts. You can also check the resistance values of your coolant sensors before swapping them out, the spec will be in a manual somewhere.

[janzbedny]

Thanks for fast reply! :)

Today I was looking for wires which are tired of life :D
I found two disturbing wires.
Tomorrow i go buy two Fuel Hose in BMW shop, because my wires are cracked.

https://zapodaj.net/37c3a88f03951.png.html

I need two number 14 in scheme http://www.realoem.com/bmw/en/showpa...diagId=13_0269

If this will not help i try check Thermo-Time Switch, and Cold Start Valve.

Thanks my friend for help! :)

[janzbedny]

Today i found large clearance in STARTER VALVE (13641285087)
Is it admissible in that place?

https://youtu.be/WNjWeuynsy4

In practice it is larger than that of the movie

[janzbedny]

I change this two fuel wires, and my BMW start perfect in all weather conditions! :)
But still, if engine is warm/cold unevenly work in idle rpm, jump 50rpm down/up.