Changed the thermostat, now it wont idle

Post Sat Oct 22, 2005 5:36 pm

(318i 1990 M40 engine)
Tried to change the thermostat last week because it was running to cold all the time, but I got an air lock and in frustration i put the old one back in, then i got some good advice on how to sort the air lock on this forum, which i then did.

So today i changed the old thermostat again, and put in a new one with what i learned last week, and this time no air lock and no overheating problems.

BUT now it wont idle and just dies when you get to a junction etc, what could i have done to get this problem?????

Post Sat Oct 22, 2005 6:07 pm

Mine didnt used to idle. I cleaned out the throttle body as it was dirty, and also the ICV. (at the back of the bay behind the manifold). Hope this helps, but im not sure that this would be related to the heating.

Paul

Post Sat Oct 22, 2005 6:08 pm

Mine is an M40 as well.

Post Sun Oct 23, 2005 12:10 am

Hope this helps, but im not sure that this would be related to the heating.

Paul[/quote]

The heating problem is solved, the idle problem is new and unconected to the thermostat.

Post Sun Oct 23, 2005 12:34 am

Could just be coincidence mate. As said above I'd try cleaning ICV and TB and see if that helps.

Taylor.

Post Thu Oct 27, 2005 10:55 am

Taylor325i wrote:Could just be coincidence mate. As said above I'd try cleaning ICV and TB and see if that helps.

Taylor.

ive had a few days to run the car now and it starts ok (hot or cold)
but it wont idle at all when cold, but when warmed up and coming to a stop the red dash lights flash for a second as the revs drop down and then stablises at 650-750 rpm.

so is it
1. ICV
2.TB
3. BLUE COOLANT SENSOR

i dont wont to make things worse by distubing the wrong bits.