Coolant temp sensor is bad. It's what tells the ECU if the engine is cold or at normal running temperature. If the sensor goes bad it defaults to feeding fuel as if the engine is fully warmed up, so until it gets warmed up, it's running too lean.

 

I'd kiss you !!!!! Thanks I'm on eBay already !! I'll let you guys know if that will fix it

 

Nope, no choke. The computer goes into what is called "open loop mode". It injects extra fuel to warm up rather than choke the air flow. Temperature sending unit or a bad thermostat will cause this.

 

Temp sending unit?! The coolant sensor you mean ?!! I blocked that throttle loop ! Ima
Go Tuesday and buy the coolant sensor ! What else ?! Thanks !

 

I haven't had time to dig into my 325i. I wasn't sure if there was a sender or a sensor. They do the same thing but in different ways. I should have scrolled down to see HornHospitals post. He already had it.

 

Chokes are things that only exist on carbureted motors. you have EFI.
+1 for the temp sensor.

What version of motronic do you have? if you have a 153DME, I'd suggest an upgrade to a 173 DME.

 

If you have the 6 cyl, it's right on top. takes minutes to change.

 

Bleed the coolant after.

 

I can't find where to fit the purple one !

 

I've unplugged my ECU after changing the 1sensor ! And the car seems to run better and nimbler !!

 

You unplugged WHAT? The engine will not run with the ECU unplugged. Not no way, not no how.

 

Sorry ! What I mean I reseted by unpluged it for a few minutes put it back started the car .. Ran fine ! I let it run ! Then shut it off and back on, she was still acting up .. But it's a different feeling .. Used to run like somebody clogged the intake and exhaust .. Now it sounds better and runs .. I mean really runs, it spins tires everywhere

 

give it a week. if a sensor is off itll come back

 

I'll swap that pesky purple sensor with the correct one tomorrow in the am and update ! I hope tomorrow she'll run fine

 

I swapped the sensor too changed the idle valves between them I have 3 .. Times the throttle position sensor .. Which was pesky, I had to grind those ears to give it a longer slack .. It wouldn't work other way.. Unplugged the ECU and fired it up.. It runs at normal idle it's starts right but I'm afraid I need a lambda sensor .. I've read somewhere about a wideband one?!! That's would be the last thing I haven't changed ! The car runs way better then before it has power and the smell of unburned gas went away.. The mixture is def better !!

 

Nice one. What makes you think you need a new O2 sensor?

 

you can't feed the car a wideband sensor unless it was built for one. I'd suggest OEM/equivalent for the narrowband O2 sensor. if you WANT a wideband (for the gauge), then something like the Innovate LC-2 can output a narrowband sensor so you can feed it back to the engine.

 

At different idles 650 thru 900 let's say or when I'm at 760-800 idling at a stop light for more then a few secs my check engine light comes on and goes off once I tap shortly on the gas or when I shift in 1st.. So I'm still getting more fuel.. I smell the car running a bit rich .. But not even close to how was running before! I'm gonna change my AFM with the old one and give it one last shot .. Tuesday im buying a new O2 and post again ..

 

At different idles 650 thru 900 let's say or when I'm at 760-800 idling at a stop light for more then a few secs my check engine light comes on and goes off once I tap shortly on the gas or when I shift in 1st.. So I'm still getting more fuel.. I smell the car running a bit rich .. But not even close to how was running before! I'm gonna change my AFM with the old one and give it one last shot .. Tuesday im buying a new O2 and post again ..

My e30 started doing that - I replaced the O2 sensor and it stopped doing that.

 

Cool thanks ! Where you got yours .. Ebay Stealership ?!?

 

Bavauto. they also sell an O2 sensor wrench with a cut-out so you don't ruin the wires.

 

I'm waiting on the tool should be here these days .. I'm curious if that will solve my problems

 

The tool is in .. I'm waiting on a sunny day to be able to Change the lambda sensor ! Haven't changed one yet, I hope it won't give me any headache!

 

wouldnt hurt to have a propane torch near by.