Cold start misfire

Hi and thanks for using 2CarPros.

This is a tough one for me because the 318 isn't offered in the US, so my technical information is limited.

However, I have a couple suggestions. First, switch the coil packs with different cylinders to see if the misfire changes. If it doesn't, then check and confirm fuel pressure is within the manufacturer's specs as well as check for engine vacuum leaks.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If both are good, then I need you to get a live data scanner and determine of the engine coolant temperature (ECT) sensor is functioning correctly. The ECT tells the computer the temperature of the engine coolant. If, for example, it tells the computer the temp is -20 degrees F and in reality it is 80 degrees F, the computer will change the fuel mixture so the engine can run under the extreme cold which would allow too much fuel to enter the engine under the actual conditions.

Let me know if any of this helps or if you have other questions.

Take care and I wish you a Happy New Year.

Joe

Hi and welcome back:

It could be an issue with fuel pressure, an injector, or even the engine coolant temperature sensor, vacuum leak. You could check for an injector leak issue by testing fuel pressure drop off.

An intake gasket that leaks will allow too much air enter the combustion chamber, so yes. That could be the issue. I attached a link above that shows how to check for a leak.

Let me know what you find.

Joe

Hi and welcome back:

The idea that it is working in a closed loop is normal at start up. I noticed that the O2 sensors are incomplete. Basically, that means the codes have been cleared and the system has not completed a drive cycle (driven far enough) to reset that portion of the emissions readiness.

If you can, send me pictures of the STFT (short term fuel trims) and LTFT from the scanner. I may have a better idea of a vacuum leak with that. Also, you could still have a vacuum leak regardless. I'm not sure why you have no heat. It could be a plugged heater core or even a blend air door issue. If the blend air door isn't working and IF it is actuated by engine vacuum, that may be both the vacuum leak and the heater problem.

I feel really bad that I don't have a manual to look through for this vehicle. Let me know if any of this helps. Also, sometimes, you are able to hear a hissing sound when there is a vacuum leak. With the engine running, listen under the dash and around the heater control unit for a hissing. Also, do the same under the hood.

Joe

Where you hear a ticking, could it be a gasket leak?

That's hard for me to answer not being there. I have heard vacuum leaks sound like a tick. Follow the link I first listed related to vacuum. It shows how to test if it is a leak. If you can record and upload the audio as well as a picture of the affected area, it would be helpful. Without the technical information I normally have, I need to see exactly what you are dealing with. I have no reference.