I bought a mini off a friend that had blown valves.

Error codes:

009C90 - IHKA Integrated Automatic heating and A/C system control unit fault -- WHAT IS THIS? I could find no info online on what its related to.
002EE2 - combustion misfiring several cylinders damaging exhaust gas
002EE6 - cylinder 1 misfire
002EE9 - cylinder 2 misfire
002EFE - combustion misfire several cylinders detected
002EFF - cylinder 1 misfire
002F00 - cylinder 2 misfire

I did a bunch of work to the car:

New Valves
New turbo
new injectors
new bosch plat plugs
new coils
new thermostat housing
new water pump
new timing chain

the car runs great except at startup its a bit rough but minimally. after that she runs great. I checked the temp with my scanner and im getting a temp reading that seems normal. If I mixed the plugs on the tstat housing would i still get a temp reading? I think they were keyed differently anyhow so if i recall they couldnt be mixed up. i cleared the adaptations to see if they would resolve it but it did not,

I did a smoke test and found no leaks.

But now im trying to figure out the last issue and not sure where else to look. if anyone has any ideas. im last guess is regular unleaded gas was put into the car, would that cause this sort of issue?

thanks for the help

 

Did you double check the engine's mechanical timing?

 

hmm i guess timing might be a bit off ill take a look. i used the tensioner when torqueing all the bolts.

not sure if that caused an issue or if i needed to use the pre tensioner tool

 

From what I can tell, fully torquing the timing chain tensioner bolt prior to torquing the VANOS units to spec is not an uncommon practice to ensure that chain is tight at this last key step of the timing chain installation.

 

Tell us more about the cylinder head work. Were the valve seats replaced?

N12 series engine valve seats are only .22" and .23" deep. They tend to fall out especially after the machinist has touched them with a tool to restore the surface finish and proper angles.

Here's a picture of the OEM valve seat (middle) compared to the deeper SBI seats. The problem is finding a machine shop with a small enough cutter.



When your engine is misfiring, disconnect the intake camshaft sensor. Does the misfiring stop? If it does, you have loose or dropped valve seats.

Here's another picture of the typical N series engine dropped valve seats. Exhaust and intake valve seats both tend to drop. Notice the intake valve seat that has fallen out; it's cracked. In some cases, the seat will come completely apart and get munched between the piston and the cylinder head causing lots of damage to the piston, cylinder wall, and cylinder head.



More dropped seats on another MINI I fixed.

 

Would dropped valve seats only produce misfires at cold start up and then no misfires thereafter? That's the OP's problem.

 

It's an N18 motor and all I did was lap the valves when installing replacements

The rings and pistons were good.

The misfires are for a short time and I can barely tell they are happening. A few studders and it goes smooth.

Maybe the timing is slightly off. Do the vanos units need to be installed in a direct direction? I know IN goes to intake and EX goes to exhaust. I used a timing kit to lock everything when torqueing. The only last thing that maybe can also cause an issue is the throttle body. I forgot to check that. Would a throttle body cause misfires?
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I was trying to look into this some more. Im getting 1000 psi on the rail at idle. is that normal? Its a new HPFP from the dealer.

Could the injectors be messed thats making the pump give more fuel? I am leaning towards faulty new injectors.

I checked the timing and its spot on, its not off.

 

Check the fuel trims.