E30 M52

[B C]

Chapter 15: The wild goose chase

Cliff’s Notes: was running on 4 cylinders, determined 1 coil is bad and 1 injector was stuck. Injector un-stuck and now running on 5 cylinders until i get a new coil

Kaiser is a good guy. He sent his ECU for me to try out. After plugging it in I expected to fire it up and hear all 6 cylinders running. But it still ran on 4.

The last piece of the puzzle should be the injectors.

The misfire was on cyl 2 and 3 so i moved those injectors to 1 and 4 and sure enough the misfire followed.

I felt a bit ripped off since back in july when i bought the engine they were working fine and i had sent them off to be cleaned and tested by a reputable injector shop.

I pulled the bad injectors out as well as 1 known good one for reference I checked the resistance. All were good at approximately 14 ohms.

So i connected the injectors to a 12v power supply (jumper box) and checked for solenoid clicking.

The good injector clicked, one of the “bad” injectors did not. I kept applying voltage and it suddenly started clicking. All 6 injectors were now clicking when manually applying power to them. So I put the injectors back in and expected to fire it up and hear all 6 cylinders.

Nope.

BUT WE UPGRADED TO RUNNING ON 5 CYLINDERS

So i checked the remaining “bad” injector. Hmm it isnt bad at all. It ends up being a bad coilpack even though I bought all 6 brand new, Bremi brand (OEM). Moving it to other cylinders as well as a resistance test confirmed it was bad. It measures 40 ohms on the outer 2 pins when a good coil should be

Now in hindsight it can see that the 2 dead cylinders were from 1 stuck injector and 1 bad coil instead of 2 bad injectors as originally thought.

I just need to replace the coil and I should be in business

5 out of 6 aint bad

[YoungCR]

I've heard bremi coil packs can be duds from the factory, glad it's getting sorted out.

[B C]

Good to know its not just me. I dont have a lot of faith in the remaining 5 as a result

[Jdesign]

Snap said:

Good to know its not just me. I dont have a lot of faith in the remaining 5 as a result

I spent more time than most humans should researching brands and coil information. I hope the new coilpack has you running smoothly.

[B C]

Much better!

All is now well in the world once again

Gunmetalgrey sent some old coils with the parts I purchased from him and swapped out the one I tested that was bad

[YoungCR]

Woot WOot!

[Jeff]

Nice! But where is the burnout video???

[Jdesign]

This^^^ Glad to see its alive and well!

[GunMetalGrey]

Purrs like a kitten! 
Glad it's firing on all cylinders!

[B C]

Passenger side control arm is in, driveshaft is in with new hardware and new CSB, heat shields are in, car is on all fours

[stealthbimmer]

Burnout video

Sent from my SM-G930R4 using Tapatalk

[B C]

No brake master cylinder [emoji16]

I did order one today though.

[stealthbimmer]

Cinder blocks in front of the front wheels.

Sent from my SM-G930R4 using Tapatalk

[Jeff]

[Jdesign]

All I see is excuses....

[B C]

Thanks to stealthbimmer for the covers. There is some cosmoline action going on so I need to track down something to clean it up with.

[GunMetalGrey]

Mmmmm. Tidy.
Throw the rest of the M3/318 wiring covers on and you've got a tasty looking bay sir!

[m42b32]

That looks great!!

[Earl]

Still in awe that there are 24 valves under that hood

[B C]

GunMetalGrey said:

Mmmmm. Tidy.

Throw the rest of the M3/318 wiring covers on and you've got a tasty looking bay sir! 

Yep, still figuring out how it all needs to be trimmed.

For sure the diagnostic connector hole and the clearance for the manifold, but the uncertainty lies mostly with the main harness connector