E30 M52

[KaiserRolls]

For your health

[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.

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[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