Rough idle/poor running

[Bristol_Jer]

I've been having problems getting my m30 converted e30 to run properly. The idle used to be hunting badly, but have replaced a few hoses that were split and it has settled down.

Now the car will start up, and idle where it should but sounds really spluttery and rough, almost like a missfire. When you rev the engine from idle it struggles to pick the revs up and splutters, sometimes with a little pop in the exhaust, but when the revs are up and you blip the throttle again, it will rev perfectly. It does get a bit better once the engine has properly warmed up but it still isn't great. When driving the car it feels pretty good, though I haven't driven it far as no tax/MOT on there.

There isn't smoke from the exhaust, and the exhaust fumes smell normal, not like it is overfuelling.

Parts that I have changed recently are plugs, cap and rotor arm, crank sensor, blue temp sensor, fuel filter, cleaned and tested ICV. Compression test perfect

I haven't tested the TPS yet, could this be at fault? Another idea I have is to refurb the injectors, would this help? Also would the wrong plugs cause running issues like these? I wasn't sure they were 100% the right ones, but I was assured they were.

Engine is a standard 1990 e34 535i engine

Any ideas appreciated please!

[Grrrmachine]

You replaced the blue temp sensor, but did you test the wiring to make sure the signal is getting to the ECU?

[Bristol_Jer]

No I haven't, thanks for the suggestion I will check that

[Bristol_Jer]

Any other things I can check on the car, or does the fault definitely sound like the blue sensor wiring? Thanks

[Rav335uk]

What BLue temp sensor did you use, M30 or M20?????

[Bristol_Jer]

M30, got it new from BMW

[Rav335uk]

NO!!!!!!!!!!!!!!!

You need the M20 one.

Read the m30 section

[Bristol_Jer]

Oh f*ck!!!!!!!!

So that could be the cause of all my running issues????

[Rav335uk]

My mistake, it's the brown sensor that needs to be M20

[Bristol_Jer]

I just checked too, thank fook for that! I have put a M20 brown sensor in. You nearly gave me a heart attack Rav!

[Rav335uk]

Rough idle, check the AFM and idle valve too.

[Bristol_Jer]

ICV is checked and cleaned out, I'll check the AFM too as I'm not sure if I've checked that yet.