This M54 thinks it's a diesel ?

GT456! · Post by **GT456!** » Wed Jun 17, 2026 6:26 pm

Hey Thanx!
I think I know where I stand now!
See pic.

GT456! · Post by **GT456!** » Wed Jun 17, 2026 6:32 pm

Thanx a lot!
Greatly appreciated to you guys your responses are on point! I think I know where I stand now!
See pic.

X5Sport · Post by **X5Sport** » Wed Jun 17, 2026 9:47 pm

Combustion gas in the coolant? I assume the green is the contaminated and blue is what it should be if no CO2 present?

GT456! · Post by **GT456!** » Wed Jun 17, 2026 10:22 pm

Accurate

Leslie · Post by **Leslie** » Thu Jun 18, 2026 9:51 pm

200k is fairly decent for that engine or indeed most engines , few get much further these days

It sounded very rough in your little video so I didn't think it would end well.

GT456! · Post by **GT456!** » Fri Jun 19, 2026 1:59 am

You know I got a snicking suspension the engine was patched up when I bought it.
I've had that car maybe 8 years!
It had 199k on the clock. Cost me about 900 bucks.

GT456! · Post by **GT456!** » Sat Jun 20, 2026 12:58 pm

Great info...a keeper!
There was exhaust fumes in the radiator

GT456! · Post by **GT456!** » Thu Jul 16, 2026 1:30 pm

Just as a chaser oil 10w30 Walmart brand.
Left the oil filter cap off.
Now I'm rewarded with cleaning up!

X5Sport · Post by **X5Sport** » Thu Jul 16, 2026 2:36 pm

Oops! Makes a mess don’t it.

GT456! · Post by **GT456!** » Wed Jul 22, 2026 10:44 pm

Well ordered the ancel bm5000 this scanner has the relearning capabilities for the bmw throttle body.
Resulting in a smooth engine idel and responsive gas pedal... should receive it in couple of days fingers crossed

GT456! · Post by **GT456!** » Mon Aug 03, 2026 11:16 am

The horrible rough idel I'm experiencing all due to a dead unresponsive throttle body.
For this model year I must use oem!
I'm told that the ecu is highly sensitive and will accept vdo only!
Anyone here have this experience...Thanks!

Leslie · Post by **Leslie** » Mon Aug 03, 2026 3:07 pm

I don't know about the petrol models but a cheap throttle body I bought for my x5 35d didn't work correctly , the car ran ok but wouldn't regen the dpf.I had to buy an oe pierburg in the end .

GT456! · Post by **GT456!** » Wed Aug 05, 2026 6:35 pm

De installed a tb from the x5 today in the boneyard. Needs cleaning for sure 3.0 engine $75...car cranks but idel surges still!

X5Sport · Post by **X5Sport** » Wed Aug 05, 2026 6:54 pm

Does your engine have an egr? There’s a valve that prevents rough or surging idle that should move the egr idle control valve. If you disconnect it, does the idle smooth out? I think it forces the ecu to change to a default map and will throw a code (which clears when reconnected.

Could be an egr leak, bad MAF, bad ICV or air leaks. Ignition timing is ecu controlled.

I suspect you’re going to need a tool that can read the engine’s live parameters to see what’s upsetting the ecu. If you have an old laptop available, it is possible to get hold INPA/ISTA on auction sites. There are threads on here going back some years about setting it up - it needs old versions of Windows unless there’s a newer version available. Several folks have done it on here and may be able to help.

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