Need S50 help. Car runs but poorly

[Den_k321]

as i already told you about your noise : when your timing belt is loose it will cause some drivability issues usually under high load or high rpm. If your timing belt is not properly tensioned it will not keep the valves timed properly to the lower end and this will cause misfires, loss of power, bucking, and could even cause a no start condition.

change that tensioner and timing belt since your gonna be there.

[Silvertip]

Running cold could be caused by thermostat stuck open.

[Munich Man]

It has pretty new plugs on it. Any other ideas for the idle or tach? I'll check the gauge later. Thanks man!

[Matt-B]

I had an alum rad, and other stuff, never moved past 1/4, id replace the gauge in cluster, did you change anything maint. related ? your crappy Idle could be something as simple as spark plugs

[Munich Man]

Well, the main issue (Cutting power while driving) is fixed! Fricken engine to chassis ground.. Anyways, now instead of flopping around my temp sensor moves correctly, but stops right below the quarter way mark. Any ideas? Also still idles a tiny bit rough. Need some advice. Idles low (500-600) and makes random crunching noises.

[Matt-B]

Shoot, might have cam and crank backwards. Not sure how it'd run. Won't hurt to check

Also check fuel rail ground

[Munich Man]

This. That would be my guess if it worked before.

It didn't work before, but perhaps I've had it backwards from the start? I'll swap them when I get home and post back later. Thanks guys!

[e30austin]

No, you might have switched around the harness plugs and have the temp sender for cluster plugged into the ECU sensor

This. That would be my guess if it worked before.

[Matt-B]

No, you might have switched around the harness plugs and have the temp sender for cluster plugged into the ECU sensor

[Munich Man]

Reversed what? The sensors are in correctly. It's a bad ground that I still haven't fixed that's causing the issue for the temp sender. The idle problem is still there, as well as power cutting. Can anyone come look? I will pay!

[e30austin]

Sounds like you reversed them.

[Munich Man]

Ecu temp sensor perhaps?

I changed both of the sensors, and now the temp gauge on the cluster flaps around like crazy. Haha, it looks funny.

[Wanganstyle]

Have you pulled the check engine codes?

The bmw computer is designed to tell you when something is fucked up.

If your check engine light doesn't work it would the first problem to solve.

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[Matt-B]

Ecu temp sensor perhaps?

[Munich Man]

Put a new TPS in a couple weeks ago. Drove on a full tank and it still cut out. It runs fine when it's cold though. After it warms up it gets sloppy. MAF didn't really do much. Couldn't really tell but if anything probably ran worse.