My e34 runs fine, then warms up and dies out

NYSpeed Automotive
1

I have a 92 525i, 2.5 m50 non vanos, 5 sp.

My e34 runs fine for a couple minutes, then starts running like shit and won’t move. Thought it may be a clogged cat so I pulled the exhaust off, it’s running open header right now. Put a scanner on it; no problems, even though once it starts running like shit it throws a cel. It said it’s getting 1.12v at the o2 sensor, but the o2 sensor isn’t on there.

I just dont understand because it runs perfect for the first few minutes. good steady idle, etc. I don’t understand what it could be? As soon as it starts warming up it dies out. When I put the scanner on it when it started running like shit after I started it and ran it for a couple minutes it was at 54 degrees celsius (~129F)

any ideas?

2

Sounds like your problem is going from open loop to closed loop with the O2 sensor. O2 sensors normally operate between 0 -1V.

3

[quote=“16vCorvette,post:2,topic:38907"”]

Sounds like your problem is going from open loop to closed loop with the O2 sensor. O2 sensors normally operate between 0 -1V.

[/quote]

[quote=“Coldaccord”"]

but the o2 sensor isn’t on there.

[/quote]

Sounds a bit more complicated than that

4

[quote=“Coldaccord”"]

I have a 92 525i, 2.5 m50 non vanos, 5 sp.

My e34 runs fine for a couple minutes, then starts running like shit and won’t move. Thought it may be a clogged cat so I pulled the exhaust off, it’s running open header right now. Put a scanner on it; no problems, even though once it starts running like shit it throws a cel. It said it’s getting 1.12v at the o2 sensor, but the o2 sensor isn’t on there.any ideas?

[/quote]

what is the actual text of the trouble code? That car has the 20-pin diagnostic socket, right?

5

coolant temperature sensor (there may be 2) check/replace the one with more pins
IAC maybe

6

theres only 1. it just sucks cause its in my buddy’s uncle’s garage, and whenever he’s there im working or at school, so i seriously never get the time to go over and try and diagnose it

7

plus since there’s only 1 cts, i would imagine the gauge reads off it as well. and the gauge is accurate. I had a scanner on it again today and the gauge was saying the same thing that the scanner was

it was throwing 2 codes now though;

201: o2 sensor control
37: o2 sensor heater relay circuit

8

sounds like your problem is you need more S38 in there.

9

lol. the only motor this car would see is an s5x. And it may never see that, if I get a different e34 first…