S54 Limp Mode

[JerryE21]

Hey everyone, first post here! Ive recently completed a s54 swap into my e46 sedan. The car drove great for a little while and is now plagued by the EML light and limp mode.

When this first occurred I began investigating and noticed that the actuator arm had actually came off. So I snapped it back on which seemed to have fixed it temporarily but it came back on the hwy. 3rd gear approaching 5k rpm and the car looses all power followed by an EML. Turning the car on and off has always immediately fixed the problem until the next drive cycle.

I looked into the tps sensors. I dont have a scope so the best I can do is test for resistance. I found the front tps to be showing 5k and 4.7kohm across pin 1-3 and 2-3 respectively. Resistances to the best of my knowledge be 4kohm and 1.2kohm. The sensor on the actuator gave 4.2kohm and 2.2kohm. I replaced both with brand new ones, the throttle pedal adaptation to no avail. Constantly getting fault code 230(throttle valve system set point deviation). Codes 107 (throttle valve system; adaptation), 120 (throttle valve signals inconsistent), and 119 (throttle valve potentiometer 2 signal) were also present but havent come back. Multiple misfire codes across all cylinders are also present but not apparent while driving.

Ive, tried multiple dmes with the issue persisting. Only thing that hasnt been touched is the actuator itself. Are these prone to failure? Is there a way to test the actuator before swapping?

I dont want to keep loading the parts cannon if I dont have to.

Thanks.

[randy72877]

I have had to replace the throttle actuator on at least a few of them.

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[JerryE21]

Is there a way to bench test them? If I find an used one is there a way of telling if its good or not?

[randy72877]

Best bet is to swap it out since the problem is intermittent.

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[e36seanp]

Hey Jerry,

Did you ever figure out what the issue was? I am in limp mode and Getting code 107 and I’m thinking it’s the actuator or throttles needing to be recalibrated. Thanks in advance