M20b25 starting rough (TPS Code)

[Mr. EG]

I recently purchased an E30 and it runs decent, but stutters and bogs every great while and the CEL illuminates every trip. I used the stomp method to pull the code and it was...

Long blink (I believe that would count as a 1)
pause:
One long blink
pause:
2 Long blinks
Pause:
Six short blinks

I have no idea why this code is not showing on the CEL FAQ, but I believe its the TPS sensor. It makes sense that the potentiometer is getting stuck and not reading the correct throttle position. The car is a 89' 325i all stock 5spd with an M20b25.

This is the site I am working off of. http://e30world.com/fuel/BMW-E30-DME...ic-fault-codes

[Mr. EG]

I also wanted to mention I tried cleaning the pins and the connectors and it did not help. I believe I need a TPS (3 wire), i would just like others opinions.

[nebulous123]

hesitating could also be linked to the MAF. you have to cut the silicon glue off. you also have to clean the copper and bend the needle so it makes good, fresh contact. should help with that.

[Mr. EG]

Thanks for the info.

[DaveSmed]

I would not suspect the TPS. It's a "dumb" two position switch, idle and wide open. All load data is from the airflow meter.

[Mr. EG]

What exactly is the "airflow" meter? Are you referring to an O2 sensor. And my code indicates a TPS issue

[ttrousdell]

This is the maf it is located on the intake before the throttle. It lets the ecu know how much air is coming into the engine and will effect fuel injection. A defective maf will also cause the symptoms you describe.

[Mr. EG]

Awesome, I will look into that also.

[blocke]

Curious how the stomp test would work if the tps is bad?

[Mr. EG]

It illuminates a code. My code indicated it was a TPS issue.

[bastianshaw]

That code is wrong. Google e30stomp test and read. The long blink is the sign it's entering in to the diagnostic mode.

[blocke]

It illuminates a code. My code indicated it was a TPS issue.

What I meant is the a functioning TPS sensor is a prerequisite to the stomp test working. If it doesnt register WOT and closed throttle, the stomp test wont work.

[Mr. EG]

I believe it gets stuck in certain RPM ranges (potentiometer issue). I will be replacing both the AFM and the TPS.