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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 01-28-2013, 08:55 AM
Smalls92 Smalls92 is offline
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97 328i p1765 p0121 codes

ok car originally started shifting irregular meaning i would be driving along about 35 40 mph and the car would just down shift the trans light would come and on would go into what ill call fail safe mode and then it would shift and run fine i took it to my buddy who has been a mechanic for over 25 yrs said it needs a tps sensor, bank 1 o2 sensors not a problem i order them both installed the tps sensor yesterday waiting for the o2 to arrive later this week, the problem is that it's still doing the same thing with the shifting my car has acs and i see there are 2 what look to be tps's but i can't find any information on the other one even looking in my copy of alldata i have attached a pic with it circled is this another tps 1 for the acs and another for regular tps ? as you can i have already one of them

sorry for the noob questions im just trying to find out if i actually have 2 tps's or not ?

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  #2  
Old 01-28-2013, 09:33 AM
hnaz hnaz is offline
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Did you reset the check engine light after changing one of the sensors?
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  #3  
Old 01-28-2013, 10:08 AM
Smalls92 Smalls92 is offline
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no i did not i was going to do it after i replaced the o2 sensors wasn't aware bmw had to manually reset im more familiar with American car procedures
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Old 01-28-2013, 10:54 AM
hnaz hnaz is offline
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Usually you don't, but sometimes you may have to reset it, hook up the code reader and look for the pending codes. If you see the code pop up as a pending code, then you may have bigger problems.

But it takes 4 cycles (I think) before it would clear on its own.
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Old 01-28-2013, 12:25 PM
Smalls92 Smalls92 is offline
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Will do thanks and as cor the other sensor? Idle sensor?
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  #6  
Old 01-28-2013, 06:22 PM
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drivinfaster drivinfaster is offline
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no, the one closest to the air filter is your asc throttle, which is normally open. it closes when wheel spin is detected to reduce rpm and aid in maintaining control of the vehicle.

as for codes, they both indicate throttle position codes. you *shouldn't* have to clear the code for the computer to relearn, but i am not certain if the tps is adjustable or not. if the mounting holes are round, then you should be good. if elongated, then you need a dvom to read the voltage with the key on/engine off (koeo) and move the sensor to spec.




have not had to replace a tps on any bmw, though. not that they can't fail, just not very common though.




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Old 01-28-2013, 06:57 PM
Smalls92 Smalls92 is offline
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im aware the one not circled is the asc tps I have replaced that due to the code that it was throwing im trying to find out what the one circled is though

reason that im asking is before I replaced it my rpm would vary at idle from 500 to 1000 rpms up and down and it would also down shift driving down the road all this are signs of a bad tps especially the rpm change during idle
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Old 01-28-2013, 06:58 PM
Smalls92 Smalls92 is offline
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they are round holes no elongated also
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  #9  
Old 01-28-2013, 07:30 PM
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drivinfaster drivinfaster is offline
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hunting idle is usually related to a dirty idle control valve.

the one you have circled is the throttle position sensor, and is a direct input to the dme for driveability. the asc throttle sensor does not affect the idle, and is only an input for the asc, it does not actually close the asc throttle. there should be a motor for that with a cable to operate the throtte.



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Old 01-28-2013, 07:35 PM
Smalls92 Smalls92 is offline
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awesome thank you so I replaced the wrong part good to know now I have to order a regular throttle position sensor got to love site that ask you if you have traction control you say yes and they send you the asc position senor instead of the throttle position sensor, and that explains why my car is still doing the same exact thing it was before replacing thank you so much drivinfater for you time on this matter

ill make sure to read the actual part number off the part this time

mind telling were the idle control valve is located

Last edited by Smalls92; 01-28-2013 at 07:40 PM.
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  #11  
Old 01-28-2013, 07:46 PM
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drivinfaster drivinfaster is offline
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ubder the intake, it's not a bad diy, and there are lots of write ups and pics on teh interwebz. the e46 is also very similar. the e30 is a little bit easier as it is mounted on top, but they all look alike.




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  #12  
Old 01-28-2013, 07:47 PM
Smalls92 Smalls92 is offline
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great ya I read on it seems straight forward thanks yet again
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