 Throttle Position Sensor (TPS), Dave, Brad and Cap'n and other FI experts |
|
|
|
Tuesday, 22 July 2025 |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| mtndawg |
 Dec 23 2009, 11:24 PM
Post
#1
|
|
Member  Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None 
 |
Can someone give me a good description of what the TPS signals to the ECU? My car was bucking when accelerating and when I would try to hold steady. I took the TPS out and cleaned it with electrical cleaner. It looks fairly worn and I get 18 clicks instead of 20. I think I'm supposed to hear 20. Now that it's clean (and adjusted) the car is running MUCH better, but I still hear only 18 clicks when I press the gas with the key on (and the engine off).
It's not bucking now, but now my idle is low at start when the engine is cold, then it's high (1500) when the engine is warm. I need to make some other adjustments, take a look at the trigger points and clean the screen at the bottom of the fuel tank too. ...so I want to know how the board and wipers signal the ECU? |
   |
 
|
  |
Replies
| ClayPerrine |
Dec 24 2009, 11:53 AM
Post
#2
|
|
Life's been good to me so far..... Group: Admin Posts: 16,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
|
The TPS in a D-Jet system is not a variable resistor like modern FI systems. The "little squggily lines" you see are contacts that switch back and forth with the wiper contacts passing over them. They add additional pulses to the injectors for acceleration, same as the accelerator pump on a carb. The normal pulses trigger the injectors in pairs when that contact in the trigger points fire. The injector dwell determines the amount of fuel injected, and that is varied based on input from the MPS and the temp sensors.
Hope that helps... |
|
|
|
Posts in this topic
mtndawg Throttle Position Sensor (TPS) Dec 23 2009, 11:24 PM
underthetire Did you calibrate it with the procedure once you t... Dec 23 2009, 11:33 PM Strudelwagon
Can someone give me a good description of what th... Dec 23 2009, 11:34 PM kg6dxn I can give you the generic version onf the TPS sig... Dec 23 2009, 11:44 PM
underthetire
I can give you the generic version onf the TPS si... Dec 23 2009, 11:50 PM mtndawg I've read pbanders site, which is super helpfu... Dec 24 2009, 12:55 AM etcmss setting the TPS is already addressed. But you sai... Dec 24 2009, 06:07 AM ConeDodger The clicks are only the initial adjustment. You ne... Dec 24 2009, 09:04 AM mtndawg Here's the way I understand the different part... Dec 24 2009, 11:43 AM r_towle If you only hear 18 clicks, you have not adjusted ... Dec 24 2009, 12:32 PM mtndawg Thanks for the comments! I think my TPS adjust... Dec 24 2009, 02:11 PM zymurgist Babydoll had a problem where the wire came loose f... Dec 24 2009, 02:20 PM davesprinkle As a couple of other posts have mentioned, the dje... Dec 24 2009, 04:25 PM Bleyseng Ok, the poor idle subject has been covered a billi... Dec 24 2009, 05:10 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 22nd July 2025 - 05:25 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.