| From | Message |
Doug
Dodge Dakota
JOIN HERE
5/10/2005
20:49:31
|
 Subject: TPS
IP: Logged
Message:
I just recently swapped my stock 3.9 V6 throttle body for a stock 5.2L V8. In the process of adjusting and cleaning all of my sensors i found that i could not get my TPS voltage any lower than 0.762VDC. Now i know that the optimal range is 0.70-0.75VDC. Can anyone give me any pointers. (I haven't reamed out the inserts in the TPS yet, but i am nervous to do so). Incidentally, the truck has nice smooth acceleration, but is slightly hesitant when it first starts out in 1st gear, but then comes on strong...i attribute this to the computer having to "learn" the new air volume. Thank you in advance.
|
Doug
Dodge Dakota
JOIN HERE
5/10/2005
20:50:45
| RE: TPS
IP: Logged
Message:
By the way sorry...1997 3.9L Reg Cab Sport 2X4.
|
Sheeeshh
Dodge Dakota
JOIN HERE
5/11/2005
08:31:49
|  RE: TPS
IP: Logged
Message:
"i could not get my TPS voltage any lower than 0.762VDC. Now i know that the optimal range is 0.70-0.75VDC. Can anyone give me any pointers. "
How close do you think you can get? Good enough.
|
Doug
Dodge Dakota
JOIN HERE
5/11/2005
09:35:08
| RE: TPS
IP: Logged
Message:
Well, sheesh, when dealing will electronic components, even a tenth of a volt will make a BIG difference. I just wanted to know if anyone else had run into this problem. Have you ever noticed any slushishness when throttling your engine in neutral? A slight hesitation? Put a fluke or volt meter on the middle pin of your TPS, i bet it is high or lower than the optimal.
|
Brandon
Dodge Dakota
JOIN HERE
5/11/2005
11:52:58
| RE: TPS
IP: Logged
Message:
This is off the subject but how do you like your throttle body swam? Can you tell a differance.
|
Sheeshhhh
Dodge Dakota
JOIN HERE
5/11/2005
12:37:08
| RE: TPS
IP: Logged
Message:
"Well, sheesh, when dealing will electronic components, even a tenth of a volt will make a BIG difference."
Depends. Sometimes yes, sometimes no. But 0.012 volts will not matter in this case.
|
six pak
Dodge Dakota
JOIN HERE
5/11/2005
17:37:25
| RE: TPS
IP: Logged
Message:
Check the IAC count, if you have to adjust throttle stop down to get optimun reading,this will also lower the TPS reading.
|
another mark
Dodge Dakota
JOIN HERE
5/11/2005
18:00:09
| RE: TPS
IP: Logged
Message:
A thread about one hundredth of a volt?
You could buy a new TPS if you're that paranoid.
|
Just Looking
Dodge Dakota
JOIN HERE
5/11/2005
18:16:58
| RE: TPS
IP: Logged
Message:
What i did instead of grinding out the brass fitting on the sensor was grind the screws a little thinner. (not the threads) It will give u more then enough adjustment.
|
Doug
Dodge Dakota
JOIN HERE
5/11/2005
21:08:53
| RE: TPS
IP: Logged
Message:
Thanks to all the replies. I tried JUST LOOKING's idea and it worked great. Oh, and by the way sheesh and another mark, if you don't have anything constuctive to add please take it elsewhere. IT WAS A NEW TPS!! and that tiny one hundreth(in this case it DOES matter because of the transistors that it drives) of a volt gave me clean crisp acceleration when throttle...no hesitation. To Brandon, i felt a big difference in "pick-up" in 4th and 5th gear and in the overall change in the pitch(noise) of the motor(more of a hollow open throttle sound). It won't be till after the PCM adjusts that i'll notice any change in GPM.
Thanks, Doug
|
another mark
Dodge Dakota
JOIN HERE
5/11/2005
22:09:05
| RE: TPS
IP: Logged
Message:
Hmm. Learn something new every day.
|
another mark
Dodge Dakota
JOIN HERE
5/11/2005
22:15:30
| RE: TPS
IP: Logged
Message:
You never said anywhere in your post this was a new TPS.
"In the process of adjusting and cleaning all of my sensors"
Sounds like you were reusing sensors to me. They do go bad sometimes over time.
|
sheesh
Dodge Dakota
JOIN HERE
5/12/2005
08:07:15
| RE: TPS
IP: Logged
Message:
And what is your closed-throttle reading now? You didn't say. But again, 0.012 volts will NOT make that much of a difference when the scale is 0.7 to 4.0 volts. .012 volts is only 0.4% of the range. There's no way that you can distinguish a change of 0.4% of the scale. You did something else to alleviate the problem; most likely, fiddling with it just realigned the TPS properly with its mechanical fit against the throttle shaft.
My reply was constructive, if you don't want free advice, don't read it. I'm an electrical engineer with 20 years experience, and can charge for advice.
|
Doug
Dodge Dakota
JOIN HERE
5/12/2005
18:59:57
| RE: TPS
IP: Logged
Message:
0.712 I was asking an honest question when i started that thread, and my problem was corrected by a "helpful" reply. Your reply, did not look to me that you were "intending" to help. I forgot to mention that the sensor was brand new as of 3 months ago, and that the cleaning of the various sensors did not really include the TPS(just a brief inspection and wipe down) The final closed throttle voltage on the other hand did help(the mechanical fit was checked and corrected before i started the thread). I know it may not seem like much, but i noticed the crisp throttle after it and only it was adjusted. I too am an electrical engineer but with only 5 years of experience, and i go by the motto of "work smarter, not harder", so why add or subract components from a reliable electronic system when i can easily ask if anyone had had this problem in the past?
Thanks,
Doug
|
sheesh
Dodge Dakota
JOIN HERE
5/13/2005
08:18:53
| RE: TPS
IP: Logged
Message:
Well, my reply was intended to be helpful, i.e., look elsewhere and not focus on a 0.4% change of scale. Dropping the closed throttle reading from 0.762 to 0.712 merely expanded the range by about 1.5%. Since the factory service manual says that the TPS lower limit is 0.2 volts, whatever solved your problem was not strictly lowering the voltage by 0.05 volts. Far more likely that fiddling with its mounting solved a mechanical fit problem.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
