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Old 10-04-2011, 09:10 PM   #1
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throttle position sensor adjustment

Is there any way to adjust the tps? Idle speed adjustment?

still Cant figure out whats wrong.

low horse power at low rpm? Help
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94 T-top Z28 350 Lt1/M-6 GU6-3.42 Diff, Magna flow catback
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Last edited by Rij1; 10-04-2011 at 09:24 PM.
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Old 10-04-2011, 09:27 PM   #2
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Re: throttle position sensor adjustment

On a stock TB, there should be no need for adjustment. That is why there is no provision to do it. Only if there is some trouble indication (usually a code), should there be cause for concern. Maybe if you gave more reason why you think this is needed. Aftermarket TBs often require slotting of the mounting holes to achieve a TPS reading in the stock, closed throttle range.
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Old 10-04-2011, 09:32 PM   #3
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Re: throttle position sensor adjustment

I just seen on this site some one mentioned adjusting it. And I was told to replace it and the car seems to run worse then it did already.
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Old 10-04-2011, 09:59 PM   #4
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Re: throttle position sensor adjustment

I thought the tps would only cause erratic shifting, does it also cause rough runnig, etc?

I can tell you that I got a TPS voltage too low code and I took my tb off and cleaned everything, expecting to solder, rather than crimp the tps connector wiring I had crimped months ago, but it all looked really solid. So I buttoned everything up and checked it with a scanner and it was above the minimum voltage and the code didn't come back when I started it. But that may have been some kind of fluke. My TB is a stock TB ported to 54 mm.
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Old 10-06-2011, 08:55 AM   #5
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Re: throttle position sensor adjustment

Speaking first hand, yes your car will run like crap and shift like crap if your tps isn't adjusted properly.on an aftermarket tb you enlarge the boltholes of the tps so u can turn it clockwise or counter clockwise. You use a multimeter too read the voltage off the blue wire. Depending on what year your car is the voltage should vary slightly.
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Old 10-06-2011, 09:37 AM   #6
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Re: throttle position sensor adjustment

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Originally Posted by Rij1 View Post
I just seen on this site some one mentioned adjusting it. And I was told to replace it and the car seems to run worse then it did already.
What is a scanner telling you about the TPS values? What was the cause for replacing it?

BTW, idle speed is controlled by the PCM.

I see on your other thread the shop told you to change the tps. Did they give you a reason for wanting to change it?

Last edited by shoebox; 10-06-2011 at 09:43 AM.
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Old 10-06-2011, 12:51 PM   #7
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Re: throttle position sensor adjustment

The scanner didn't show anything about it. The problem I'm having seemed like the tps could possibley be bad. But I changed it and the car ran worse so I put the old one back on.
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Old 10-06-2011, 01:15 PM   #8
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Re: throttle position sensor adjustment

Specifically what values did the scanner tell you about the TPS?
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Old 10-06-2011, 01:27 PM   #9
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Re: throttle position sensor adjustment

I really don't know, the first shop i had the car in scaned everything. this last shop I took it to just told me to change the tps to see if it helped my problem before I leave it with them next week. I'm goint to try and test the tps today.
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Old 10-06-2011, 07:40 PM   #10
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Re: throttle position sensor adjustment

http://members.***.net/chipsbyal/page/idle/#stocktbi
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Old 10-07-2011, 02:32 PM   #11
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Re: throttle position sensor adjustment

I cant get to a scanner till monday so I just tested the tps with a multimeter and with the harness disconected the + (grey wire) reads 5v with the harness connected it also reads 5v. the ground(black wire) wire reads .6 ohm's with the key off and .477ohm's with the key on.
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Old 10-07-2011, 03:00 PM   #12
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Re: throttle position sensor adjustment

Other than just pure scanner and voltage values did you find that useful in actually understanding they idle system?
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Old 10-07-2011, 03:16 PM   #13
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Re: throttle position sensor adjustment

Yeah, good to know the conversion of stock and performance.
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Old 10-07-2011, 03:26 PM   #14
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Re: throttle position sensor adjustment

Since i'm on this subject I have a question about the coolant temperature sensor affecting the ground wire to the tps/making the fans come on rite when i turn the key when cold or hot. it isnt on my z28 its on my grand prix but i'm sure these thing are the same concept.
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Last edited by Rij1; 10-07-2011 at 03:35 PM.
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Old 10-07-2011, 04:17 PM   #15
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Re: throttle position sensor adjustment

Quote:
Originally Posted by Rij1 View Post
I cant get to a scanner till monday so I just tested the tps with a multimeter and with the harness disconected the + (grey wire) reads 5v with the harness connected it also reads 5v. the ground(black wire) wire reads .6 ohm's with the key off and .477ohm's with the key on.
Did you measure the voltage between the blue wire and the black wire? That's your signal voltage. Measure it with the harness connector on the TPS. Get values for closed throttle, WOT and watch the voltage as you slowly rotate the blades from fully closed to fully open. The voltage should increase smoothly, with no voltage spikes or dropouts.
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