TPS Idle Voltage

O

OrLackThereof

New Member

Mar 9, 2003

560

0

0

Palm Bay, FL

Mar 18, 2004

#1

• Mar 18, 2004

• #1

Just wondering what you guys recommend I set my TPS at at idle. My idle speed is around 750 rpms or so and the TPS currently reads about 0.99 volts.

 

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TheUser

Active Member

Jul 25, 2003

1,859

1

36

Springfield, MO

Mar 18, 2004

#2

• Mar 18, 2004

• #2

OrLackThereof said:

Just wondering what you guys recommend I set my TPS at at idle. My idle speed is around 750 rpms or so and the TPS currently reads about 0.99 volts.

Click to expand...

I wouldn't touch it

 

fordman54935

Member

Jan 10, 2003

301

0

16

Wisconsin

Mar 18, 2004

#3

• Mar 18, 2004

• #3

You should be all set to go at 0.99 volts. The target range is usually between 0.96 and 0.99 volts. I've seen them way off before, even my own car was set at like 0.85 when I bought it.

 

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thompsonsd

Founding Member

Aug 15, 2002

144

0

0

Southern Maryland

Mar 18, 2004

#4

• Mar 18, 2004

• #4

Mine is set at .993 with around 850 rpm's. Is it better to set it at 750 rpms? Cause with my cam I'm about to cut off if I go down to 750....

 

stang&2Birds

Founding Member

May 4, 2000

2,091

5

58

New England. :-) CT/MA

Mar 19, 2004

#5

• Mar 19, 2004

• #5

Buy the book Probst, and stop doing stupid --- ricer mods with the tps! In other words, GET A CLUE!

As long as the TPS is between ~.5v and 1.3v at idle, then LEAVE IT ALONE! Spend your time putting on the 12 foot wing with the neon on it.

Read the TPS section in Probst. Buy a tweecer, look at the EEC code, do what you want. But, stop doing the stupid ricer TPS mod!

BTW: The TPS is reset at startup AND while the car is running. Around 93, Ford added a diag check to see if the TPS voltage was above ~1.4v at idle and always stayed that high. See my sig, get the book by Probst.

 

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OrLackThereof

New Member

Mar 9, 2003

560

0

0

Palm Bay, FL

Mar 19, 2004

#6

• Mar 19, 2004

• #6

Nope, no ricer mods here. Just making sure my voltage is ok, because the car has been plagued lately with idle problems, random misfires, and bogging. All the plugwires read between 80 and 90 ohms on a resistance test, fuel pressure checked out ok (we bumped it after we checked an extra 5 psi to compensate for a lean condition), along with engine vacuum, and TPS voltage, and IAC valve operation, and the cap and rotor are new as of yesterday. The problem improved slightly... I'm thinking I've just got some old plugs...theyre slightly lean as I mentioned and have high speed glazing....theyre not bad by any means, but....it's all I can think of left to do.

 

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sublime29

New Member

Mar 18, 2004

110

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0

Mar 19, 2004

#7

• Mar 19, 2004

• #7

Hello If the idle problem is not real bad just somethin you always pay attentin too and are nit picking leave it alone.It could just be your cam and head mods.I think all 5.0's that are moded have rough idles. Later Sub

 

The Shape

Founding Member

Jan 11, 2002

2,224

8

49

East ARKANSAS Delta

Mar 19, 2004

#8

• Mar 19, 2004

• #8

I am with stang&2birds on this one. I think setting the TPS voltage is a waste of time. I have done it before , but when I had to replace my TPS last year I just bolted it down and never checked it with no problems at all. And anyone who does electronics work will tell you that even the best most expensive multi-meter you buy isn't gonna be accurate down to a millivolt. I am willing to bet if you pulled two high end meters off of the shelf and checked your TPS sensor with them. They would have different readings. Unless your ECM is throwing a code for the TPS I wouldn't even bother touching it.

 

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90bluegt

Founding Member

Dec 9, 1999

592

0

16

Mar 19, 2004

#9

• Mar 19, 2004

• #9

Set the voltage to .96 - .99 and you will be all set.
Yea, the shape, you have done the TPS before, and on a stock stang you don't have to set the TPS. Once you start putting some major mods on the car, (ie. heads, cam, intake, bigger TB) you are going to have to set the TPS or the car won't idle. I swapped a new engine in my car with the mods in the signature, my car wouldn't idle right or the moment that i stepped on the gas then let it idle down it would die. Guess what fixed it, the TPS setting was totally messed up. It needs to be within certain tolerances for the car to idle right. Both you and Stang&2birds have stock Mustangs. Hate to say it, but on a stock TB you can't adjust the TPS sensor. That's why you didn't have to adjust anything. If you think that setting the TPS is a waste of time you need to go and read some more books about tuning.

 

QDRHRSE

New Member

Dec 31, 2002

1,590

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0

Palmdale, CA

Mar 19, 2004

#10

• Mar 19, 2004

• #10

As long as your sure the TPS switch is operating correctly you shouldn't have to touch it at all really. Especially set at .99.

 

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tcmustang

Founding Member

Jul 1, 2002

185

0

0

Columbus Ga.

Mar 19, 2004

#11

• Mar 19, 2004

• #11

While you guys are on the subject...I posted on this site and the 94-95 yesterday and got no responses, but my 93 modded car I know how to check and set the TPS, BUT on a 95 I just installed Trick Flow intake, heads, 70mm TB, 73mm Mass Air and the Edlebroch Tech department told me over the phone to set the idel voltage at SIX volts. I told him I did not think that was right and he checked , called me back at home later and said it was. What do you think. By the way my car will not idel. I have NOT touched the TPS.

 

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OrLackThereof

New Member

Mar 9, 2003

560

0

0

Palm Bay, FL

Mar 19, 2004

#12

• Mar 19, 2004

• #12

90bluegt said:

Hate to say it, but on a stock TB you can't adjust the TPS sensor. That's why you didn't have to adjust anything. If you think that setting the TPS is a waste of time you need to go and read some more books about tuning.

Click to expand...

I have a stock TB and my TPS is adjustable. However the TPS is NOT the factory one.

I was just asking this to double check. My main problem isn't the idle. I have idle issues, but they don't show up very often and I'm not worried about them. I'm just trying to hunt down the solution to an off-idle bog and random, occasional misfire under acceleration. Only thing I can think of is I somehow fouled out a plug, as unlikely as that sounds to me.

 

Mike86Stang

Advanced Member

Apr 11, 2000

10,296

0

77

Red Lion, PA

Mar 19, 2004

#13

• Mar 19, 2004

• #13

The TPS should never see SIX volts..... it operates at v-ref (5.0v) so there fore should never exceed this. The EEC think you are at WOT at anything above 4.5v (I think )