Idle Rpms

A

Acid7711

Member

Sep 4, 2005

41

0

6

TN

Sep 13, 2005

#1

• Sep 13, 2005

• #1

Sorry if this has been covered before, but I've been poking around a lot of threads on here and been reading people's idle rpms. People have been saying everything from like 900 down to about 600rpms at idle. Right now, mine idles at about 850-900rpms. Is this too high? What is a good idle rpm to shoot for? I just got the car, so I'm still new and learning. This is for an 89 GT 5-speed btw.

Thanks for your help.

 

B

BlueThunder1988

New Member

May 19, 2003

102

0

0

Sep 13, 2005

#2

• Sep 13, 2005

• #2

They're all right... it depends a lot on your combo. FWIW, 900 or so is fine for a stock or near stock car on the street as you'll be spinning the alt and wp a bit faster for better power and cooling at idle.

 

A

Acid7711

Member

Sep 4, 2005

41

0

6

TN

Sep 15, 2005

#3

• Sep 15, 2005

• #3

Thanks for the fast reply One last question, should my throttle plate be completely closed at idle? On my other car it is, and the idle actuator motor on it controls the idle entirely on it's own. Should it be this way on the Stang as well, or should the throttle plate be cracked just a hair?

After either of these, I know I'd have to adjust the tps accordingly.

 

CoupedUp

Banned

Aug 26, 2005

260

0

0

Gone Fishing

Sep 15, 2005

#4

• Sep 15, 2005

• #4

The throttle butterfly should be pretty much closed (visually) at idle.

The adjustment screw on the bottom of the tb should have a paint mark from the factory (as it is pre-set) ... if the previous owner(s) have tampered with it you should be able to tell. It is possible with age that the paint has disapated for the most part, but you should be able to make out something.

As an average, a 5sp car should be around 700 rpms and an AOD about 850 with all sensors operating properly.

 

Zero_chance

Founding Member

May 29, 2001

1,244

7

59

Maricopa, AZ

Sep 15, 2005

#5

• Sep 15, 2005

• #5

Mines at 900 on a good day. She usually starts around 750 but once she gets warm anywhere from 9-11 is "normal" for me.

 

bluevenom867

I will have images of molesting stuffed animals in

Dec 15, 2003

1,704

1

0

St.Petersburg,FL

Sep 15, 2005

#6

• Sep 15, 2005

• #6

Zero_chance said:

Mines at 900 on a good day. She usually starts around 750 but once she gets warm anywhere from 9-11 is "normal" for me.

Click to expand...

Mine is just like that.

 

bluevenom867

I will have images of molesting stuffed animals in

Dec 15, 2003

1,704

1

0

St.Petersburg,FL

Sep 15, 2005

#7

• Sep 15, 2005

• #7

Zero_chance,you runing a carb?

 

A

Acid7711

Member

Sep 4, 2005

41

0

6

TN

Sep 15, 2005

#8

• Sep 15, 2005

• #8

Awesome! Thanks so much for the fast replys guys! I love this place

 

1EVIL88VERT

New Member

Jul 12, 2004

314

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0

Dyess AFB, TX

Sep 15, 2005

#9

• Sep 15, 2005

• #9

Zero_chance said:

Mines at 900 on a good day. She usually starts around 750 but once she gets warm anywhere from 9-11 is "normal" for me.

Click to expand...

mine does the same, but once warm stays at 900 all day

 

Zero_chance

Founding Member

May 29, 2001

1,244

7

59

Maricopa, AZ

Sep 15, 2005

#10

• Sep 15, 2005

• #10

BlueVenom, Im EFI and (not necessarily) loving it.

 

Euphoric306

New Member

Apr 5, 2004

905

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0

Sep 15, 2005

#11

• Sep 15, 2005

• #11

i set mine to 1000, i think it sounds better that way, and i really never let it sit at idle anyway, unless im at a stoplight or stuck in traffic

 

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bsedwebt70-5.0

New Member

Jul 1, 2004

320

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0

Charlottesville, VA

Sep 15, 2005

#12

• Sep 15, 2005

• #12

I have heard that 672rpm is stock for a 5spd car - mine idles at 775rpm smooth as silk w/ 16* timing and 42lbs fuel pressure 1.7roller rockers & stock internals