RPM's Dropping...?

I

impulse001

New Member

Jan 16, 2008

84

0

0

New Jersey

Apr 7, 2008

#1

• Apr 7, 2008

• #1

So when I idle my car, the RPM's drop to around 650, and as its sounding like it's going to shut off, they shoot back up to 1000/1100.. Drives fine, and if I give it some gas it will stop doing it for a little, but then start again.

I took out the throttle body a few days ago to clean it, could It have something to do with that?

 

bloopbloob

Member

Sep 27, 2006

578

4

16

Alberta

Apr 7, 2008

#2

• Apr 7, 2008

• #2

codes. did you change anything with the tps or iac? could be a lot of things. dump the codes.

 

5.0Droptop

...all those nights we shared, and you're a dude??

Special Agent Mukity-Muck Whats in Charge Round Here

May 15, 2002

1,785

1,130

233

Indiana

Apr 7, 2008

#3

• Apr 7, 2008

• #3

Did you replace the alt yet? If not its running on low voltage it will make it act strange.

Taking the TB off could have messed with the idle settings and TPS settings.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,258

17,941

224

Massachusetts

Apr 7, 2008

#4

• Apr 7, 2008

• #4

Reset the idle.

Unplug the IAC and let the engine idle. Adjust the idle using the idle stop screw to bare minimum idle (the lowest it will go while letting the engine idle)

reset the computer

plug IAC back in

start car and let it relearn idle strategy

 

5.0Droptop

...all those nights we shared, and you're a dude??

Special Agent Mukity-Muck Whats in Charge Round Here

May 15, 2002

1,785

1,130

233

Indiana

Apr 7, 2008

#5

• Apr 7, 2008

• #5

word...

Check tps while at it....Test with digital volt meter, Use the black wire as ground green wire is positive. Set it to .97-.99 volt. To adjust it loosen the 2 screws and turn + or -

 

mustangfan1990

New Member

Jul 17, 2005

505

1

0

Lenoir, North Carolina

Apr 7, 2008

#6

• Apr 7, 2008

• #6

my car does the same thing and I have tried every trick in the book. I finally got mine fixed when I got mine tuned

 

fiveohwblow

Official Member

15 Year Member

Jul 21, 2005

2,169

145

155

Apr 8, 2008

#7

• Apr 8, 2008

• #7

mustangfan1990 said:

my car does the same thing and I have tried every trick in the book. I finally got mine fixed when I got mine tuned

Click to expand...

+1. The other ways mentioned will fix manual problems but I have had the same issue both before one tune, and after another. Point is it can be tuned out if your tuner knows what he is doing.