Up and down idle???

J

jakef7

Member

Feb 22, 2011

44

0

7

Texas

Apr 17, 2011

#1

• Apr 17, 2011

• #1

Hey guys, my car is idling really weird. Its up and down up and down. Its driving me crazy!!! Sometimes it almost stalls out on me. The only thing I have done to the motor is intake/tune. I called the guys at Brenspeed and they suggested that I clean my throttle body. I did that and still no change. When I turn on the AC it gets even worse. Does anybody out there know what might be causing this? Really would appreciate the help.

 

Az Pete

10 Year Member

Mar 30, 2005

711

18

49

Panama City, Fl.

Apr 17, 2011

#2

• Apr 17, 2011

• #2

Go back to the stock tune and see if it continues. If it continues, leave the stock until solved.....If it is not there, go back to Brenspeed with the problem.

The A/C on only creates more of a load on the engine causing the change to seem more drastic. Any codes?

 

jpplaw

Member

Jan 14, 2009

185

3

18

Apr 17, 2011

#3

• Apr 17, 2011

• #3

Look for a vacuum or air leak somewhere. Check all the CAI connections.

 

J

jakef7

Member

Feb 22, 2011

44

0

7

Texas

Apr 17, 2011

#4

• Apr 17, 2011

• #4

I might just put it back to stock and take it to ford. If it quits after I switch it to stock I'll get back in touch with Brenspeed, though they said they have never have had an idle problem with their tunes. Anybody else???

 

jaybertx

Member

Apr 18, 2003

387

1

18

Sarasota, FL

Apr 17, 2011

#5

• Apr 17, 2011

• #5

Bad coil pack maybe? I had that issue with my '01 and that's what it ended up being.

 

R

Rhymhoont

New Member

Feb 14, 2011

29

0

0

Apr 20, 2011

#6

• Apr 20, 2011

• #6

jaybertx said:

Bad coil pack maybe? I had that issue with my '01 and that's what it ended up being.

Click to expand...

This is exactly what my 02 F150 did and after a few months it started to miss sometimes at very low throttle at 60mph. It FINALLY gave a warning light, and it was a coil pack. After 160,000 miles I have had to do this 3 times.

See if you mechanic can find a code that may or may not be saved in your computer.

 

2

2faststangs

New Member

Feb 2, 2011

1

0

0

Apr 20, 2011

#7

• Apr 20, 2011

• #7

Same thing is happening with me now. Started after i loaded my BBR tune, stopped when i returned to stock. The problem is in the tune, contact Brenspeed and tell them you want another tune written.