Engine High Idle 2002 Gt

R

Rello

New Member

Aug 13, 2015

2

0

1

Aug 13, 2015

#1

• Aug 13, 2015

• #1

So I have a 2002 GT(roush stage 1if it makes a difference) and recently I have had a code P0401 for egr come up. It then Started to idle anywhere from 1500 to 2000rpm at times. It only idled high after warming up. It's not a rough idle it gets there and it sticks. It's so bad that the car could drive itself in second car and sometimes 3rd when idling at 2000. I checked for leaks found none so I flashed the ecu and reinstalled the custom tune. It ran fine for 2 days then started to idle high again but the code never came back. Has anybody had this problem or can anybody help me out?

 

J

jeno_labanca

Member

Oct 10, 2014

109

6

18

Aug 13, 2015

#2

• Aug 13, 2015

• #2

Well since you got the code for the egr clean it or better yet do the egr delete since you have a tuner but you need the delete kit

Sent from my Nexus 6 using Tapatalk

 

trinity_gt

10 Year Member

Jan 31, 2003

3,125

81

99

Canada

Aug 13, 2015

#3

• Aug 13, 2015

• #3

I'd start with the IAC valve for the idle speed issue.

 

wmburns

SN Certified Technician

Aug 14, 2009

5,892

514

204

Houston Texas

Aug 20, 2015

#4

• Aug 20, 2015

• #4

Consider ruling out a vacuum leak before replacing parts.

Here's some more information:

Troubleshoot IAC idle problems 1996-2004
Troubleshoot IAC idle problems 1996-2004 | Mustang Forums at StangNet

 

Last edited: Aug 20, 2015

TeamCaffeineGT

Member

Mar 16, 2009

193

15

18

Springfield, MO

Aug 20, 2015

#5

• Aug 20, 2015

• #5

+1 on the IAC. This is pretty common. They will either idle high, or cause low idle/stall problems when they are on the outs. I would advise avoiding non-genuine replacements if the IAC has to be replaced. I went through 2 defective out of the box IACs from O'Reilys before I went to Ford. Best Luck!

 

S

SteveJessica

New Member

Aug 20, 2015

4

0

1

Aug 20, 2015

#6

• Aug 20, 2015

• #6

Check your tpc or iac

 

Hardtop68

Founding Member

Aug 23, 1999

193

1

16

Wherever they need me

Aug 23, 2015

#7

• Aug 23, 2015

• #7

Mine had high idle before due to the alternator's diode bridge failure. This also produced a hissing sound from the alternator that may be mistaken as a bearing problem.

 

R

Rello

New Member

Aug 13, 2015

2

0

1

Aug 30, 2015

#8

• Aug 30, 2015

• #8

So just a update. I decided to clean the TB, IAC, and EGR. Since then I have had no problem at all and that was back on Aug 15th.

 

wmburns

SN Certified Technician

Aug 14, 2009

5,892

514

204

Houston Texas

Aug 30, 2015

#9

• Aug 30, 2015

• #9

Score +1 for starting with the basics!!!

 

Reactions: Rello