Bouncy idle after offroad h install

deftsound

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Apr 6, 2004

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Texas City TX

Oct 8, 2005

#1

• Oct 8, 2005

• #1

Well i just got done installing my offroad h, i reset the computer and im noticing the idle bounces a little and wants to stick sometimes. I noticed it mostly happens when i let off the gas in first gear and come to a stop, it goes all the way down to 500rpms and comes close to dying then comes back up. Any suggestions?

 

sgarlic

Founding Member

Apr 21, 2001

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Oct 8, 2005

#2

• Oct 8, 2005

• #2

Your pipe swap shouldn't have affected your idle at all, unless you messed with a wire somewhere, or were playing with the TB or IAC.

 

timeless2

Vi Veri Veni Versum Vicus Vici

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Nov 29, 1999

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Oct 8, 2005

#3

• Oct 8, 2005

• #3

Did you reset the PCM? I.E. disconnect the battery during the install and reconnect afterward?

 

deftsound

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Apr 6, 2004

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Texas City TX

Oct 8, 2005

#4

• Oct 8, 2005

• #4

yea i had to extend the o2 sensors so we spliced into them and put about 4 inches of extra wire in between...maybe i got the sensors mixed up on the rear

 

sgarlic

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Apr 21, 2001

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Oct 8, 2005

#5

• Oct 8, 2005

• #5

Rear ones shouldn't affect idle, all they do is monitor the efficiency of the catalytic converters.

 

deftsound

Please ask me how much my supercharger cost

Apr 6, 2004

945

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Texas City TX

Oct 8, 2005

#6

• Oct 8, 2005

• #6

yup i unplugged the negative during install then unplugged hte positive for about 15 mins just to make sure

 

deftsound

Please ask me how much my supercharger cost

Apr 6, 2004

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39

Texas City TX

Oct 8, 2005

#7

• Oct 8, 2005

• #7

well i know we did a good job when we extended the two front ones

does it take time for the computer to get used to the new exhaust? If so then that oculd be the problem, ive only driven about 5 miles so far..

 

timeless2

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#8

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No SES light?

 

deftsound

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Apr 6, 2004

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Texas City TX

Oct 8, 2005

#9

• Oct 8, 2005

• #9

no it came on

 

timeless2

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#10

• Oct 8, 2005

• #10

deftsound said:

no it came on

Click to expand...

Hence your crappy idle.

1. Your o2 sensors might be reversed (front/back, not left/right).
2. Your MIL job might not be doing what you had hoped.
3. There's a loose connection on your front o2's.

This assumes all else remains the same.

 

sgarlic

Founding Member

Apr 21, 2001

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#11

• Oct 8, 2005

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Yea.. should've mentioned your MIL is on.. pull the codes from autozone or whatever to see what it is.

 

deftsound

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Apr 6, 2004

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Oct 9, 2005

#12

• Oct 9, 2005

• #12

ok i dont have mil eliminators, i extended the 02 sensors in the front cause they wouldnt reach

 

deftsound

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Apr 6, 2004

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Oct 9, 2005

#13

• Oct 9, 2005

• #13

also i had heard the front two 02's were interchangable, they are both green, is this true?

 

timeless2

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#14

• Oct 9, 2005

• #14

deftsound said:

ok i dont have mil eliminators, i extended the 02 sensors in the front cause they wouldnt reach

Click to expand...

There's your problem, man. You have to fool/loop the reading going back to the PCM from the rear o2's after removing your cats.

 

deftsound

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Apr 6, 2004

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Oct 9, 2005

#15

• Oct 9, 2005

• #15

but why woudl not having mil eliminators and the check engine light effect how my car runs?

BTW ran the codes and this is what i got: p0174: the pcm has determind during the testing that the fuel system for bank 2 was too lean. (bank 1 identifies the location of cylinder 1 while bank 2 identifies cylinders on opposite bank)

 

Mossberg

Active Member

Jul 21, 2003

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ATL, Shawty

Oct 9, 2005

#16

• Oct 9, 2005

• #16

My Mil has been on for ages and I have no problems and consistently get 21-24 mpg. I will eventually get a tuner to kill the rear O2 sensors though.

 

deftsound

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Apr 6, 2004

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Oct 9, 2005

#17

• Oct 9, 2005

• #17

any inputs on the code i ran? I think im just gonna buy new already extended o2's

 

deftsound

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Oct 9, 2005

#18

• Oct 9, 2005

• #18

ok i think from the code i got that i must have messed up one of those 02's or not spliced them right, so im saying **** it and im gonna go buy already extended o2's.

Does anyone know where to buy an already extended 02 sensor thats like 12 inches?

 

timeless2

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#19

• Oct 9, 2005

• #19

deftsound said:

ok i think from the code i got that i must have messed up one of those 02's or not spliced them right, so im saying **** it and im gonna go buy already extended o2's.

Does anyone know where to buy an already extended 02 sensor thats like 12 inches?

Click to expand...

Any parts store can hook you up. NAPA, Autozone, O'Reilly's.

 

deftsound

Please ask me how much my supercharger cost

Apr 6, 2004

945

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Texas City TX

Oct 9, 2005

#20

• Oct 9, 2005

• #20

is their a specific kind i need? I noticed they were color coded..