rough idle when cold

N

noslow86

New Member

Dec 30, 2003

68

0

0

sandwich il

Sep 3, 2005

#1

• Sep 3, 2005

• #1

ok i got a rough idle when cold runs 1000 rpms to 500 rpms when cold i aready change iac and running a 180 stat. could oxygen sensor be the cause i dont think its a vacuum leak because it only does it when its cold my tps is at 1.23 volts. i change intakes to a trick flow street and a 70mm thottle body with an egr spacer there is no leak at the intake or throttle body. it smells like raw fuel. i got the timing at 14 degress i need help

 

Crawlin306

Banned

Aug 31, 2005

14

0

0

Chicago, Illinois

Sep 3, 2005

#2

• Sep 3, 2005

• #2

Get a A/F gauge .. see if it's running lean or rich if its running rich thats why u need to either one replace o2 sensors or its not hooked up..

 

J

Jeff7477

Founding Member

Jul 2, 2001

176

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0

Lincoln, Nebraska USA

Sep 3, 2005

#3

• Sep 3, 2005

• #3

The computer doesn't even use data from the 02's until its warmed up though right?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Sep 3, 2005

#4

• Sep 3, 2005

• #4

Jeff7477 said:

The computer doesn't even use data from the 02's until its warmed up though right?

Click to expand...

absolutely correct. But the O2's can only take 30-120 seconds to light off.
Any codes?
Good luck.

 

N

noslow86

New Member

Dec 30, 2003

68

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0

sandwich il

Sep 3, 2005

#5

• Sep 3, 2005

• #5

reply

if it was o2 sensors wouldnt it idle like that all the time it only does this when its cold. could i need a msd box. im running trick flow intake cold air induction full exhaust timing at 14 degrees blaster coil 9mm plugs msd cap 3.73 gear. my check engine light never comes on dont even knows if it works.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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Sep 3, 2005

#6

• Sep 3, 2005

• #6

If you dont know if the CEL works, that is all the more reason to pull codes. It should come on when the key is on for a few seconds, before you start the car.

Codes can be stored w/o ever illuminating the light. It takes 5 mins to pull codes and might point you in the right direction.

Have you played with the idle setting at all lately?
Good luck.

 

N

noslow86

New Member

Dec 30, 2003

68

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0

sandwich il

Sep 3, 2005

#7

• Sep 3, 2005

• #7

reply

yeah i turned the set screw on the throttle body. would the tps being at 1.23 volts would that matter

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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Sep 4, 2005

#8

• Sep 4, 2005

• #8

I would take a run through this article and use what applies to you and skip others. But going through each step helps to get idles reset, since adjusting one thing can affect other components.
BTW, that TPS reading is borderline. Try and take it back down around 1.0 volt if you easily can.
Good luck.