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rough idle after h/c,video inside

  • Thread starter Thread starter 95mustang_gt
  • Start date Start date Jun 3, 2006
9

95mustang_gt

New Member
Mar 30, 2005
364
1
0
Wisconsin
Jun 3, 2006
#1
  • Jun 3, 2006
  • #1
Well i got done with my head and cam change yesterday.I have a rough idle and i tought it was the timing but i check it today its at 12*.I tryed it at 8* and 10* and it still feels the same.I made a video and see what you guys think.I put new spark plugs.I do have a header bolt messing could that cause a rough idle.I pull codes in koef and i got 172 and thats it.I will try the koer later.let me know what you guys think.The idle is around 700-800

mov02102.mpg


thanks
Jesse
 

1TallMF

New Member
Apr 17, 2006
955
1
0
Montreal
Jun 3, 2006
#2
  • Jun 3, 2006
  • #2
Sounds pretty badass to me

What cam are you running?
 

R.J.

Member
Aug 20, 2003
813
0
16
Warwick, Rhode Island
Jun 3, 2006
#3
  • Jun 3, 2006
  • #3
Try resetting your idle like this:

Begin with a cold vehicle. The idea here is to get the car to a firm cold idle with enough air bleed capacity left in the idle circuit for IAC adjustment.

The idle stop should be set first. Back out the idle stop screw, away from the bell crank arm, until about 1/2 turn past the point where it no longer makes contact (blade fully closed). Using a 0.010" feeler gauge, tighten until gauge just drags between screw and bell crank arm. Remove feeler gauge. Tighten screw exactly 1 1/2 turns. If the screw is very loose, put a drop of loc-tite or silicone on it, so it doesn't work out of adjustment.

Now remove the connector to the Idle Air Controller (IAC) just on the other side of the throttle body. Start the car and allow vehicle to warm for 2 minutes. Give a small "blip" to let it settle. If it is having a hard time staying running you may have to get an assistant until you can get to the front of the car. Now open or close the air bleed screw (CCW opens) next to the IAC until the car idles at 575 to 600 rpm. For guys with aftermarket cams and an EEC tuner, you might want to idle a bit more briskly, say 650 to 675.

Obviously, this rpm range is by what the car and driver wants...IE, no set idle speed, whatever works for YOU.

Turn off the car. Now count the number of turns clockwise to close on the idle air bleed screw. If it falls between 1/2 and 2, it's okay, now reverse it out the same number of turns. Log the number somewhere in case you need it for the future. Reconnect the IAC. You are done.

If the air bleed screw is above 2 turns, it's a good idea to tighten the idle stop screw another 1/2 turn, and then repeat the idle setting. If it is below 1/2 turn, then loosen the idle stop screw by 1/4 to 1/2 a turn, and repeat the idle setting. Be sure to put another drop of silicone RTV on the stop screw if it was disturbed. Reconnect the IAC. You are done.
 
9

95mustang_gt

New Member
Mar 30, 2005
364
1
0
Wisconsin
Jun 4, 2006
#4
  • Jun 4, 2006
  • #4
1TallMF said:
Sounds pretty badass to me

What cam are you running?
Click to expand...


Its a trickflow stage 1 cam.

I pulled codes yesterday for koer and i got these

136-HEGO sensor circuit indicates system lean (Right HEGO)
172-HEGO sensor circuit indicates lean
332-Insufficient EGR flow
412-Cannot control RPM during KOER high RPM check

I did a search and read post about taking the hose off the FPR and putting my finger on top of it to see if the rpm would change,i did it and nothing happen to the rpms.Good or bad?

R.J i will try that today ,thanks for the info.


thanks
Jesse
 

1TallMF

New Member
Apr 17, 2006
955
1
0
Montreal
Jun 4, 2006
#5
  • Jun 4, 2006
  • #5
Did the rpm's change when you pulled the vac. line off of the regulator? Putting your finger on the regulator nipple when the line is off won't do anything. the rpm's should change if you put your finger on the end of the vaccume line, but that doesn't really tell you anything, just that you're blocking a vaccume leak. See if you can get a hold of a proper fuel pressure tester and post your results. Good luck
 

drakesdad

Member
Jul 29, 2005
961
0
16
Oregon OHIO
Jun 4, 2006
#6
  • Jun 4, 2006
  • #6
Jesse, that is an awesome cam but it creates havoc with our EEC.....are you having any stalling issues with the aode....?
Will
 
9

95mustang_gt

New Member
Mar 30, 2005
364
1
0
Wisconsin
Jun 4, 2006
#7
  • Jun 4, 2006
  • #7
drakesdad said:
Jesse, that is an awesome cam but it creates havoc with our EEC.....are you having any stalling issues with the aode....?
Will
Click to expand...

Sometimes when i start it up it will idle and then die.I have to keep the idle up and then it will idle on its own.But today it didnt stall at all.I drove it around town today and didnt have any stalling problems,but i still have the rough idle problems,it feels like i have a big cam in it.

I forgot to mention that the idle is surging also.When the car is on the needle for the battery gauge is boucing around.When driving around I can feel it bucking when accelerating.

Jesse
 

drakesdad

Member
Jul 29, 2005
961
0
16
Oregon OHIO
Jun 5, 2006
#8
  • Jun 5, 2006
  • #8
same symtoms I had before the tune with a chip...
 
9

95mustang_gt

New Member
Mar 30, 2005
364
1
0
Wisconsin
Jun 5, 2006
#9
  • Jun 5, 2006
  • #9
i check vacuum it was steady 15 then change to 16 then went down to 13.It then went 15 again.It must be a vacuum leak then?If it was the valvetrain would the needle be going crazy?How can i check vacuum for the valvetrain.

Jesse
 
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