Idle issues

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Blakonblak94

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Jan 31, 2010

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Apr 12, 2010

#1

• Apr 12, 2010

• #1

Ok guys, so I have an issue going on. I'm running tw 170 heads, 19's, trackheat intake. Im tuning using quarterhorse. Well it seems like my lambse numbers are staying around high 11's and low 12's at idle, and my kamfr is near 1.18. Well the car has a rough idle. I'm trying to find out what to do about this. Any help?

 

final5-0

Mustang Master

Apr 6, 2003

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Apr 13, 2010

#2

• Apr 13, 2010

• #2

a sig telling about all the various combo parts helps us form a reply
that is gonna be half way close to something you can use

Grady

 

final5-0

Mustang Master

Apr 6, 2003

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Apr 14, 2010

#3

• Apr 14, 2010

• #3

Something is not making sense with what you posted

Your L's command a fat mixture
yet
Your K's say adaptive is adding fuel



You'd think you would be seeing K's below 1.00

Grady

 

BlackVert

15 Year Member

Oct 3, 2003

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Apr 14, 2010

#4

• Apr 14, 2010

• #4

lambses below 14.6 go hand in hand with kamrfs above 1.0, don't they?

seems to me it thinks it is lean and is trying to richen it up.

what maf do you have? can you tweak the maf transfer curve?

and what is your fuel pressure?

 

final5-0

Mustang Master

Apr 6, 2003

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Apr 15, 2010

#5

• Apr 15, 2010

• #5

BlackVert said:

lambses below 14.6 go hand in hand with kamrfs above 1.0, don't they?

seems to me it thinks it is lean and is trying to richen it up.

what maf do you have? can you tweak the maf transfer curve?

and what is your fuel pressure?

Click to expand...

As I see it

He said he dl's L's in the 11's and low 12's which would be the pcm
commanding a fat mixture ... would it not

Now if the pcm is commanding a fat mixture

Would you not expect to see K's at a value of below 1.00 which
means adaptive is trying to pull fuel

If he was seeing L's which were lean you would expect to see K's
above 1.00 cause adaptive is trying to add fuel to compensate
for the lean mixture which is opposite of what is happening here

anyhoo ... just a random thought

The meter's curve could be outta whack at the idle points
but
Other things could be hosing around with the idle as well

Grady

 

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Blakonblak94

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Jan 31, 2010

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Apr 18, 2010

#6

• Apr 18, 2010

• #6

Check fuel pressure today actually. It was high, set it at 39 with vac pulled. It's just getting bad. I'm thinking my o2's are going out. They are original to the best of my knowledge on a 80k mile car.

 

final5-0

Mustang Master

Apr 6, 2003

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Apr 19, 2010

#7

• Apr 19, 2010

• #7

Blakonblak94 said:

Check fuel pressure today actually. It was high, set it at 39 with vac pulled. It's just getting bad. I'm thinking my o2's are going out. They are original to the best of my knowledge on a 80k mile car.

Click to expand...

You can't be changing the fuel pressure or that will throw your
tuning outta whack

The best thing to do is put it back to stock
or
Better yet ... put your OEM regulator back on

Grady

 

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Blakonblak94

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Jan 31, 2010

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Apr 19, 2010

#8

• Apr 19, 2010

• #8

Stock is 39psi. That's where it is currently sitting. I'm just getting a tad frustrated. It's running really fat at idle. I can smell fuel, and it's running rough, almost like it has a miss. I'm thinking new o2's may be in line. I just don't know. I dont wanna dump money into troubleshooting if I can track the issue down.

 

toyman

10 Year Member

Jul 19, 2007

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Apr 20, 2010

#9

• Apr 20, 2010

• #9

I don't see any mention of you pulling fault codes from the PCM. I would do this before throwing parts on.

 

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Blakonblak94

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Jan 31, 2010

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Apr 20, 2010

#10

• Apr 20, 2010

• #10

Already checked. I had two codes that were understandable. One was vapor canister being unhooked, the other I got a 511 which is EEC permanent read only memory(Rom) test failed. Not sure what that means.

 

BlackVert

15 Year Member

Oct 3, 2003

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Apr 22, 2010

#11

• Apr 22, 2010

• #11

final5-0 said:

As I see it

He said he dl's L's in the 11's and low 12's which would be the pcm
commanding a fat mixture ... would it not

Now if the pcm is commanding a fat mixture
...

Click to expand...

maybe i'm having a senior moment ... here is what i'm thinking ...

when the O2 sensors report that the mixture is lean, the computer commands a richer LAMBSE to try to compensate. this results in an increase in the KAMRF.

am i thinking about it backwards?

 

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Blakonblak94

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Jan 31, 2010

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Apr 22, 2010

#12

• Apr 22, 2010

• #12

Not sure to be honest. This is new to me and I'm learning heavily.