idle problems help

notch351

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Jul 30, 2010

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Mar 24, 2011

#1

• Mar 24, 2011

• #1

I bought a 94 5.0 and the previous owner installed afox throttle body swap to car. othe than that is just has your basic exhust edlebrock intake and other simple mods. the car surges at idle when you first start it for a min. then once driven for amin seems fine. I know these 94-95 stangs are tricky have checked for the norm stuff vaccum leaks exc. note the car also has one of those adjustable iac plates on it. any help would very much like to fix issue. the car has no chip or anything tune wise.

 

RIO5.0

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Mar 25, 2011

#2

• Mar 25, 2011

• #2

Try this link... its worked on mine. Id recommend all the steps if you never set the idle or TPS voltage. My Fox swap has been problem free on the idle and such and your mods shouldn't be doing jack to hurt it or throw things off.

The Corral

 

earleys94gt

Active Member

Aug 31, 2003

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Ashley, Ohio

Mar 25, 2011

#3

• Mar 25, 2011

• #3

A cam would affect the idle alot more than the throttle body would.

Check out the link above, because the issue sounds like something minor the previous owner just overlooked.

 

notch351

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Jul 30, 2010

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Mar 26, 2011

#4

• Mar 26, 2011

• #4

I did do the tps when i first bought the car, but I guess it is probably off now from me trying to mess with that stupid adjustable iac. I did also try to remove that and once i removed that peice the car wouldn't hold an idle at all every time i would put in the clutch and come to a stop the car would die so i put the adjustable plate back on and been trying to deal with it ever since. the car also has the egr removed but i did by that little plug in sensor that sends the single to the computer the the egr is operating normal. so I guess i will try to check the tps again to see where its at. thanks

 

RIO5.0

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Mar 26, 2011

#5

• Mar 26, 2011

• #5

Been there had that...clutch in, it dies. Check the voltage then do the other steps...odds are the TPS is fine..I find they very rarely move once set.

Clutch in and it stall is more in the later portion of the reset...it needs to learn to idle with a load on it. Do you have a stock IAC to throw on in place of the adj one???

 

notch351

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Jul 30, 2010

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Mar 26, 2011

#6

• Mar 26, 2011

• #6

yeah the stock one is still on the car the adj plate goes in between the throttle body and the iac. it has 2 set screws you use to adjust the air through the iac. was gonna double check the tps and take off the adjustable plate for iac and try to reset idle.

 

notch351

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Jul 30, 2010

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Mar 27, 2011

#7

• Mar 27, 2011

• #7

so i removed that iac plate went through the steps - the tps adj and it seems to be doing better. idle a little high but i am sure the tps needs a little adj because i had it loos to set it and my buddy didn't bring over his multi meter so i did process with out. let you know how it is once i reset the tps

 

notch351

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Jul 30, 2010

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Mar 29, 2011

#8

• Mar 29, 2011

• #8

well after trying to reset the idle i am concerned my problem has something to do with the egr being deleted and the trouble code not being cleared and bypassed with a delete selinoid to trick the computer

 

RIO5.0

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Mar 30, 2011

#9

• Mar 30, 2011

• #9

That blows... EGR/smog been gone on mine forever and no issues like yours I just have the plunger set 1/2 way and secured ???

 

notch351

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Mar 31, 2011

#10

• Mar 31, 2011

• #10

yeah but my egr is gone completely.

 

notch351

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Mar 31, 2011

#11

• Mar 31, 2011

• #11

one thing with the smog being gone how do you eliminate that from throwing the engine light or do you have to get a tune to resolve that

 

RIO5.0

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Apr 1, 2011

#12

• Apr 1, 2011

• #12

Mines gone as well along with the smog tubes to the back of the heads...everything....As I mentioned....you set the EGR plunger 1/2 way & secure...puter see's all is fine...never had a CEL.
You have a sensor that plugs into the factory EGR plug that does the same I guess??

 

notch351

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Apr 1, 2011

#13

• Apr 1, 2011

• #13

correct

 

BlackVert

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Apr 2, 2011

#14

• Apr 2, 2011

• #14

i seem to remember that usually indicates a rich condition. the computer usually tries to make is richer for a little while after starting.

does it do that both when cold and hot?

did you clean the mass air meter sensor?

is the timing set at 10*?

perhaps the coolant temp sensor has gone bad?

 

notch351

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Jul 30, 2010

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Apr 2, 2011

#15

• Apr 2, 2011

• #15

it only does it on cold start up. have cleaned maf and also put new one on just to ck. timing is set at 14 degrees. haven't check the temp sensor. guess i could reference ohms and ck it. and i do beleive the computer is making the car run rich for that brief time