koumiss45

My 4.6 sohc (96) has recently came up with a little problem. Sometimes when I pull up to a stop my engine will not come down from 1500 rpm's, even when I am on the clutch. It also seems as if I step (hard) on the brake it will cause the idle to lower, other times this problem is non existant. WHAT IS MY PROBLEM????? It is driving me up a wall. I think it could be a vacume leak, but I dont know where from. And I cant hear it sucking. Another thing is my ABS light comes on once in a while, could these two be related such as in a brake booster? Just a thought. Thanks for any help.

rbstang

OK 1st thing is probably IAC

OK 2nd thing is normal. When you step on the brake hard your rpm will lower because your drawing power from the motor.

OK 3rd thing your probably low on brake fluid or your abs sensors are damage.

Thats my guess.

koumiss45

Thanks... could you tell me where exactly the IAC is located on this motor, 2nd, Yeah I am a dumbass that is so true, 3rd, Its on level now since I've had it, but I am not sure about the previous owner. Appreciate the help.

rbstang

unbolt those 2 bolts, get some intake/carb cleaner and spray it in the hole.

Jglisson

unbolt those two bolts and replace it...cleaning it will make it worse more than likely.

I have a used one I can sell you...3k miles on it since new.

rbstang

i cleaned mine works better..

koumiss45

First thing, what will you sell me one for( shipped to missouri) 2nd thing is I've heard that it will improve it for a while but then it will go out. Thanks, I'm not ?'ing you expertise here just asking for clarification. You obviously know more than me on this subject.

rbstang

1st try and clean it then if that doesnt work ya go ahead and replace it.

96GTmustang_man

I had the same problem with my IAC. I sprayed it with carb cleaner, and it cleared it right up.

n/a_threat

Is your a/c running at the time? Remember the compressor will play with the rpms.