Idle Speed Control Check

Pvelasquez · #1 (**permalink**) 05-28-09, 09:31 PM

I purchased a FSM for a 1995 Eldorado, I am having a problem interpreting a statement relating to Idle Speed Control Check. In the decision tree it states “Record TPS Min Value” my value is -1.5. Later on it states “Record TPS Max Value” which is 14 then “subtract TPS min value from TPS max value and record ISC authority”

When you subtract a negative value from a positive value, basically you should change the negative -1.5 to a positive 1.5 and add it to the 14, does anyone believe that is what should be done or is the negative sign included in with the 1.5 meant to mean subtract this from the other?
Would like to pass emissions on this my second test (free) .

Thanks for any help from anyone

Raze · #2 (**permalink**) 05-29-09, 10:27 AM

what codes you got? a new TPS is under $30 new at autozone...

Pvelasquez · #3 (**permalink**) 05-29-09, 12:15 PM

I have already replaced the TPS and have cleaned the Throttle Body, I get a code "P030 (E030) ISC RPM out of range" and it is intermittent. The FSM states that I need to adjust the plunger on the Idle Speed Control Motor, and fall into the range of 10 to 11 when subtracting TPS min value from the TPS max value.

thanks for the reply

**Ranger** · #4 (**permalink**) 05-29-09, 12:59 PM

Quote:

The FSM states that I need to adjust the plunger on the Idle Speed Control Motor

Press on the plunger. It should retract. When it bottoms out, unplug it. Now adjust the gap to .060. It is adjusted.

Raze · #5 (**permalink**) 05-29-09, 03:19 PM

yeah, there should have been a little writeup in the box w/the sensor on how to do it, otherwise there's the procedure in the FSM...

Pvelasquez · #6 (**permalink**) 06-01-09, 01:28 PM

Thanks for the help - after it is adjusted the FSM states that you need to perform the "Learn Procedure" I have made the adjustments and my mileage seems to be improving - if any one needs the info on the learn procedure for a 95 eldo I will type it in.

**Ranger** · #7 (**permalink**) 06-01-09, 05:11 PM

It may already be in the Tech Tips section. If not, put it there.

PeTe1 · #8 (**permalink**) 10-27-09, 10:54 PM

ok i got a new iac valve and need to adjust it

can any one put up some details on how to put it the 0.06 spec and how to relearn it any info would be of great help !

**Ranger** · #9 (**permalink**) 10-27-09, 11:01 PM

Wait a minute. The IAC "valve" was used on the '96 or '97 and later. Before that they used the ISC "motor". Which do you have? If you have the ISC motor, see post #4.

PeTe1 · #10 (**permalink**) 10-28-09, 02:04 AM

sorry about that i have a 1996 deville with a 4.6l i have read post #4 and im not sure what i have to gap the plunger to the Throttle Body or the plunger to the valve body im just not sure what gap needs to be adjusted !

**Ranger** · #11 (**permalink**) 10-28-09, 05:13 PM

Gap the plunger to the throttle lever.