A/C want kick up idle on my '88 Mark VII

If the iac needs cleaning then it wouldn't idle up when the motor is
cold. And it does that fine.


On Fri, 12 Aug 2005 14:24:29 -0500, "Sharon K.Cooke"
wrote:

>Mach 1 wrote:
>>
>> Anyone know what could be the reason why when I turn on my A/C it dont
>> kick up the idle?
>>
>> Thanks
>
>IAC valve needs cleaning.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

"Mach 1" wrote in message

> Anyone know what could be the reason why when I turn on my A/C it dont
> kick up the idle?
>
> Thanks

88...hmmm Is that CFI? Does it have an idle kicker motor? You say it idles
a little higher when cold? Could be the ECU dosent know the ac is on, it is
also possible that it doesnt care....Maybe you should post what engine, fuel
injection type for us....might help.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

Mach 1 wrote in
@4ax.com:

> Anyone know what could be the reason why when I turn on my A/C it dont
> kick up the idle?
>
> Thanks


Maybe we're getting it wrong.

If it didnt "kick up" the idle, the rev's would drop.

If they stay the same it's working.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

I suppose it would help to tell about the motor.

Its a 5.O HO EFI just like the Mustangs. It is the speed density also.
No mass air sensor. They have the EEC IIV computer in them.

Anyway the thing idles up when its cold like it should. So that tells
me the iac is working. Im sure theres some sensor that is supposed to
tell the iac to bring up the idle when the A/C comes on.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

Mach 1 wrote in
4ax.com:

> I suppose it would help to tell about the motor.
>
> Its a 5.O HO EFI just like the Mustangs. It is the speed density also.
> No mass air sensor. They have the EEC IIV computer in them.
>
> Anyway the thing idles up when its cold like it should. So that tells
> me the iac is working. Im sure theres some sensor that is supposed to
> tell the iac to bring up the idle when the A/C comes on.
>

Does the idle stay the same or does it drop?

Just answer that.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

"Mach 1" wrote in message

>I suppose it would help to tell about the motor.
>
> Its a 5.O HO EFI just like the Mustangs. It is the speed density also.
> No mass air sensor. They have the EEC IIV computer in them.
>
> Anyway the thing idles up when its cold like it should. So that tells
> me the iac is working. Im sure theres some sensor that is supposed to
> tell the iac to bring up the idle when the A/C comes on.

If it has idle problems, clean throttle bore and IAC. Then take it for a
ride so it can re-learn to its new, clean self. Normally (on newer vehicles)
the computer actually controlls the AC compressor, I kind of doubt it on the
eeeK 3 though, the AC compressor probably sends the 12v sig to the ECM. It
should keep the idle steady when the AC is on, it's put in drive or rev, hit
the cig lighter, ect. not really "kick it up" .
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

>>
>
>Does the idle stay the same or does it drop?
>
>Just answer that.

It drops after about 15 seconds or so. Always has on first startup.

But when I hit the A/C button the idle dont kickup so in turn the idle
is to low due to the extra drag of the compressor. Its got to be a
signal not getting back to the EEC.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

Mach 1 wrote:
>
> >>
> >
> >Does the idle stay the same or does it drop?
> >
> >Just answer that.
>
> It drops after about 15 seconds or so. Always has on first startup.
>
> But when I hit the A/C button the idle dont kickup so in turn the idle
> is to low due to the extra drag of the compressor. Its got to be a
> signal not getting back to the EEC.

Try disconnecting the IAC valve input and then start the AC. If the RPM then
drops or the engine dies, then the IACV is obviously working.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

Humm.....not a bad idea. God I dread trying it. Its so dang HOT
outside.


On Mon, 15 Aug 2005 07:44:12 -0500, "Sharon K.Cooke"
wrote:

>Mach 1 wrote:
>>
>> >>
>> >
>> >Does the idle stay the same or does it drop?
>> >
>> >Just answer that.
>>
>> It drops after about 15 seconds or so. Always has on first startup.
>>
>> But when I hit the A/C button the idle dont kickup so in turn the idle
>> is to low due to the extra drag of the compressor. Its got to be a
>> signal not getting back to the EEC.
>
>Try disconnecting the IAC valve input and then start the AC. If the RPM then
>drops or the engine dies, then the IACV is obviously working.
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

Aaargghh! I dont understand this whole thing!

The 88 is full EECIV. On ANY I've ever owned or seen the idle stays
constant A/C clutch on or off! It's a V8 so it should be about 600-650 RPM

I think our friend is used to carb type "kickers"

"Shoe Salesman" wrote in


>
> "Mach 1" wrote in message
>
>>I suppose it would help to tell about the motor.
>>
>> Its a 5.O HO EFI just like the Mustangs. It is the speed density
>> also. No mass air sensor. They have the EEC IIV computer in them.
>>
>> Anyway the thing idles up when its cold like it should. So that tells
>> me the iac is working. Im sure theres some sensor that is supposed to
>> tell the iac to bring up the idle when the A/C comes on.
>
> If it has idle problems, clean throttle bore and IAC. Then take it for
> a ride so it can re-learn to its new, clean self. Normally (on newer
> vehicles) the computer actually controlls the AC compressor, I kind of
> doubt it on the eeeK 3 though, the AC compressor probably sends the
> 12v sig to the ECM. It should keep the idle steady when the AC is on,
> it's put in drive or rev, hit the cig lighter, ect. not really "kick
> it up" .
>
>
>
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

"Backyard Mechanic" wrote in message

> Aaargghh! I dont understand this whole thing!
>
> The 88 is full EECIV. On ANY I've ever owned or seen the idle stays
> constant A/C clutch on or off! It's a V8 so it should be about 600-650
> RPM

I think you are dead on backyard.

Just so Mach 1 knows, you can generate a code during the KOER test by
leaving the AC ON during the test. The test wants you to turn off the AC.
If you leave it on during the test it will set a code for seeing the AC on.
That is how you could check to see if it knows when the AC is on. BTW, if it
sees a idle control problem it will set a code for that too. Also, clean the
throttle bore so your minimum air is correct again.

Does the car have a real drivability problem?
Not sure...

Is the horse dead yet?
I think so.....
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

No drivability problems except I have not been using the A/C afraid
that the motor will die in traffic.

I didnt get a chance to try anything yesterday. You have a good point
about starting tests while A/C is on.
Fortunatly I have a complete emmissions book from Helms which is good
for tracking down defective sensors.

I did spray carb cleaner into the intake right at the butterfly and
also into the iac port. Im thinking I will take iac completely off and
do a more though cleaning.

I read that a map sensor could be at fault also. Possibly some vacumn
hoses leaking too.

And its possibile the idle rpm is just to low to begin with.


On Tue, 16 Aug 2005 06:52:04 GMT, "Shoe Salesman"
wrote:

>
>"Backyard Mechanic" wrote in message
>
>> Aaargghh! I dont understand this whole thing!
>>
>> The 88 is full EECIV. On ANY I've ever owned or seen the idle stays
>> constant A/C clutch on or off! It's a V8 so it should be about 600-650
>> RPM
>
>I think you are dead on backyard.
>
> Just so Mach 1 knows, you can generate a code during the KOER test by
>leaving the AC ON during the test. The test wants you to turn off the AC.
>If you leave it on during the test it will set a code for seeing the AC on.
>That is how you could check to see if it knows when the AC is on. BTW, if it
>sees a idle control problem it will set a code for that too. Also, clean the
>throttle bore so your minimum air is correct again.
>
>Does the car have a real drivability problem?
>Not sure...
>
>Is the horse dead yet?
>I think so.....
>
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII 

"Mach 1" wrote in message

> No drivability problems except I have not been using the A/C afraid
> that the motor will die in traffic.
>
> I didnt get a chance to try anything yesterday. You have a good point
> about starting tests while A/C is on.
> Fortunatly I have a complete emmissions book from Helms which is good
> for tracking down defective sensors.
>
> I did spray carb cleaner into the intake right at the butterfly and
> also into the iac port. Im thinking I will take iac completely off and
> do a more though cleaning.
>
> I read that a map sensor could be at fault also. Possibly some vacumn
> hoses leaking too.
>
> And its possibile the idle rpm is just to low to begin with.

Yes, it could be too low because the throttle bore is dirty. If no one has
messed with the idle screw it will be back to normal. There is most likely a
minimum air procedure to set it by the book, follow it closely if so. But I
would first clean the IAC and bore well. Then drive it with the air on for a
while and see what it does. If it dies at first give it a chance for a few
stop and goes. If it keeps dieing, set the minimum air. If it still dies I
would replace the IAC. You could skip to the last step (replace IAC) and it
will probably fix it. Since you have the book it would be good to follow it
by symptom (low/erratic idle or something similar), try to understand WHY
you are doing each step,that way it will teach you allot about EEC4 Fords-
that's for sure. It kind of amazing really, if you follow the steps exactly
in the book, the car will diagnose itself.
Good luck
 >> Stay informed about: A/C want kick up idle on my '88 Mark VII