Question about 2004 Ford F150

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Something turns on and off when parked and it drops the rpm

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It sounds like your A/C compressor is cycling. Try turning your climate control to OFF and see if it stops.

Posted on Apr 05, 2011

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Posted on Jan 02, 2017

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I have a 2005 Ford mustang v6 model. When in park on idle with the air on the car vibrates. Is this a normal action or is something wrong.


When using the a/c it puts a load on the vehicle, and a drop in the rpm(revolutions per minute) is normal. If the vibration does not stop when to accelerate or at hiway speeds then something is amiss - otherwise it is normal!!

Jun 12, 2015 | Ford Cars & Trucks

1 Answer

Toyota corolla hatch 2002 idle at 2000 rpm when


All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.

Sep 17, 2014 | Cars & Trucks

1 Answer

1995 chevy silverado cl1500: high idle @ 1800 rpm: replaced all sensors, some twice.


check all vacuum lines very closely for a vacuum leak. might be a small hairline crack that is hard to see.

Dec 04, 2013 | Chevrolet Cars & Trucks

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Loud idle running hot in park but not in drive


double posted
post RPM in both modes,
it must be the same
the ISC idle controls system controls idle at all times.
post RPM. 800 is normal. the exact valve is in the FSM
and posted under the hood in USA.
no country stated in 4000s posts so.... well, gee....
here, open the hood, look up, see EPA vacuum map
that is also the the engine size and type , and most state the normal
hot RPM clearly there, and is in the FSM.

here is the acid test. hot.
in park hot, rpm 800 if not the ISC fuction is dead
"idle speed controls"
good? yes.
then select drive. if RPM drops ISC is malfing.
now back to park. (all this is in the FSM to read)
now 800 hot. you turn on all heavy electrical loads
the rpm does not drop. Head lights + heater fan, and defrost.
all these test he ISC, if it fails its bad.
what does bad mean, that means its out of control
and you do further testing to find the reasons.

vast reasons.
Ill name 3:
intake air leaks. aka vacuum leaks.
ISC valve dirty , clean it.
throttle cables , misadjusted.
cold start air valve stuck open hot.





Nov 25, 2013 | 2006 Jeep Grand Cherokee

1 Answer

2009 Audi A4 loud engine startup sound & shake


probly need new motor mounts--also a dirty throttlbody can hav the same effect--u can cleanit with a nonchlorinatd solution

Oct 31, 2013 | Audi A4 Cars & Trucks

1 Answer

Rpm drops in 1995 jeep grand cherokee laredo


Does it change if you put it in neutral at a stop?

Jun 18, 2013 | 1995 Jeep Grand Cherokee

1 Answer

Steering wheel vibration during parking the car


Hello and welcome to FixYa!

When parking the car, do you feel the vibration when the steering if fully turned? If it's fully turned then it's just normal.

The car tends to vibrate when the wheel is fully turned. Sometimes you'll notice that the rpm drops too which is just normal.

Hope this helps and thank you for using FixYa! Have a good one!

May 07, 2011 | 2010 Mazda CX-9

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