EVERYTIME I TURN MY A/C ON MY TRUCK THE RPM GOES UP AND DOWN IS IT THE THROTTLE POSITION SENSOR?

2005 Ford F-150

Tiny

Abel Talamantes

August, 8, 2012 AT 12:35 AM

The rpm goes up and down like it wants to die

8 Answers

Tiny

ASEMaster6371

August, 8, 2012 AT 12:58 AM

Most likely not. Look for any vacuum leaks first. If all ok, I would look at the iac motor. It may be bad.

Roy

Tiny

Abel Talamantes

August, 8, 2012 AT 1:00 AM

Where exactly could I look for leaks sorry im not good with engines. Is it in the intake?

Tiny

ASEMaster6371

August, 8, 2012 AT 1:11 AM

Yes, along the intake manifold. You may need some help if you are not familiar with this operation

Roy

Tiny

Abel Talamantes

August, 8, 2012 AT 1:14 AM

What would replacing the throttle position do?

Tiny

mhpautos

August, 8, 2012 AT 1:37 AM

First check to see if the A/C is cycling as fast as the speed variation, if it is only doing it in conjunction with the A/C on I doubt that it will be a faulty IAC.

Tiny

salvadormendoza

August, 8, 2012 AT 6:52 PM

This also hapen when u or I turn off my engine of 2002 f150 and turn on like hour later rpm needle goes up and down like for a 4 minutes look s like normal because I take the truck to cervise they never find enithing in my opinion this us nothing to worry about hope this help

Tiny

M_H_RITZEL

August, 17, 2012 AT 2:31 PM

Sounds like the throttle body sensor, Under normal conditions when the engine is running each time the air conditioning kicks on there will be a drop in idle speed. This is caused by the extra strain on the engine. When the compressor shuts off then it should be normal. As far as the reving up, have found that the position sensor can make the truck do that.

Tiny

Abel Talamantes

August, 18, 2012 AT 6:08 PM

So it isn't the throttle position sensor than? Or could it be the vacuum that's dirty because when I trurn the ac on and the Rpm goes up and Down. Then I step on it on park or neutral the truck dies.

Please login or register to post a reply.

Vacuum Leak Test and Repair - All Cars
Clean Idle Air Control Ford Super Duty 5.4L
Easily Clean Your Throttle Bore Like a Pro
Code Read Retrieval/Clear Scion XD