Off topic ..trouble with another Ford.plz help!!

MUSTANGJOE

Silver Stanger

Founding Member

Apr 9, 2002

1,644

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59

Nov 27, 2006

#1

• Nov 27, 2006

• #1

:OT:

Hey guys..

Im having a problem with my winter truck. Its a 99 F-150 V6. Its ideling very funny. Its stays at about a line lower than 1000 rpm then every 3 seconds the idle drops to about 4 lines lower than the 1000 rpm mark then back to its regular position!!

What can this be? I tried cleaning the IAC but it still does it. Could it be the MAF or the TPS?

Thanks.

p.s- sorry its not stang related

 

Az Pete

10 Year Member

Mar 30, 2005

711

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49

Panama City, Fl.

Nov 27, 2006

#2

• Nov 27, 2006

• #2

http://www.ford-trucks.com/forums/index.php

Try looking here. Had lots of luck with this site.

 

MUSTANGJOE

Silver Stanger

Founding Member

Apr 9, 2002

1,644

17

59

Nov 27, 2006

#3

• Nov 27, 2006

• #3

Az Pete said:

http://www.ford-trucks.com/forums/index.php

Try looking here. Had lots of luck with this site.

Click to expand...

Thanks..I just registered .looks good!!

 

DTNODYA

Member

Dec 15, 2005

831

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16

Nov 27, 2006

#4

• Nov 27, 2006

• #4

After you cleaned your IAC, did you disconnect your battery so that the computer could reset? If not, I'd do that first. FWIW, I was having a similar issue with my 2000 Mazda B4000 (Ford Ranger XLT) and I cleaned the MAF a few times with electrical cleaner ... didn't notice a difference. Then a friend of mine gave me a can of MAF cleaner and after I used it, no more idle issues. Weird I know ....

Reset your batt first tho' if you haven't .........

 

MUSTANGJOE

Silver Stanger

Founding Member

Apr 9, 2002

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Nov 29, 2006

#5

• Nov 29, 2006

• #5

Thanks for the replys guys...

I was driving the truck today and my feet were cold so I switched the heater know to the floor position only and the surging went away..lol.

I usually keep it at the defrost setting for the windowshield. everytime I put it back at defrost the bad idling comes back/

Im guessing its a vacum leak?

 

Mike97gt

it doe snot

Founding Member

Jan 26, 1999

10,633

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the people's republic of massachusetts

Nov 29, 2006

#6

• Nov 29, 2006

• #6

MUSTANGJOE said:

Thanks for the replys guys...

I was driving the truck today and my feet were cold so I switched the heater know to the floor position only and the surging went away..lol.

I usually keep it at the defrost setting for the windowshield. everytime I put it back at defrost the bad idling comes back/

Im guessing its a vacum leak?

Click to expand...

The problem is that the A/C system is short cycling because it's low on freeon, so it will idle badly in the A/C and in the defrost positions. The A/C compresor runs in the A/C and in the defrost positions. When the A/C short cycles the computer can not adjust the idle fast enough so it starts to surge.

There is two ways to fix this.

1. Fix the A/C system leak and have the system recharged

2. unplug the low side cycling switch to disable the compresor.

 

M

MBDiagMan

Member

Sep 22, 2006

171

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Lamar County, Texas

Nov 30, 2006

#7

• Nov 30, 2006

• #7

Good diagnosis! You beat me to it.

 

Mike97gt

it doe snot

Founding Member

Jan 26, 1999

10,633

7

89

the people's republic of massachusetts

Dec 1, 2006

#8

• Dec 1, 2006

• #8

MBDiagMan said:

Good diagnosis! You beat me to it.

Click to expand...

Thanks

 

MUSTANGJOE

Silver Stanger

Founding Member

Apr 9, 2002

1,644

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Dec 3, 2006

#9

• Dec 3, 2006

• #9

svttech76 said:

The problem is that the A/C system is short cycling because it's low on freeon, so it will idle badly in the A/C and in the defrost positions. The A/C compresor runs in the A/C and in the defrost positions. When the A/C short cycles the computer can not adjust the idle fast enough so it starts to surge.

There is two ways to fix this.

1. Fix the A/C system leak and have the system recharged

2. unplug the low side cycling switch to disable the compresor.

Click to expand...

Thanks...were is the side cycling switch?