a/c problem

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Jul 20, 2006 | 07:28 PM

fordman1000

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a/c problem

I have a 97 4.2 f150 the a/c works perfect but causes the truck to miss or hesitate ..with a/c off runs fine..friend told me i need to re-flash the computer..rather a dealer needs to..any ideas me and my wallet would appreciate it

Jul 20, 2006 | 08:25 PM

Racerguy

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From: BC, Canada

Hi and welcome to the forum

Does the problem only happen at idle or when driving it too?
Does it idle ok with the A/C off?
How many miles on the spark plugs and fuel filter?

Jul 21, 2006 | 05:42 AM

fordman1000

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the problem is more noticable when driving and especially at constant speed..I did notice the idle doesnt change when I turn a/c on and off. All of the basics have been changed...plugs,filters,etc. If i was to descibe how it feels when driving its almost like the clutch is slipping,,even though its new..p.sp thanks for your response

Jul 21, 2006 | 11:30 AM

LxMan1

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From: Louisville,Ky.

Is it low on charge causing the compressor to short cycle on and off?

Jul 21, 2006 | 12:42 PM

fordman1000

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no the a/c charge is fine

Jul 24, 2006 | 08:33 PM

Blackbeauty97

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I had a car where the a/c compressor was going. I don't know if it was a clutch or a bearing??? However, it would kind of lock up and cause the engine / power to surge.
Do you hear any squeels/ rattles???

Jul 25, 2006 | 06:42 AM

fordman1000

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thanks for the response,its much more pronounced than a compressor cycling..but to answer the question ,no it doesnt make any kind of noise and it stays on while running..the whole truck stutters when it happens like I said before it feels like a strong miss ..I think it might be in the PCM or the IAC but those are my best quesses

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Jul 26, 2006 | 05:28 PM

Blackbeauty97

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Well, on the old cars....when the a/c was turned on a solenoid was used to increase the throttle.

Your probably on the right track with the computer. I'm not too sure what sensors are on there but a bad sensor could be a problem.

Looking in a electrical schematic from a Haynes manual.
There is a "Powertrain Module";a/c clutch cycling pressure switch;a/c pressure cutoff switch....to name a few...
I'm not an expert, but maybe "Google" those parts and see if they would play a part in your problem?