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Sometimes it can be as simple as looking for a hose to that has come off or a broken fitting. This can be done by isolating different areas in the system.
If the above fails you need to measure the vacuum with a vacuum gauge. While the truck is running or how fast the vacuum dissipates when the engine is shut down. Then you use a MityVac (small hand held vac pump) to measure the different areas where the vacuum is supplied and fix the leak when you find it.
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∙ 12y ago
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How do you find a vacuum leak on a 99 Ford Excort ZX2 that cuts out while idling?
i would try a can of ether pray all vacuum lines one a time. when it ides up then know where the leak is.
Why does my 99 suburban dies out when in reverse?
Torque converter or vacuum leak
How do you find a vacuum leak in the heater of 99 Dodge Ram?
with your mouth
How do you find a vacuum leak in an 19 99 Mercury Cougar?
how to find a vacume leak on a1999 cougar
You are having problems with your 99 escort idleing it runs fine but does not want to idle?
check the pcv valve and hoses if there is a vacuum leak here it wont idle
I have a 99 zX2 check engine light is on code is telling you that it is burning lean gas?
Good chance you have a vacuum leak somewhere. Check all your vacuum lines under the hood, look for one disconnected or cracked.
How do I find a Vacuumn leak on 99 Ford windstar?
Check all vacuum hoses and fittings 9 year old vehicle may be wise to replace all hoses one at a time You can get a vacuum pump to test vacuum operated motors under dash
In a 99 Windstar LX the heater blower is stuck in the windshield position I move the selector but nothing changes how do you fix this problem?
Could be a vacuum leak "defrost" is the default position of the system Check vacuum lines and motors under the dash
What is the speaker buzzing over the drivers window in your 99 GMC Jimmy?
I don't have a 99 GMC Jimmy
Air Conditioner on 99 dodge truck quits when you go up a hill and when get off the gas you can hear door close and air starts again?
You Have A Vacuum Problem. It Sounds As If You Push The Gas For Power You Loose Vacuum Pressure To Your A/C. You May Have A Leak In The Hose, But This Should Give A Miss In The Engine. I Truly Suggest You Search For A Vacuum Leak First, Next Let An A/C Tech Check It Out. Or Even A Good Mechanic. It Almost Has To Be A Vacuum Problem. If Anybody Can Improve On This Please Do. Thanks !!!! & Good Luck To You
Rough idle 96-99 blazer?
Could be, a bad spark plug(s), a spark plug wire(s), a bad distributor cap, a bad rotor, a vacuum leak, bad fuel injector(s).
Why does coolant leak when the engine is off on 99 grand am?
why does the coolant only leak when engine is off on my 1999 grand am?
