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A vacuum leak in the intake manifold of a 2000 Ford F150 4x4 with a 4.6L engine and automatic transmission can cause a range of symptoms, including:
Rough idle: A vacuum leak can cause the engine to run rough at idle, which may be especially noticeable when stopped at a red light or stop sign.
Misfires: The engine may misfire or hesitate under load, such as when accelerating or climbing a hill.
Poor fuel economy: A vacuum leak can cause the engine to run lean, which can result in decreased fuel economy.
Check engine light: A vacuum leak can trigger a check engine light, which may indicate a code related to the engine's fuel system.
Stalling: In some cases, a vacuum leak can cause the engine to stall or die, especially at idle or when coming to a stop.
Hissing sound: A vacuum leak may cause a hissing sound to be audible from the engine compartment, especially if the leak is large or near the intake manifold.
If you suspect a vacuum leak, it's important to have it diagnosed and repaired as soon as possible, as it can cause damage to other engine components over time if left untreated. A mechanic can perform a smoke test or other diagnostic procedures to locate the source of the leak and repair it as needed.
If Service/Check Light On Have Computer Scanned For Codes
Have Exhaust System Checked For Obstruction
Have Fuel Delivery System Function Checked--Don't Forget Fuel Filter.
How does it idle in park , does it run ruff or smooth? Are any lights lit on the dash , check engine etc. ? Could have a partially plugged IAC air passage .idle air control (IAC) valve ! The engine computer uses the IAC to control idle , when under a load such as when put into gear the computer raises the idle ! It does this by allowing more air to by pass the closed throttle into the engine raising the idle ! If these air passages clog they restrict the air flow an cause a idle problem ! Now if it runs ruff at idle in park you could have vacuum leak ! Rough Idle How to Fix Ford Taurus Engine Stalls at Stop Signs
If you ever replaced the IAC solenoid, maybe it is sticking they are known for that. You should be able to keep it running with your foot on the gas though. Check to see if the check engine light is on. If so, you will have to get it scanned for codes. You could have a fuel problem or an MAF sensor issue. Also, if the intake gaskets on this motor getting hard, it will cause a vacuum leak. When the gaskets leak you will usually get a check engine light and a rough idle.
Hello! Most probable cause is a leak in the vacuum line or broken elbow connection to the Positive Crankcase Ventilation (PCV) valve...Check PCV and its vacuum line...Send results...
does it start and run at idle in park.
it is probably either a vacuum leak or an idle air control valve,
if it misses and runs rough before it dies maybe a vacuum leak.
if it just idles too low, the iac valve
Hello, Very common concern with the Explorer, Explorer Sport Trac and Ranger with the 4.0l SOHC engine! The upper and lower intake manifold gaskets fail, causing vacuum leaks..It can be Extremely difficult to detect these leaks, because they only leak intermittently (usually in the AM after a cold soak)... As the engine warms up they seal back up! Sometimes the vehicle will idle rough, surge or stall after initial start up, then the symptoms will clear after it gets to operating temperature... Usually there will be no driveability symptoms at all, except the engine light coming on and setting lean codes.. The gaskets have been redesigned to correct this concern..
Bill Andrade Ford Master Technician/ASE Master Technician
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