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You are watching: F150 high idle at startup


When I start my truck in the cold mornings it revs to high and takes to long to come down.Right off hits around 1600 -1800 rpm. then progressively backs dvery own.Is tright here a method rotate dvery own the high begin idle ?
My 91 5.0 has actually done the same thing since I bought it in 1991. It"s normal for mine. Cold startup it will certainly idle at 1800 for about 10 seconds once it"s around 40F outside. Then it slowly starts to idle reduced. FWIW, I additionally do not have any torque converter lockup till the coolant temp hits around 170F- E4OD. Per dealer back in the 90"s, it"s normal too.

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My 91 5.0 has done the same thing because I bought it in 1991. It"s normal for mine. Cold startup it will idle at 1800 for about 10 seconds as soon as it"s about 40F external. Then it progressively starts to idle lower. FWIW, I also carry out not have actually any torque converter lockup until the coolant temp hits about 170F- E4OD. Per dealer earlier in the 90"s, it"s normal also.
My 1990 is the exact same method hi idle until it warms upYours op is a 1996 that has a MAS.I don"t think our old(er) broncos have actually MASSent from my E6810 utilizing Tapatalk

Fuel Injection Technical Library » Idle Air Bypass (IAB)Throttle Position Sensor (TPS) Synopsis & Testing by Seattle FSB following is a list of automobile symptoms which have been associated through the TPS, but have the right to also be pertained to various other vehicle components. Check engine light, Stalls, quits, hesitation/stumble, quick idle
; To minimize the replacement of excellent components, be advised that the adhering to non-EEC areas may be the issue: Excessive blow-by, PCV malfunction, Vacuum leaks, Fuel pressure, Throttle sticking or affiliation binding. The adhering to is a list of vehicle symptoms which have actually been connected with the TPS, however can likewise be related to various other car components.• Check engine light• Stalls/quits• Hesitation/stumble• Quick idleMANY VOLTMETERS WILL AUTOMATICALLY CHANGE RANGES WHEN MEASURING TPS OUTPUT FROM IDLE TO WOT. WHEN A VOLTMETER IS USED TO MEASURE TPS OUTPUT FROM IDLE TO WOT, THE METER SCALES OR CHANGES RANGES AUTOMATICALLY. THERE MAY BE AN ERRONEOUS METER DISPLAY UNTIL THE VOLTMETER HAS LOCKED TO THE APPROPRIATE VOLTAGE READING. THE ERRONEOUS METER DISPLAY DOES NOT REPRESENT A DEFECTIVE TPS. NOTE: IT IS RECOMMENDED THAT THE "RANGE LOCK" FEATURE ON MANY METERS BE SET FOR CHECKING TPS VOLTAGE..."Upper instance is by Ford.One way to execute a quick examine is to grab a vacuum gauge. Bring the engine to normal operating temperature. Connect gauge to the intake manifold tee. BEWARE OF FAN, BELT, PULLEYS & HIT ENGINE. The vacuum gauge should review in between 15 and 22 in-Hg depending on the engine problem and also the altitude at which the test is perdeveloped. SUBTRACT ONE INCH FROM THE SPECIFIED READING FOR EVERY 1,000 FEET OF ELEVATION ABOVE SEA LEVEL.The reading should be fairly steady. .When engine is promptly accelerated (dotted needle), needle will drop to a low (not to zero) analysis. When throttle is suddenly released, the needle will certainly snap ago as much as a higher than normal number.When vacuum leaks are shown, search out and also correct the problem. Excess air leaking into the system will certainly upcollection the fuel mixture and also reason conditions such as rough idle, lacking on acceleration, or shed valves. If the leak exists in an accessory unit, such as the power brake, the unit will certainly not function correctly. Or Air Conditioning when in MAX mode may switch to Defrost.•