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You are watching: F150 high idle at startup


When I start my van in the cold mornings it revs come high and also takes to lengthy to come down.Right turn off hits about 1600 -1800 rpm. Then progressively backs down.Is there a way turn down the high begin idle ?
My 91 5.0 has done the exact same thing due to the fact that I bought the in 1991. It"s normal for mine. Cold startup it will certainly idle at 1800 for around 10 seconds as soon as it"s about 40F outside. Then it slowly starts come idle lower. FWIW, I also do not have any type of torque converter lockup until the coolant temp hits about 170F- E4OD. Every dealer ago in the 90"s, it"s typical too.

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My 91 5.0 has done the exact same thing because I bought the in 1991. It"s regular for mine. Cold startup it will certainly idle at 1800 for about 10 seconds when it"s around 40F outside. Then it slowly starts to idle lower. FWIW, I additionally do no have any kind of torque converter lockup till the coolant temp hits about 170F- E4OD. Every dealer earlier in the 90"s, it"s common too.
My 1990 is the same way hi idle until it warms upYours op is a 1996 that has a MAS.I don"t think our old(er) broncos have MASSent from mine E6810 making use of Tapatalk

Fuel Injection technical Library » Idle wait Bypass (IAB)Throttle position Sensor (TPS) synopsis & experimentation by Seattle FSB following is a list of automobile symptoms which have actually been linked with the TPS, however can additionally be pertained to other automobile components. Examine engine light, Stalls, quits, hesitation/stumble, quick idle
; To minimize the instead of of great components, be advised the the adhering to non-EEC areas may it is in the issue: excessive blow-by, PCV malfunction, Vacuum leaks, Fuel pressure, throttle sticking or affiliation binding. The complying with is a perform of car symptoms which have been connected with the TPS, but can additionally be concerned other automobile components.• inspect engine light• Stalls/quits• Hesitation/stumble• fast idleMANY VOLTMETERS will AUTOMATICALLY change RANGES as soon as MEASURING TPS calculation FROM IDLE to WOT. As soon as A VOLTMETER IS offered TO measure up TPS output FROM IDLE to WOT, THE METER scale OR transforms RANGES AUTOMATICALLY. THERE might BE one ERRONEOUS METER display screen UNTIL THE VOLTMETER has LOCKED to THE proper VOLTAGE READING. THE ERRONEOUS METER screen DOES NOT stand for A DEFECTIVE TPS. NOTE: that IS RECOMMENDED that THE "RANGE LOCK" function ON plenty of METERS BE collection FOR check TPS VOLTAGE..."Upper situation is by Ford.One method to perform a quick examine is to grab a vacuum gauge. Carry the engine to normal operating temperature. Attach gauge to the entry manifold tee. BEWARE the FAN, BELT, PULLEYS & fight ENGINE. The vacuum gauge must read between 15 and 22 in-Hg depending upon the engine condition and the altitude at which the check is performed. SUBTRACT ONE inch FROM THE SPECIFIED reading FOR EVERY 1,000 FEET of ELEVATION over SEA LEVEL.The reading should be quite steady. .When engine is rapidly increased (dotted needle), needle will drop to a short (not come zero) reading. As soon as throttle is unexpectedly released, the needle will certainly snap back up come a greater than regular figure.When vacuum leaks are indicated, find out and also correct the condition. Excess wait leaking right into the mechanism will upset the fuel mixture and cause conditions such as unstable idle, lacking on acceleration, or shed valves. If the leak exists in an accessory unit, such as the strength brake, the unit will certainly not duty correctly. Or wait Conditioning when in MAX mode may switch come Defrost.•