Question about 1988 Ford F 150

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Throttle stuck truck will not idle down - 1988 Ford F 150

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Check your spring on the throttle body if thats not it try changing the throttle cable

Posted on Dec 10, 2009

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Truck idles very high (even after sitting for awhile). Any way to get it down?


How long since a tune-up? Are there any applicable trouble codes? Where applicable, make sure throttle linkage isn't holding the throttle open. Clean the throttle body and iac.
If you have a scanner that shows live engine data, you can look at idle and idle desired, If idle desired is close to normal, then the pcm knows the idle is too high and trying to compensate. In that case, check for stuck iac or vacuum leak. There could be other issues?

May 15, 2016 | 2003 Chevrolet Silverado 1500

1 Answer

1997 Saturn SL-1 idles fast


The ECM maybe stuck, disconnect the battery and wait 5 mins then reconnect.

Other things that normal cause high rpm at idle:
  • PCV hose to throttle body has a leak
  • vacuum line to brake has a leak.
  • the throttle plate maybe dirty and is open partly
  • the IAC is bad. Which is on the throttle body.
  • the throttle plate sensor is bad, just unplug it and see if the rpm goes down. If it does, replace the sensor.
  • the egr value maybe stuck
  • bad front o2 sensor
  • bad coolant senor. You should have this replace since the original sensor where plastic tip and crack. The new ones has a brass tip. the transmission and air( IAT) have the same sensor part.

May 11, 2014 | Saturn SL Cars & Trucks

1 Answer

99 Chrysler Town and Country idles high


Maybe a sticking choke or binding throttle linkage. Have you lifted the aircleaner cover and looked down carb opening? Choke stuck?
Could be a simple idle speed adjustment also. What rpm's do consider to be high. Maybe some carb cleaner down the barrels and throttle linkage could free it up. Again, it could be a simple idle adjustment depending on RPM's it's turning.

Apr 05, 2013 | Chrysler Town and Country Cars & Trucks

1 Answer

What Makes a 1990 cutlass calasis idle fast.


Could be a dirty or stuck throttle plate, faulty idle air control valve, or a large vac leak.
The computer controls the idle speed by regulating the amount of air entering the throttle body thru the control valve.

Jan 31, 2013 | Oldsmobile Cutlass Calais Cars & Trucks

1 Answer

3.8L BUICK REGAL IDLE WONT KICK DOWN IN PARK OR IN GEAR CHECKED VACCUM LINES & INTAKE GASKET 4 LEAKS ALL LOOKS GOOD ANY SUGGESSTIONS


If you know for a fact you have no vac leaks, the next step would be to check the idle air control valve. It should be mounted in the throttle body. It could be stuck open.
The computer controls idle speed by regulating air flow into the throttle body.
The throttle plate could also be stuck open. An eighth of an inch would do it. Make sure the throttle and cruise control cables are not pulling on the throttle plate.
Vac leaks could include the PCV valve and the EGR valve.

Jan 12, 2013 | 1995 Buick Regal

1 Answer

It wont idle down to the proper rpms


The most common causes for this is either a stuck idle air control or a vacuum leak. The idle air control is in the throttle body and adjusts the amount of air that the engine gets at idle.

May 09, 2011 | Isuzu Pickup Cars & Trucks

2 Answers

1996 Ford Thunderbird V8 4.6L Idles High. When starting up engines does not idle down after warming up. When driving car just wants to speed up.


check your throttle body make sure all the springs are connected. your throttle body may be nasty inside and may need cleaning, it may be getting stuck. Throttle cable could be sticking or disconnected (there are two one pulls and one returns to idle IIRC)

also you should really search www.tccoa.com and become a member there if you are not already.

Oct 10, 2009 | 1996 Ford Thunderbird LX

1 Answer

Idle too fast at 2300 rpm


Yes your choke is sticking

Jul 09, 2009 | 1996 Isuzu Trooper

1 Answer

2003 impala stuck accelerator..


THE TROTTLE PLATE INSIDE THE THROTTLE BODY WILL GET DIRTY AND THE IDLE WILL NOT COME DOWN TO NORMAL.U CAN CLEAN IT W/ A THROTTLE BODY CLEANER U CAN BUY AT ANY PARTS STORE

May 15, 2009 | 2003 Chevrolet Impala

1 Answer

Extremely high idle speeds develped overnight


check idle speed control make your throttle valves not stuck.check for vacuum leak around the throttle body area look for broke gasket.

Apr 13, 2009 | 1987 Ford Ranger

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