Question about 1990 Ford F150

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I have 1990 ford f150 5.8 liter it idles high when in park and idles about 1200 rpm when in gear and sometimes surges up and down. i have clean the idle control and check showing 12.5 ohms still won&#

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Stephen

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  • Ford Master
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One common problem is a vac leak or a sticking throttle plate.
The computer controls idle speed by how much air is allowed into the intake. The idle control valve could be sticking even tho you have cleaned it, or have a faulty motor.

Posted on Sep 14, 2012

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5 Related Answers

Anonymous

  • 72 Answers

SOURCE: ford freestar, idle is wierd,

try a tune up

Posted on Jun 11, 2009

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Anonymous

  • 7 Answers

SOURCE: 2000 ford expedition ,,rough idle in park..rough

Check the fuel pressure at the rail assembly, there should be a min of 40 lbs at the rails. Do you have any loss of power under a load? You may have an issue with your o2 sensor that is causing the ecm to send an improper signal to the engine ign/fuel map.

Posted on Dec 07, 2010

honeymokey

honeymokey

  • 3113 Answers

SOURCE: Our 2001 ford focus when it idles it surges

Check the pcv hose for leaks at the intake manifold. Common problem.

Posted on Jan 23, 2010

Scott

  • 420 Answers

SOURCE: 2001 FORD F150 ENGINE SURGES AND DIES AT IDLE

Check all of your vacume lines. If it isn't a vacume line it is most likely the O2 sensor.

Posted on Apr 16, 2009

Anonymous

  • 8 Answers

SOURCE: my 1990 ford ranger has a 4.0 liter 6 in it after

vacume problems..

Posted on Nov 09, 2009

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My sirion 2003 the idle speed not steady some times 1000 rpm 1100rpm some times 1200 rpm and not going down . When i remove the battery cable and reconnect it the idle speed become normal but only for few...


Did you clean or replace the iac valve?? If so,start inspecting all vacuum hoses & fittings,gaskets and components that operate off of vacuum.If you cant locate a leak visually, connect a 1' long piece of rubber hose to the valve on a small,handheld propane torch.Open the valve slightly so propane comes out,start the engine and let it idle then run the hose across all of the components listed above.If the engine idle surges upwards,the component you just passed over has a leak.
A defective tps can also cause a high or flucuating idle.

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The F 150 depending on the engine has a MAP sensor if the sensor vacuum get disconnected or even if the sensor fails the result is black smoke.RPM jumnping up and down look for a vaccum hose that is disconnected or broken.

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To be honest no idea with my head under the bonnet and having a play to see whats wrong ,could be anything from a vacumn pipe to faulty sensor .

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Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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