EFI Idle problem- idles too high

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EFI Idle problem- idles too high - surging

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Ford Forums >> Ford Trucks, Ford Vans & Ford SUV's >> Ford F-150 >> EFI Idle problem- idles too high - surging

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EFI Idle problem- idles too high - surging - 4/26/2005 12:04:59 PM

87Mojo

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Joined: 4/26/2005
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I have an 87 F150 with 302 and EFI. I have a problem with the idle. Sometimes it idles normally a little below 1000 RPM's but often after driving awhile it idles too high- up around 1500-2000 and sometimes I have an idle surge. if I turn the car off for awhile it idle normals normal again. I replaced the little cylindrical valve on the intake- idle control solenoid I believe- and it didn't help. Whay else to check? Could it be the O2 sensor?

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RE: EFI Idle problem- idles too high - surging - 4/26/2005 1:02:04 PM

cctxfish

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You may want to plug all vaccum line going out of the intake manifold, check your problem is gone. Then start reattaching the lines to find your problem source, then troble shoot from there. good luck

(in reply to 87Mojo)

Post #: 2

RE: EFI Idle problem- idles too high - surging - 4/26/2005 5:26:36 PM

skip

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read the OBD and see what comes out. yes vacum would be my first guess(you can use a can of carb cleaner or unlit propane and spray around all hoses and conections). then i would also check the power stearing pressure switch

(in reply to 87Mojo)

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RE: EFI Idle problem- idles too high - surging - 1/3/2008 7:50:10 PM

greuelc

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I was just wandering if you found the problem because i have a 1991 with the 5.8l that does the same thing.

(in reply to skip)

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RE: EFI Idle problem- idles too high - surging - 1/4/2008 12:26:32 PM

oldtimer35

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You might look at the base of the upper intake. The gaskets there has a tendency to get blown out. Get a flashlight and look under the umbrella of the intake. If you see any gasket material sticking out, then the gasket is blown.

(in reply to greuelc)

Post #: 5