Will not drop down from fast idle when first started
When i first start my 1995 ford e-150 van in the morning. the car will not come off fast idle. it just keep on fast idling. if i drive the van, it just keeps getting faster. the engine does not adjust back to a normal idle. i hate to drive it, its ******* the transmission and brakes.
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When you had the pump replaced did anyone look at the rod and main bearings? 99% of all low oil pressure problems I've seen has been directly related to bearing wear, not a bad oil pump. Replacing the pump will give you slightly better pressure temporarily but that won't last very long. Verify the actual oil pressure using an external mechanical gauge. If it's low (likely it is) go back into the oil pan and use plasti-gage on the bearings to measure clearances. In reality though, in an engine with that many miles, it's best to either completely rebuild or replace it though.
Check the base plate gasket under the throttle body, some time the gasket start to leak, and will cause a high idle, if possible with engine running get some water and pore it at the base of the throttle bode, you will hear a suction sound, that's the gasket, replace it.
i had a van do this same thing to a tee turned out to be a broken key pin in the harmonic balencer causing the timing to ****** replaced balencer and ran like a dream there is a crank sensor grid on the balencer when the key pin broke it trew the timing off
Checking for vacuum leaks is good place to start since air is still used for regulation in the engine. You must check all of them. Check the fast idle control valve. It may be dirty or the vacuum hose are disconnected or has a hole or tear. Check as well loose wires or corroded ones since the sensors may not be working correctly due to electrical issues.