So what can the problem be?
Could be more than one problem.
The oil light staying on when the engine is warmed up could be a problem with the oil pump or engine bearings.
Its possible the switch for the light is faulty.
You can replace the switch or have the oil pressure checked with a mechanical gauge at a shop.
The high idle could be several things, but I would be more concerned with the oil light.
SOURCE: Oil pressure light on at idle
Don't delay on this. Take the vehicle in and have the oil pressure sensor checked. It could be just the sensor or it could be something more serious. A drop in oil pressure could lead to catastrophic engine failure.
don
SOURCE: cold start problems with 1987 honda accord
I have an 87 accord manual carbureted with 200k miles on it and mine has done that ever since I got it. I've owned it for about four years now and the previous owner told me it happens. I have no idea what it means but the only problem I've ever had was when the alternator went out last summer (which I doubt is related but had similar symptoms).
Not a solution, more just commiseration.
SOURCE: Low Oil Pressure on 1992 Chevy 1500 Pickup Truck
1992 silverado pickup has a problem with the oil pressure Gage on the dash board fluctuate when i put break on or accelerate the gas
SOURCE: 1986 Honda Accord DX - too high idle on cold start
1986-1989 Honda Accord with Carburetor have a very bad habit that is little known even by most mechanics but easily fixed at home. The vacuum port on the choke opener that is connected to the intake manifold and both vacuum ports on the fast idle unloader get plugged up with nasty hard carbon almost as hard as metal. When this happens the choke sticks closed and the idle sticks on fast idle when the engine is cold and nobody can figure out why. All you have to do is attach a small drill bit to the end of a flexible socket-driver extension and put it in a variable speed drill that will let you run it real slow and carefully drill out the vacuum ports that are plugged. After they are nice and clean use a vacuum pump tester to make sure the choke opener and fast idle unloader are working before putting it all back together. It's amazing how much better the car runs after cleaning out those ports.
SOURCE: 89 Honda Accord Battery Light is On
The FuseLink is blown. It is a 100 AMP in-line fuse on the red wire from the alternator.
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