Honda Prelude 1989

Hi there:
I suggest check this links, according with the fuel system:
- Fig. 62: Vacuum hose routing-1989 carbureted Prelude (except California)
- Fig. 63: Vacuum hose routing-1989 carbureted Prelude (California)
- Fig. 64: Emission component schematic-1989 carbureted Prelude
- Fig. 65: Vacuum hose routing-1989 fuel injected Prelude


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My honda prelude 1989 runs speed and later it will be slow and cannot run again.

in the fuse panel under hood its marker fuel pump relay

Hi,
Sounds like your power brake Vacuum Booster has a leak. The vacuum
leak will cause the engine to lose RPM.
You should have it checked out as it will eventually start affecting your
brakes.

the reason it wont start is because of the fuel pump relay is faulty.. just run a wire from the inside of your trunk from 1 of the wires on top of the tank to ur fuse box... it will always start from now on....

Hi:
The fuel pump is mounted inside the tank. If your fuel pump isn't working, make sure you test/check your main relay first. They are prone to fail on your car, and will cause similar symptoms

Either your master or slave cylinder is leaking (if hydraulic) Replace leaking cylinder with repair kit and blead the system. More serious it could be a problem on the clutch assembly.

check for vacumm leaks or disconnected vacuumm hoses around the in take manifold!

I had the same problem on a Rover. There was a leak in inlet manifold that was caussing the problem.
To verify, spray some sealant to temporarily seal the inlet manifold .and the eratic idling should disappear for some time.
If it does, you know there is leak in inlet manifold which you can take of and refit with a new gasket.

do you have any holes in floor board? is it a raw fuel smell or exhaust?