Timing marks?

Very unlikely. If your vehicle is rapidly decreasing in speed you may have a brake dragging issue going on here. Make sure your rear brakes are properly adjusted.

You need to open the front cover-check the belt maybe it snapped, then find the bolt-your valve/ignition timing is off it will never start-you need to put it in TDC compression stroke-line up the cam and crank sprockets and making sure the rotor is pointing to the no.1 tower on the cap. Before you reinstall the belt and then retime the ignition.

HTH Good LUck

Hi there,

Sorry to say this, but yes. Honda's will bend valves if a timing belt breaks, It is unusual for any piston damage to occur, but they will bend valves and crack valve guides. Best practice is to replace the belt and do a compression test to prove any damage has occurred.

Mark (mhpautos)

This is a very lengthy job, to explain it step by step would take a long time. Your best bet would be to download or purchase a service manual that will have exact torque specs and pictures/diagrams for you while you work on the car!

The only speciality tools needed would be a honda crankshaft pulley holder and a torque wrench.

I can only imagine that the rocker gear is different, if the belt has slipped you will have done engine damage, bent valves will be your next concern.

Mark (mhpautos)

IT depends on the emission specs for your car but at 60K or 90K but no later as it is an inereference engine and you can wipe out the valves and cylinder head.

If you don't know where the timimg belt is located DON'T even think about changing it. Specail tools and special knowledge apply. Let a pro do it. Good luck

Depends on what mileage check they performed.

Maybe - try putting the engine on TDC on no.1 compression stroke. Make sure the timing pulley marks are all line up. Open up the distributor cap is the rotor exactly under the no. 1 cap tower.

I would check the car for rotation of the distributor as the crankshaft is rotated slightly. Got movement of the distributor as well then I would check the spark on the engine. I suspect you may have finished off a sensor or a coil or the like. But see if you have spark to the plugs.

The SH4 twin carburetted engine is few and far in between. Mechanic who are well versed in SH4 twin carburetted engine is few and far in between and it is not surprising that you are not able to find any who can help you.

There are not too many vacuum lines so it should not be a problem but I don't have any vacuum lines diagram so if you could show me some pictures, I might be able to help.

The vacuum component that affects the idming speed would be the Fast Idle Up Control for A/C. This is straightforward. Just ensure the vacuum hose to the solenoid is not reversedly attached. Reversing would result in the vacuum pump not releasing when the solenoid is turned off. Ensure the idle-up adjust screw is not pushing against the throttle when A/C is not turned on.

The component most likely to cause high idling would be the automatic thermal choke mechanism. Ensure the hoses to the thermal unit are not clogged and the choke lever is fully released when engine is at operating temperature. Ensure the thermostat is working and you have one that has not been removed.