Stalls at idle?

Hi mustangsam,

If the idling speed is high and the clutch pedal is released slowly on level ground with brakes released, the engine might not stall and would move forward.

When releasing if the vehicle is not moving forward and releasing of clutch does not cause the engine to stall, then the clutch or drive trains is bad.

it is a 1988 honda prelude and when i start it up it idles fine but after a while when idleing when it gets warm it dies and even when i start it back up it wont stay idleing it will die unless i keep it idleing.

what do you think could be the problem

i had the same problem a few weeks ago and i got tired of trying to find the solution and since i am not using my a/c i pulled the air box out from the right side fender and all the extra hoses and i haven't had any problem since

my dual carb 1.8 runs great it doesn't like to maintain an idle when FIRST started up...after a minute or two no problem or on further start ups...JIm

Hi Jim,

If you depress the accelerator once and release before starting, does the engine runs well at initial startup?

Thank you for responding. Yes the car will idle if i floor it for one second before starting. The car will stall out upon further throttle movement. So if i step on it for one second and start it it will idle (a bit high) if i just drive away without stopping for a few minutes all is well.
Thyank you for your time

Jim

The problem is caused by a stuck or misadjusted throttle opener. When this happens, the throttle is not opened when engine is stopped and this would not allow the autochoke to come into action unless you have depressed the accelerator at least once.. Start engine and run till operating temp and with engine running, disconnect the throttle opener vacumn hose ( blue arrow ) and plug it. Engine idling should incrase to at least 1500 rpm, if it does not, adjust the throttle opener adjustment screw till the desired rpm is achieved. Vacumn test the throttle opener diaphragm for leakages.

THANK YOU ever so much. i was going to look in the choke area ( if i could find it!!) i see the part in your picture (thanks again) so i will try your fix in a few days or next week. i am a student studying automotive technology at contra costa college in san pablo CA not much attention to carbs so your input is great and i believe most likely the problem. could this also cause a stumble of rpm's when using the brakes like coming to a stop and holding the brake down??

Any way thank you so much again Brau

You are welcomed.

No, the stumbling when holding the brakes should be a vacumn leak associated with the brake booster.

In between the brake master cylinder and booster there is a seal and when this seal is bad, holding the brakes would cause vacumn leaks and the engine to stumble.

Remove the master cylinder holding nuts ( hydraulic pipes need not be disconnected if space is available ) and slowly pull the master cylinder sufficiently to enable you to get at the seal.

Honda prelude 1.8 dualcarb manual 1985

A couple of days ago I changed the water pump and the thermostat already armed, it turns on well but after 1 minute it throws gasoline through an air duct of the carburetor and the engine turns off someone knows what happens?

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Cheers, Ken