1

Sometimes my car will not start the first time. I press throttle all the way down then turn the key on but no start how to I start an older car with an automatic choke?

  • Welcome to Motor Vehicle Maintenance & Repair! Could you please add the year/make/model/engine of the vehicle in question? – Pᴀᴜʟsᴛᴇʀ2 Mar 6 '19 at 17:03
  • Depending on the temp of the engine how many times you need to stomp the gas pedal to properly prime the engine. – Moab Mar 8 '19 at 21:25
2

An automatic choke is just a bimetallic spring. When the temperature gets cold enough the spring will pull the choke closed.

There are two catches here. The first is that while the spring will put pressure on the choke to close it, it doesn't actually close until pressing the gas pedal at least once. Rapidly pressing and then letting go of the pedal spays in fuel using the accelerator pump and allows the choke to close. The choke won't close on its own because the choke is also tied to the high RPM cam. The cam raises the idle speed while the engine is cold. The cam can only move while the throttle is pressed.

The second is that you can't hold the throttle all the way down because the choke pull off will open the choke. This mode is meant to clear a flood condition.

The standard procedure is to rapidly press the pedal once or twice, let go of the pedal then turn the key to crank.

| improve this answer | |
  • That's how I've always done it. A couple of quick stabs at the pedal and off you go. – Tim Nevins Mar 6 '19 at 20:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.