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2001 sunfire start good cold but not when engine is hot

The car start very well when engine is cold but as soon you stop the car when hot it wont start back unless you put the pedal to the floor

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  • Cars & Trucks Master
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It sounds like you have a "flooding" problem, where you are getting too much fuel on the warm start. It takes more fuel to start a cold engine than a warm one. By holding the pedal the pedal to the floor, you are telling the computer to do a "clear flood" operation, and that lets you start the car. The culprit is probably the Coolant Temperature Sensor. If this is faulty, it will tell the computer that that the coolant (thus the engine) is much cooler than it really is. This results in the engine flooding when warm. It may also run rough at idle after warm start since it is still getting too much fuel. You will also notice a massive loss of fuel economy. Replace the coolant temperature sensor.

Posted on Jan 04, 2014

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Posted on Jan 02, 2017

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SOURCE: Engine Floods after brief start and run when cold -then shut off

Local mechanic determined engine was flooded and started it by holding throttle to the floor and cranking 5-7 seconds - then the engine sputtered to life. It has run perfectly before and since and I'm at a bit of loss to understand why this occurred this one time - so far. It's been driven now 5 days with no problems.

Posted on Nov 21, 2008

  • 1 Answer

SOURCE: wont start unless i put the gas pedal down

A new switch is more like 65-100 dollars.

Posted on Dec 25, 2008

  • 4 Answers

SOURCE: starts but dies as soon as i let off the gas wont

replace the gas filter just follow the gas line of the carb it should be easy to find

Posted on Feb 07, 2010

jturcotte
  • 8836 Answers

SOURCE: 2001 sunfire put new starter in car would not

Hi, it sounds like the starter solenoid was not wired properly. You have 2 wires at the starter, right? The bigger wire goes to the big top post on the solenoid, right? The smaller wire is called the start wire and it goes to the smaller terminal labeled "S." Is that how you wired it? You also have to be careful when tightening the nuts on the terminals that the start wire terminal does not touch the other terminals and vice versa. Do you have the starter in the car now? Can you take a picture to send me?

Posted on Apr 05, 2011

  • 1 Answer

SOURCE: The heater in my car will not work while in park

I have the same problem. When my dealer changed my coolant I now seem to have a stuck thermostat. They are denying they did it. I haven't changed the thermostat yet but that is the problem.

Posted on Apr 13, 2011

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Which engine is in your Pontiac? 2.2 or 2.4 ?
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