Question about 1999 Pontiac Sunfire

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Car has trouble starting in warm weather

My car starts fine when it is cold outside, but when it is warm it is hard to start.

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  • Johnny
    Johnny Mar 24, 2014

    No codes. It mostly happens when it is warm outside. The engine does not have to be warm for this to happen. I have replaced the gas cap, and plugs and wires. Thank you for your input.

  • Denis Houle
    Denis Houle Mar 25, 2014

    before starting scan data of temp. sensor if it out of range

  • Denis Houle
    Denis Houle Mar 25, 2014

    whatever the outside temp . the temp sensor should match outside temp example if outside is 30 c then the temp sensor should be near 30c

  • Johnny
    Johnny Apr 07, 2014

    I checked the temp, it matched with outside temperature. No fault code.

  • Denis Houle
    Denis Houle Apr 08, 2014

    clean trottle body plate with combustion chamber then change spark plugs and fuel filter see how it goes

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  • Pontiac Master
  • 1,250 Answers

Scan data if engine temp. is normal if ok see if there is engine faulty code.
hope it helps

Posted on Mar 24, 2014

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  • 2 Answers

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Posted on Jan 02, 2017

leetamara
  • 702 Answers

SOURCE: will not start when engine warm

Sounds more like your ignition module is getting hot and not working. I'd go there first before replacing the ECM. You can remove the ignition module and most NAPA stores have the ability to test them for you. Make sure they test it at least 5 times. This way it'll simulate starting and stopping.

Posted on Jul 23, 2008

  • 46 Answers

SOURCE: 95 Pontiac Grand Am Won't Start in Cold

yes...first...how old is the battery?? you have 3 options...the battery is bad, the alternator is bad, or the serpentine belt is bad...most auto parts stores will check your battery for free while it is in the car....otherwise take it out and bring it in to have them check it...

Posted on Jan 15, 2009

  • 1 Answer

SOURCE: 97 firebird formula hard to cold start

Check the cold start injector useing a digital multimeter with a bar graph. Unplug the injector wires and insert the probes into the wiring plug, crank the engine and the bar graph should pulse if it does remove the injector and with the wiring reconnected and the injector held over a suitable container crank the engine and observe the spray pattern. If insufficient replace injector. This should be a starting point at least

Posted on Jun 05, 2009

  • 158 Answers

SOURCE: 1997 grand am i replace the power steering hose

Please check the fluid level in the power steering pump. After putting on a new hose the fluid may have traveled through the system and you may need more fluid.

Posted on Oct 02, 2009

  • 1 Answer

SOURCE: i have a 2007 pontiac grand prix gxp with remote

It is a default setting in the vehicles computer. When the remote start is activated it only enables the engine and the accessories are on standby until the key is inserted. As of now I am not sure of a change to this default setting.

Posted on Jan 16, 2010

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