Question about 2003 Hummer H2

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My hummer has hard start when it's turned off for ashort period,

My 2003 Hummer H2 has a hard start 4-6 turn of the engine, I notice only when its bin driving then you turn it off for say 10 min to an hour it will have a hard start. However in the morning the car starts up great or when it's bin sitting not driving it starts right up. It's a temp thing. My mechanic say I should change the tem control sensor. What do you think the car is not over heating

Posted by maurice62133 on

  • Marvin
    Marvin May 11, 2010

    has a fual pump pressure leak down test been performed?

  • Robert Wood
    Robert Wood Aug 16, 2017

    If the check valve was leaking in the pump it would not start good in the mornings after setting all night .

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1 Answer

Robert Wood

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  • Hummer Master
  • 6,092 Answers

A scan tool should be able to read the temp pids at operating temperature to see if they are "off" enough to cause problems . Check for fuel lines to close to heat sources as boiling of the fuel causing vapor lock may be happening after heat soaking .

Posted on Aug 16, 2017

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5 Related Answers

djicenova

Patrick Cowan

  • 319 Answers

SOURCE: 03 H2 HUMMER WONT START

Does your scan tool have a reset eeprom mode?

if not, try disconnecting the battery for a 30 min period, then try

Posted on Feb 27, 2009

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Anonymous

  • 2 Answers

SOURCE: service air suspension

Your airbags probably have an air leak or are just starting to crack. Go to you tube and type in Suncore hummer suspension air bag replacement. They have a whole how to install that also show your suspension and how it fails

Posted on Mar 13, 2009

Anonymous

  • 2 Answers

SOURCE: 2006 H3 Hummer AC/Heater Fan Motor

I brought my 2006 H3 in to the dealer for the same thing. My blower stopped working all together but it started as an intermittent problem. He said he had to replaced a diode or resistor either behind the switch on the dash that controls the fan or on the fan motor itself. Have not had a problem since but that was only about 4 months ago.

Posted on Apr 09, 2009

Anonymous

  • 1 Answer

SOURCE: 2006 Hummer H3 fails to start periodically

If you look in the owner's manual it will explain this. Happened to me a bunch of times, really embarassing. It is an additional anti-theft device . If the computer senses that the key is inserted improperly, or that it is not a perfect match for the code it has in its memory for your key, it shuts of the gas supply to your engine for approx. 10 minutes to defer theft. Still happens to me intermittently. Now only very rarely. Total pain. I cleaned my key..carefully, with WD40 and after drying put just a touch of graphite on the key and started the beast a number of times. My dealer didn't read the manual either. You must wait the full ten minutes before trying to restart....otherwise it never totally resets and (the first time this happened to me) you can sit there and fight it forever.

I don't have my owner'smanual handy to refer you directly to the proper pages, but its in there under theft deterent. Hope this helps......and that Hummer can provide aneasy fix for this.

Posted on Jul 21, 2009

Anonymous

  • 1 Answer

SOURCE: rear output shaft seal on transfer case

How to remove axle shaft seal on hummer H2

Posted on Dec 13, 2009

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If you mean that the engine cranks over for 6 seconds before it fires up, that sounds like a fuel situation. You would need to install a fuel pressure gauge and turn the engine off for several minutes and see if pressure drops. The pump has a check valve that keeps the fuel line pressurized until you start the engine again, if that valve is bleeding off pressure it takes longer for the pump to prime the fuel system, hence your long crank. Could also be a regulator or fuel injector bleeding pressure. Good luck!

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Does your scan tool have a reset eeprom mode?

if not, try disconnecting the battery for a 30 min period, then try

Feb 27, 2009 | 2003 Hummer H2

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Service air suspension


Your airbags probably have an air leak or are just starting to crack. Go to you tube and type in Suncore hummer suspension air bag replacement. They have a whole how to install that also show your suspension and how it fails

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When I turn the switch I hear a single click and that is it. No engine turning over. While trying to start with key the headlights go out. Out of ideas, Will take to Chevy garage in am. Will post solution.

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