Question about 2008 Hummer H3

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My 2008 hummer cranks but won't start replace battery replaced fuel pu,p and fuel pump relay I can unplug fuel harness and then it starts any other suggestions

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

seans46
  • 161 Answers

SOURCE: 2005 Hummer H2 battery went down and when I

if it is the factory alarm you will have to do a relearn. G.M. uses a couple different ways to do the relearn and I would think it would be the same for hummer. turn off all acc and then turn the key to the on position wait 10 minutes you will see the light on the dash flash and go out . asap turn the key to off to on 3 times quickly and the third time leave it on on again do this 3 times for 30 minutes then after the final turning of the key 3 times on the 4th time start the car. so turn off all acc like radio , a/c ect then turn key to on in 10 minutes the light on dash will flash and go out quickly turn key from off to on 3 times and once again leave on on do that 3x for 30 minutes then start the car. that is the gm relearn for security they have one on some models that start after 10 minutes but that is usualy on the cheaper cars so just do the 30 minute.

Posted on Jun 04, 2009

  • 15 Answers

SOURCE: 2008 Hummer occasionally will not start.

It's unlikely that such a new vehicle would have a starter or solenoid problem. If it cranks over but won't start, try jiggling the shifter while in Park, or put it in Neutral. It could be a defective Starter Safety Switch which prevents the car from being started while in gear. Good luck.

Posted on Oct 07, 2009

  • 10865 Answers

SOURCE: hummer h2 won't start- all power comes on

Also check to be sure it is in park. It could also be the key switch. Look in the yellow pages under autoelectric and take it to a shop where a specially trained tech with proper diagnostic tools can isolate and repair your problem.

Posted on Oct 15, 2009

  • 474 Answers

SOURCE: hummer H3 (2008) does not start and error message

your anti theft is activated. consualt owners manual

Posted on Nov 28, 2009

  • 20 Answers

SOURCE: how do you replace a fuel pump on a 2003 h2

You have to drop the gas tank. The fuel pump is located inside.

Posted on Jul 02, 2010

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I would buy a fuel pump relay for that particular car. If that relay that you switched with the wiper relay isn't the same exact one then the fuel pump will not work properly. Make sure the right relay is in there. Could also be a clogged fuel filter.

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I would check it first. The computer grounds the relay for 3 seconds when you crank the engine to boost fuel pressure. Once the engine starts the pump is powered only if you have oil pressure.

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hi,

watch your oil pressure when cranking, you have to have some oil pressure to get the fuel system to start. you may have to find the hot wire at the relay and energize it to see if it is indeed the fuel pump going out. if its been sitting and its a 97 the fuel pump just might have went, you can also try hitting the gas tank from the outside in the middle to see if that works too. have a water hose or fire extinguisher around when your working on fuel system and leave one of your battery cable a little loose..

jm

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Are the spark plugs getting spark when it fails to start ?
Are you getting injector pulse from the computer ?
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2008 h2 won't start


Most overlooked cause for this concern is an extremely dirty factory (not aftermarket) air filter. Remove the factory air filter and blow out the debris still inside the box so the engine doesn't **** it in. Make sure all the air box tube clamps are tight and the MAF sensor is still plugged in good. Then try to start it without the air filter in. If it still does the same thing, unplug the MAF sensor and try to restart. If it starts only after the MAF was unplugged then you need a MAF sensor. Check these things and let me know what happens.
I hope this info helps!~subyguru~

May 07, 2012 | 2008 Hummer H2

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2004 z71 tahoe when the gas gauge is at a quarter of a tank it won't crank. It acts like it is empty with gas.


Check your fuel filter if it needs replacement. Empty it out then connect it back. Try to start it again. Inspect the fuel filter if it filled with gasoline. Check if there is noise at the fuel tank to check if the pump is working. If it did not, inspect the fuse for your fuel pump and the relay. If both are good you may connect the fuel pump directly to the battery to see if it works. It may be a bad wiring.

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