Question about 2002 GMC Yukon XL

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Yukon wont start

2001 yukon xl stalling for 3 weeks now wont start replaced plugs & wires , air filter , gas pump , & relay, clean injectors , still wont start please give me some ideas. i gave up and can not aford to take it to dealer.

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  • tandrick Aug 21, 2008

    how do i check if truck is firing . when i pull gas line gas spray out of it so i guest pressure is ok.RPM guage does not move when engine is spinning. p.s. thanks so far for the fast reply.

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Ok. sounds like you have already replaced the most likely suspects, but let me ask you a few questions to see if I can help you. When you try to start the vehicle is it firing? Do you have fuel pressure getting to the injectors? O.K. this next question will sound a little strange, but it will tell me if the computer control system is working. When you try to crank the vehicle, does the RPM guage move at all while engine is spinning? Let me know the answers and I will try to help you.

Posted on Aug 21, 2008

  • Jonathan Dawson Aug 21, 2008

    Ok. you may not need to c/k to see if it is firing, because the rpm guage is not moving, this tells me that the vehicle is not getting any signal from the crankshaft position sensor to allow it to fire. There could be two reasons for this. 1 would be that the crankshaft position sensor is bad. (it is located behind the starter, so you would have to remove the starter to replace it...it has 3 wires comming from it.) 2 the vehicle anti-theft system has shut the vehicle down....to check for this problem simply watch the dash lights while you spin the vehicle over... If the "Theft" or "Security" light is flashing, then it is the security system that has shut the vehicle down. If this is not the case, then the crankshaft position sensor is probibly bad. You can replace the sensor, but if you do, it will probably still not start because a computer will be needed to re-learn the Crankshaft Position sensor varaition. Hope this helps......One more thought, if it turns out to be the security system, you will still need a factory scan tool to override it.

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Fill the tank with High Test, Add some dry gas and a good fuel system cleaner or 2 or 3 and this should dissolve all the gunk and clean the injectors! Read & follow the cans' instruction carefully.
If this cures the problem never let your gas tank get below 1/4 and especially never run it to empty as this is when the gunk and/or water will enter the system!
Hope this helps!
Good Luck!
jackiaria
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