Question about 2000 Chevrolet Blazer

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Just stopped running at 65 mph, has good battery , all lights work ,turns over feels like no spark or fuel , is it a timming belt or chain ? and ideas where to start?

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  • javnray2001 May 25, 2009

    i have spark , i added some fuel to the throttle body and she started but soon stalled it appears to me a fuel pump .

  • javnray2001 May 25, 2009

    what is VAT and where is the fuel disable switch located? the fuel pump fuse is a square grey box how do you check that ? it only runs when you dump fuel in the carb.when i turn the key on i can hear the pump humm and when i turn it off it clicks . so it is getting contact?

  • javnray2001 May 25, 2009

    where do i plug in the fuel psi tester , i looked at the tbi there are two silver lines going into it about three inches from the fire wall on has a black plastic over that screws on is that the hook point for the tester?

  • rjdadio
    rjdadio May 11, 2010

    Ignition module or coil, what engine?

  • rjdadio
    rjdadio May 11, 2010

    Your problem is most likely the ignition coil or ign module. What engine? -Daddio



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Ok,i need more info,lights work a]could you test your battery to see if it good probably 11.7 to 12.1 volts,you will need a voltmeter.b]when you crank it, you need to verify for sure if it has spark,feel like no spark or feeling no gas does not help,pull out a spark plug boot from the spark plug,insert a small screwdriver and keep the screwdriver metal 1/4 away from any good ground and then crank it,if you have spark you need to check for fuel,rent a fuel pressure gauge at autoparts store and check for fuel pressure and give us those numbers,if you do not have spark and fuel probably you need to change the ignition module,or ignition switch,but if you have spark andyou have fuel you need to check with a scanner the status of the crankshaft sensor to see if it recieving volts .let me know when you have some numbers,if for some reason you can not perform these test leave alone and pay a mechanic ,it does not worth it that you get hurt trying fixing something dangerous.keep me post it.

Posted on May 24, 2009

  • abf65 May 25, 2009

    hi,try to rent at autozone a fuel pressure test tool,you need to pay like 40.00 or 50.00 but when you take back the tool they give you reinbursment,so it is free the tool loan in autozone,you can try any other autopart but make sure is gonna be free the loan.with the tool is gonna be easy to diagnose,insert the pressforure hose in the fuel rail valve stem test,turn ing.on should go all the way 40 to 50 psi,crank the engine and should down 8 to 10 ps probably 35 to 45 psi,if it is below that before you change your 300.00 + dlls.fuel pump,check for bad fuses,specially the ones for ecm,ecm1,ing,fuel,eng.fuses,and fuel relay.if you have good fuses,check fuel pump for juice,probably you have 3 wires,one should be 12 vots,thats the main,2 wire 2to 4 volts thats your fuel gauge and 3 should be the ground.if you have close to 12 volts at the fuel pump harnness,try to find a couple friends because you need to drop your fuel case your going to do the job let me know so i can point you how to do it right and safe.good luck

  • abf65 May 25, 2009

    ok,you have a fuel fuse electronic,you can replace it for a regular square one 15 or 20 gauge read the gray square one to see how gauge is rated it,those fuse last forever because they reactivate it after cool down,probably the fuse is good because you hear the fuel pump,now,if you here the fuel pump it does not mean that it is good,that is why you need a fuel pressure test gauge,those engines v6 or v8 vortec engines chevy 1996 to up need high psi to open the injectors,ift you have spark but low fuel pressure it won't start,next time do not use gas to the tbi it is dangerous for your self and for the engine,next time open the plastic tube breather and apply wd40 while you crank it,if it start you have a problem with the fuel pump,make sure to test the pressure psi,that fuel pump is expensive,if you replace it i recommend you to buy it from the dealer you need to buy it on this brand ACDELCO,CHECK


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OK, you do have ign. Can you hear the fuel pump come on for a few seconds when you first turn on the key? Most likely if you did, the truck would start and may or may not continue to run, but it sounds like it does not run unless you put fuel in the air intake. Check your fuse for the fuel pump. Most times will not be marked as a fuel pump but as a an ECM or ECU. If your fuse seems good, then you could use the ALDL connector inside the truck to test the fuel pump directly. GM was thoughtful in putting a fuel pump test lead in the connector. Does this truck have a VAT? Also check the pump disable switch. If you have a blown fuse, you better find out why. If you replace the fuse and it runs but blows out when you drive it, you have a wire that is rubbing to ground and needs to be repaired. You can also test the pump directly by tracing the pump wire from the tank, but you must be careful doing this, and it may be beyond your tech ability. Check out for wiring diagrams. If all this proves the pump doesn't work, you will have to drop the tank and replace the pump.

Posted on May 25, 2009


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