Question about 1999 GMC Sonoma

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My 99 GMC sonoma wont start..

I was driving then suddenly it turned off while driving.starter is okay and working,i changed fuel pump,spark lugs,the computer box,fues boxs and still not working,we tried everything but nothing! if i put some gaz in the engine it turnes on for a sec which we think its fuel pump but we test fuel pump which is still working,there is something between engine and fuel pump that wont let the truck starts,we test the wires that jump the fuel pump but they all good.can anyone please help??

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  • geethro Jan 23, 2009

    its a 99 GMC sonoma 4.0L stick shift. and i did not tried fuel filter myself ,not sure if the mechanic tried that but i will make sure.but i dont know what is a distributor cao or rotor. but anyway the truck wont start for a month and a half now,we tried everything even check engine computer,it keep saying missfire or ignition system but i dont know exactly.

  • geethro Jan 24, 2009

    oh am sorry it is 4.3L v6

  • dj_sutton8 Apr 29, 2009

    i was driving and my truck died. when i went to try to start it will crank **** not run i can crank crank and crank nothing no fire. i checked the fuel filter its good checked to make sure i was getting fuel to the engine. its fine. pulled a 02 sencor to see if it would start. still did not start.

  • ratchethands May 11, 2010

    the only 4.0 gm i know of is the north star ????? they are a caddy motor v8 .im sorry to say i may have to leave this up to one of the other experts sorry and good luck

  • ratchethands May 11, 2010

    before i can help i need a little more info like engine size and displacment (2.2,4.3?) and if you have tried a fuel filter or a distributor cap and rotor?



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Ok... there are a couple of things you can do. i must have miss typed on the cap,rotor . in the back of the motor where the plug wires conect that is the cap that is bolted to the distributor with two torques bits that i believe are t15 in size. there may lie your problem. the posts inside are made of aluminum and they get coroded and dont alow the proper spark. the other commen problem is the exhaust the catalitic converter becomes pluged up. something you can try is remove one of the oxigen sensors and try to start it up if it runs the cat needs replaced. the o2 sensor is a 7/8 nut to remove it. give it a try

Posted on Jan 25, 2009


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