Question about 1998 Chevrolet K1500

2 Answers

Cranks but no start

Good spark 60#fuel pressure fuel to throttle body pour gas down in throat but still no run replaced crank sensor no help could it be cam sensor

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  • nick63079 Mar 22, 2009

    i have a98 silverado that ran great but one day it wouldnt fire. good fuel pressure 60-63lbs. good spark, plugs are getting wet but still wont fire. changed crank sensor still nothing.checked all sensors going in to pcm no breaks in wiring. does anyone no if gm still uses fiberglass timing sprockets with steel chain. is it possible that it jumped time as soon as i turned engine off? if timing jumped would cam sensor correct the timing as its running or would u notice a difference in the way motor runs (sluggish lacking power) could some one help me with this

  • David Johnson
    David Johnson May 11, 2010

    I was wondering if you ever found a solution to your problem?

  • work4it1 May 11, 2010

    Does it back fire or try to run at all ?

  • michael sinclair
    michael sinclair May 11, 2010

    did the engine run when you put fuel down the throat?

  • Tim Higgins
    Tim Higgins May 11, 2010

    The cam sensor controls fuel injector pulse via computer. Pouring gas in will often not start this motor - or many that are injector fired. ether is the only test really...careful for backfires up the throttle body though and dont do it more than twice.

    Possible the module that controls the spark is messed up and the spark is present but random (even thought it might look bright visually) A strobe light pointed at the hood while cranking may show an erratic spark pattern. . Also pointed at the crank pulley will show erratic sparking. do you get a misfire at all?

    You need to check more than one wire too.

  • David Johnson
    David Johnson May 11, 2010

    yes it could be the camshaft sensor. Have you ran a scan on it? You should be able to check it?

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This might not help you, but, just yesterday i bought a 98 k2500 that wouldn't run. guy i bought it from said he was driving it and it just quit. after checking all the usual items, i replace the coil wire and it fired right up. i ended up replacing all the plugs and wires and it runs and idles very well now. hope this helps someone.

Posted on Mar 22, 2009

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  • 16 Answers

Sounds like the control module.

Posted on Jan 07, 2009

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96 tahoe . It will not crank up unless I pour gas into the throttle body . Once it cranks it will run untill I shut it off but want crank by itself . Why


First, lets be clear with terms. To crank is to turn the engine over, you can do this manually with a wrench on many vehicles. It requires no spark or air. To turn over or to fire is when you achieve combustion. Example: You could pull the spark plugs on a vehicle and turn the key and it would crank, but it wouldn't fire or turn over.

Now it sounds to me like your vehicle is cranking but not firing unless you pour gas in it. My first thoughts are fuel system. I'm assuming it can't be fuel pump because it runs once it fires. Perhaps the fuel pump isn't priming itself, or perhaps somehow air is getting in the line between the injector and fuel pump? Test the fuel pump first by turning the car from off to on (not starting, just on). You will usually hear a short buzzing noise coming from the engine bay that stops shortly afterwards, that's your fuel pump pressurizing the line. (Pro Tip: If you ever try to take your key from off to straight to start and the vehicle doesn't start on the first try, but does the second time no problem, try delaying at on for a moment before trying to start. This gives your fuel pump time to pressurize the line.) Assuming your fuel pump is charging the line, the next place to look would be at the path the fuel takes to the throttle body. When you crank it over and it doesn't start, are you getting any fuel? If you can't see where the fuel enters the system try smelling the exhaust while cranking without it firing, if it smells of fuel you're good and need to look at air flow and spark, if not it's a fuel issue.

Past that, I'll leave it to someone more experienced than myself, but that would be how I troubleshot my own vehicle.

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