Question about 2005 Chevrolet Silverado

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2005 Chevy Silverado, 4.3 liter, 2wd. It won't start

Coil seems fine, checked plugs randomly and getting good blue spark from them. I can hear fuel pump prime and even tried ether but still won't fire. I drove on Saturday, no prob. Rained on Sunday, and tried to drive on Monday but nothing. It's Tuesday and still raining. Don't know if moisture is prob but have tarp over hooded area anyways.

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  • 95 Answers

Could be moisture is that year a coil pack or distributer

Posted on Dec 05, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: wont start, no spark anywhere

Check the spark, remove the fuse to the fuel pump and remove one of the spark plugs. Connect the plug to its lead and position it well away from the engine against the truck frame (do not hold it) and turn the engine over, check the spark. If no spark it most probably a faulty coil. Check the impedance of the spark plug leads and replace any that are much higher than the rest. My guess is that you have spark but no fuel, What?... OK this is what I think is wrong. Your pump is fine when at position 2 on the ignition switch however when you switch to position three to fire the engine the power to the fuel pump is momentarily disconnected. A leaking fuel pressure regulator or injector would drop the pressure in the fuel line and at the same time flood the engine making it impossible to start. Once you start the engine with ether the ignition is back to position 2 and the pump can make good any loss in pressure but because the intake mix is rich this will cause the engine to run rich too. A good fuel system is capable of delivering 40 - 50PSI of fuel pressure and when switched off up to 90% of this pressure should be maintained for about 5 minutes, if it cannot check out the fuel pressure regulator and injectors. The fuel pipe should be capable of filling a pint pot in about 15 seconds, if it cannot check out the fuel filter is clogged.
Hope the above gives you some pointers

Posted on May 21, 2010

iambanshee74
  • 3489 Answers

SOURCE: 97 chevy blazer 4.3 vortek started fine sunday,

Check the fuel pressure with a guage so we know what that we have a good fuel delivery. There should be a schrader valve to make this easy. Let me know and we will continue on.

Posted on Oct 20, 2010

  • 1243 Answers

SOURCE: I have a 2003 Chevy

you may need to check the compression. if the plugs have fuel on them and you know the spark is good then the only thing missing for the car to run is the compression. if all the cylinders have low compression then the car has jumped time most likely.

Posted on Aug 08, 2011

  • 2002 Answers

SOURCE: 1996 chevy silverado v8 4.3 won't crank. Replaced

Check the voltage coming from the battery and check it again at the coil.I suspect you are not getting the proper voltage going through. Clean all the terminal ends to bare shiny metal and make sure all the connections are tight. If I remember correct your truck still has the HEI setup with the coil in the top of the distributor cap. If all the voltages are good, 12+ volts you should replace the coil. Hope this helps.

Posted on Nov 06, 2011

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