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2004 chevrolet silverado turns over but won't crank when it's 55 degrees or colder at about 60 degrees it will crank but idle only once it warms up runs fine warmer weather cranks right up runs fine

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  • Robert Swatek
    Robert Swatek May 20, 2016

    There is a much richer fuel mixture during a cold start, the colder the engine the richer the fuel mixture
    retarded ignition timing causing the fuel to burn for a longer period of time makes the engine heat up faster
    anything that doesn't allow the mixture to be properly metered, like vacuum leaks, bad temperature sensors, or O2 sensors, MAF or MAP sensors, bad EGR valves or PCV valves hoses or tubes,
    and or
    anything that will cause the fuel mixture not to burn properly, like worn spark plugs, or any other ignition part, wires, cap, rotor, timing, compression, will cause poor start or no start conditions that are worse in lower temperatures,
    also low voltage, week battery, slow cranking of the engine can also cause hard to start conditions

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  • Cars & Trucks Master
  • 42,028 Answers

Run the fault codes and look for faulty MAF/VAF sensors and ambient temp sensors.

Posted on Nov 12, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 40 Answers

SOURCE: Wont start when weather is cold.

Tune up... its flooding when its cold due to the plugs being worn out...

Posted on Nov 25, 2008

  • 1861 Answers

SOURCE: Car starts hard and runs rough in cold weather, undrivable

The correct spark plugs are very important. Glad to hear you got it fixed good.

Posted on Jan 20, 2009

  • 3 Answers

SOURCE: Engine will not idle and run when starting in cold weather

Have a mechanic take a look at your throttle position sensor and engine idle sensor. Make him manually adjust them as opposed to just putting in new ones. It may require that you have to have a higher idle than normal. Your underlying cause is going to be that I am sure you have a lot of miles on your engine.

Posted on Jul 20, 2009

  • 97 Answers

SOURCE: 2004 silverado cranks but won't start

try the spark plugs do you smell fuel you may want to try starter spray make sure battery is fully charged.write back well try something else good luck thanks

Posted on Nov 29, 2009

mlapres
  • 757 Answers

SOURCE: My 2004 Grand Prix GTP

The usual cause for this problem is the IAC valve. It gets carbon buildup on it that becomes sticky when it is hot, such as after reaching normal operating temperature.

Carefully remove the valve from the throttle body, paying close attention to where the rubber o-ring is...it may come out with the valve or it may stay seated to the valve mounting hole. Either way...don't lose it.

On the valve is the pintle that sits in the throttle body air path, allowing or restricting air intake when your foot is off the pedal...if it is stuck, then pushing the pedal is the only other way your engine can get air.
Use a tooth brush and brake cleaner or throttle body cleaner on the IAC valve and inside it's mounting hole. Carbon buildup in this area is completely normal, however, running premium fuel and keeping a clean air filter will help the engine keep the right air to fuel mixture and minimize the problem...and save your starter too.

Posted on Oct 10, 2010

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