Starting problem in cold weather?
I have 03 Silverado HD. I'm having a hard time starting my truck in cold weather. When I start my truck it runs fine for around 4-5 minutes, than it starts missing and sometimes stalls. When I get the RPMs higher and it warms up it's fine. After it warms up the truck runs fine. I have replaced spark plugs, plug wires, fuel filter, and air filter. This only happens in cold weather. The check ingine light starts blinking when it starts to miss and the code reads a mis fire. But once the truck warms up the code goes away. Could it be a bad coil pack or maybe a plugged injector. Thanks.
I think you are on track suspecting a coil. When they start to break down temperature really can make a difference in how they fail.
I believe also Aztec is on track with the coil pack going bad..this causes 'missfire' codes often. If it is plugged injectors, I'd suggest trying out some additives perhaps it will help get rid of old grimes. You never know, it could be just that simple. Give it a try and let us know!
Since you can "blow it out" and it'll run fine sounds like it's dumping fuel. In other words an overly rich air/fuel mixture. Be careful of that flashing check engine light. It's warning you that the catalytic converter is being damaged by the misfiring. In the old days cars would develop the same symptoms if the automatic choke would stick. Check your coolant temperature sensor. It may have lost it's calibration so the computer thinks the engine is still cold & keeps the air/fuel mixture too rich too long. HTH. -Jim
I have added injector cleaners to the last three fuel fill ups and it's still the same. I'm thinking that its one of the coil packs. Now I have to try and figure out which one. thanks guys for the help I appreciate it.
Idle air control gets gummed up with carbon and gets stuck wherever its at. Really simple to remove and clean with brake cleaner or Carb cleaner.
Pull the codes, P0300 isn't a coil, it will be a lean or rich issue, possibly cause by fuel pressure, vacuum leak, or sticking idle air control. P0301- P0308 are cylinder specific and would be more likely caused by a cylinder specific component like a coil.
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