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1

There are two places this could be: ICM or Optispark. The intermittent nature of it leads me to believe it is ignition related. On your year of LT1, ignition issues can pretty much be boiled down to these two things (as you are describing). Just because you've replaced the ICM, does not mean it isn't at fault. Usually the way the engine dies with an ICM ...


1

Since the fuel pressure is good you may also want to check for a vacuum leak. Sometimes a vacuum leak can cause intermittent problems such as this because it may be partially sealed at times. I would carefully check all of the vacuum hoses and the intake boot for cracks or holes.


4

Mitchell shows original equipment plugs are ACDelco 41-962 for the 5.3, which are double platinum plugs. Plug gap is 0.040". I've never used nor sold Bosch plugs before. From talking to people, I've never heard anything good. Make sure the plug gap is correct and that the wires are fully seated. If you still feel that the car is not performing as well as ...


0

I replaced the shifter assembly and that fixed both issues.


0

Rule of thumb: 1. always check fuses first. If fuses are okay, then check relays [those are the silver 'fuses' in the fuse harness. 2. all okay? 3. check major relays under the hood. These are generally box-shaped black plastic with larger wires coming out of them. These are major problems in older cars because of the heat and moisture generated over ...


1

If you've established that you're not getting a spark at the plugs, the next thing to do would be to work back - so test the coil packs. Pull out the plug from one of the coil packs and see if it is getting power, has a good ground, and has some kind of signal coming from the ECU. If it does, chances are it's the coil pack itself that's failed (though both ...


0

Maybe a crack in the ceramic at the top of the coil causing momentary flash over to the engine block. I had that once.


1

The gauges in the dash are actuated by motors. When you turn the vehicle on, they do their "power on self test" and start doing their thing getting the gauges set correctly. If one of them is having an issue, you could be hearing the scratching noise because of this. I had an '04 Suburban which had the speedo go bad and this is exactly what it sounds like. ...


0

Check the start relay. I've seen other f-series owners complaining about this exact issue on this forum.


4

AKA Trembler Coil The trembler coil was a device called a Ruhmkorff or induction coil, widely used in the 19th century.[3] It combines two magnetic devices on the same iron-cored solenoid. The first is a transformer, used to transform low voltage electricity to a high voltage, suitable for an engine's spark plug. Two coils of wire are wound around an ...


6

You should have 2 coil packs on the back side of the engine near the throttle body. Wires run to individual cylinders. I don't know how easy it would be to find locally but you can use an inductance spark tester. http://www.amazon.com/Lisle-19380-Spark-Tester/dp/B0002STS3U Another way to see if the coil pack is firing would be to pull a wire out and ...


1

spark plug wires should last a very long time, so just check them when you get the plugs done, and replace if they're worn out. wires don't really wear with distance, it's time and heat cycles that cause the insulation to eventually degrade. usually there good for several years look for cracking of insulation, particularly at joints. check for corrosion of ...


0

Yes you can turn the crankshaft via its pulley. But this is probably easier. If you want to turn the crankshaft by hand you can use a socket with a long handle / breaker bar on it to "Tighten" the bolt on the end of the engine crankshaft. Usually that bolt holds the harmonic dampener. Be careful here as if the crankshaft gets stiff you might exceed install ...



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