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2006 4.3 Random misfires and stalling at idle

SoCalChris

By SoCalChris
in Ask A GM Technician

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SoCalChris Enthusiast

SoCalChris

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I've got a 2006 Silverado WT with the 4.3 V6, and around 155,000 miles. Today, it started misfiring. It doesn't seem to matter what load the engine is under, it's done it at highway speed and on local streets. When stopped at a signal, it died completely a few times today. It didn't have any problems restarting.

 

About 6 months ago I changed all of the spark plugs and wires, and haven't had any trouble until today.

 

Where should I begin looking? Vacuum leak? Coil? Fuel issue?

 

Any suggestions would be greatly appreciated.

 

Thanks

Chris Senior Enthusiast

Chris

Posted
Posted

Mine did it at idle. I would do plus and wires again (my issue) with GM/Delco parts. Then work your way to a fueling issue by checking fuel pressue. Then check out cam sensor or crank sensor if your issue has not been resolved

 

Sent from my Samsung Galaxy S4 using Tapatalk 4

 

SoCalChris Enthusiast

SoCalChris

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On the way in to work today, it made it about a mile and just died completely. It cranks, but won't catch at all.

 

I'm leaning towards the crankshaft or camshaft position sensor, but I'm going to test the fuel pressure this afternoon as well. It's been sitting for a while now, and had some time to cool off. It turned over, although it still wouldn't totally start. I'm going to let it cool completely, and then try again. Several years ago I had a Safari that one of the sensors went out on, and it behaved exactly like this. It would die as soon as the engine warmed up, but ran OK cool.

SoCalChris Enthusiast

SoCalChris

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On Friday, I checked the fuel pressure, and it was ok.

 

Then I tested and there was no spark at all, so I replaced the coil. It ran great, and since then I've put about 300 miles on it. Within the last 100 miles, it's starting missing again at all speeds, and randomly dying while idling. It didn't leave me stranded this time, but I have no doubt that it will pretty soon if I keep driving it.

 

Does this sound like the ignition control module is going out? Or distributor? Something else?

 

Thanks again for the help.

Chris Senior Enthusiast

Chris

Posted
Posted

I have very little knowledge of the v6. I just know basics and told you common issues

  • 2 weeks later...
SoCalChris Enthusiast

SoCalChris

Posted
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I just wanted to post a follow up for anyone else who has this issue.

 

I took out the ignition control module, and had it tested at two different auto parts stores, it tested bad at both of them. I replaced it, and had the same problem.

 

I then noticed that if the truck was running, and I bumped the wires supplying power to the coil, the truck would stutter and die like it had randomly been doing. Bingo.

 

I replaced the wiring harnes bringing power to the coil, and haven't had a problem since. I've put around 500 miles on since then, and the truck is running like new.

 

Thanks again for the suggestions.

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