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Code P0101

robausler

By robausler
in Ask A GM Technician

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robausler Enthusiast

robausler

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Please help!! 99 silverado w/5.3 and auto. After a freeway downshift to go up a grade, 65-70 mph, check engine light flashed repeatedly then steady, lost power then shot off. It will start but no power. very rough idle. Replaced MAF sensor, MAP sensor, and TP sensor. still won't run. Also, I have spark at all the ignition modules.

robausler Enthusiast

robausler

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Pulled any codes? Checked fuel filter and fuel pressure

 

 

Thanks for the response. When it occurred, I had P0302 (cylinder 2 misfire) in addition to the P0101 code. I have only had the P0101 code after it broke down. About 1000 miles before the breakdown had new plugs, wires, fuel filter, battery...

 

Would a failed cat cause a truck to be undrivable? I bought the truck with about 100k on it. I'm at 270k now. It always passes smog without issue, last one 2 years ago.

robausler Enthusiast

robausler

Posted
  • Author
Posted
Pulled any codes? Checked fuel filter and fuel pressure

 

 

Thanks for the response. When it occurred, I had P0302 (cylinder 2 misfire) in addition to the P0101 code. I have only had the P0101 code after it broke down. About 1000 miles before the breakdown had new plugs, wires, fuel filter, battery...

 

Would a failed cat cause a truck to be undrivable? I bought the truck with about 100k on it. I'm at 270k now. It always passes smog without issue, last one 2 years ago.

 

 

Disconnected y-pipe, started right up. Cant tell if the idle is rough or not but it doesnt cut off. was able to get it in gear and could probably drive it if I had to.

robausler Enthusiast

robausler

Posted
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Removed the passenger side valve cover and there it was...first spring smashed to bits. i could hear the tapping when I ran it but i figured it was the typical tap I normally got on start up, but louder since it was misfiring. I just need a few months out of it so ill replace the spring and maybe the rod(if the valve isnt bent).

 

I stay regular with changes (mobile one synthetic and lucas). Thinking about replacing both heads but what will that do to the bottom end?? will it blow it out? How can I tell if the Valve is bent. Once I have the spring off, should I be able to move/spin the valve. When the spring broke, it stayed in place. the valve is stuck open. how can I know if the valve hit the piston without pulling the head?

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