4.3L 2000 Sierra hesitation/no start

  • 2000 GMC SIERRA

Almost like clockwork as soon as I rolled over 125,000miles it begun. Started out with some bad hesitation until finally It wouldnt start. It cranks but wont fire, pretty strong smell of gas as well. If it sits a few days 3-4 it'll fire up after a little coaxing.

Smelled the dipstick and it had a very strong odor of gas. Thinking I had a leak I eventually got down into the upper intake and there was a nice little glistening pool of gasoline sitting on the intake right below the pressure regulator (#6 cylinder I believe)

I've checked/replaced most of the regular items (60-61psi from the pump) and wont be able to get to the auto store until later this week, but could that little puddle be the cause of my hesitation/no start woes?

I did get the following codes as well

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

P0300 Random/Multiple Cylinder Misfire Detected

Do you
have the same problem?
Sunday, September 23rd, 2007 AT 8:16 PM

1 Reply



Removed the CPI "spider" and cleaned the entire thing, soaked the fpr as well once it was all back together it started right on up. Running pretty bad still. But running. Gonna change the oil to get that gas out of it and see how it goes.

$20 says i'll be replacing the whole assy in a week

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Tuesday, September 25th, 2007 AT 9:12 PM

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