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Wants to stall under throttle at first start up

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  #71  
Old 11-03-2018 | 12:53 PM
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Well it’s the dangest thing. I went back out to connect my scanner to see if I had the option to see the misfire count, that answer is no. But, I started it up to check the live data again and get the fuel trims and it sounded pretty smooth.

So I throttled her a little and it still sounded smooth. Now I was intrigued so I backed it out and took a short test drive, then a longer one. It’s running great now and doesn’t have a misfire.

Im happy but not convinced quite yet. I will have to run it a few days and see what she does. Maybe it was just a gremlin.
 
  #72  
Old 11-03-2018 | 12:54 PM
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[QUOTE=ajfetterman;698097]
Well it’s the dangest thing. I went back out to connect my scanner to see if I had the option to see the misfire count, that answer is no. But, I started it up to check the live data again and get the fuel trims and it sounded pretty smooth.

So I throttled her a little and it still sounded smooth. Now I was intrigued so I backed it out and took a short test drive, then a longer one. It’s running great now and doesn’t have a misfire.

Im happy but not convinced quite yet. I will have to run it a few days and see what she does. Maybe it was just a gremlin or an answered prayer.
 
  #73  
Old 11-10-2018 | 08:04 AM
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It’s been a week and she’s been running just fine.

Onlly code left is P0420 which from what I gather is typically exhaust. It could use and exhaust so that is next on the list. At least we are getting some road time out of it now.

Still have this weird thumping / pumping type random noise from the rear. It will happen at random times and doesn’t seem to have a pattern.

Thank you guys for your help and if this other noise sounds familiar, give me an idea.
 
  #74  
Old 11-10-2018 | 09:11 AM
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Your going to want any problems with leaking coolant, O2 sensors or misfires cleared up before you install a new cat converter so you don’t kill the new one. Glad it’s running better.

George
 
  #75  
Old 11-10-2018 | 09:14 AM
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Everything is cleared up besides that 420 code. Is that the cat? I know there are some holes on the weld leaving the cat.
 
  #76  
Old 11-10-2018 | 09:22 AM
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It’s the cat efficiency or the O2 sensors mistakenly claiming a lack of cat “conversion”. One quick test is to shoot the cat in front and behind with an IR gun to see if it’s converting. A pressure gauge in the front O2 sensor hole to see if it’s getting plugged from crumbling cat material or looking at the O2 sensors on live data to see if they are outputting correctly.

George
 
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