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4.3 feels gutless to drive

  #1  
Old 12-31-2018, 10:51 PM
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Default 4.3 feels gutless to drive

Gday all
My 99 LS 4door Blazer has lost its grunt. Car starts,runs & drives well in both 2 & 4wd. Has NO warning lights flashing
on the dash but its gutless under acceleration. I pull plugs out & engine seems to be lean as.
Any advise on where to start checking is greatly appreciated
 

Last edited by MadMerritt; 01-01-2019 at 09:06 PM.
  #2  
Old 12-31-2018, 11:23 PM
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Could it be the transmission or torque converter?
 
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Old 12-31-2018, 11:53 PM
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It appears to be running lean? Have you checked fuel pressure?
 
  #4  
Old 01-01-2019, 12:10 AM
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Trans shifts & downshifts like normal

Not yet as didnt really know where to start lookin. But will check fuel pressure in next day or 2

Cheers
 
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Old 01-01-2019, 02:07 AM
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Check out the sticky at the top for fuel pressure checking, also check the cat for a partial plugged condition, is the outflow good or does it feel weak ?
 
  #6  
Old 01-01-2019, 06:22 PM
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Originally Posted by odat View Post
Check out the sticky at the top for fuel pressure checking, also check the cat for a partial plugged condition, is the outflow good or does it feel weak ?
Outflow does feel a little weak so ill drop the cat out today & check it

Cheers
 
  #7  
Old 02-01-2019, 12:55 PM
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Maybe your fuel injectors are clogged up some??? I would pour a bottle or 2 of SeaFoam fuel injector treatment in your gas tank and see if that helps... It is not expensive and can't hurt even if the problem dosen't go away
 
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Old 02-01-2019, 06:06 PM
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Originally Posted by go chevy View Post
Maybe your fuel injectors are clogged up some??? I would pour a bottle or 2 of SeaFoam fuel injector treatment in your gas tank and see if that helps... It is not expensive and can't hurt even if the problem dosen't go away
go chevy
Even tho seafoam, lucas and other fuel additives are great products stay with the recommended dosage or below.
They work well to remove fuel varnish and other contaminates from the fuel system but they are still a super heavy duty detergent/solvent.
Even tho seals, hoses and such are oil/gas resistant over strength/use can and will slowly eat on and break down such parts over time.
 

Last edited by odat; 02-01-2019 at 10:37 PM.
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Old 02-02-2019, 10:36 AM
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Originally Posted by odat View Post
go chevy
Even tho seafoam, lucas and other fuel additives are great products stay with the recommended dosage or below.
They work well to remove fuel varnish and other contaminates from the fuel system but they are still a super heavy duty detergent/solvent.
Even tho seals, hoses and such are oil/gas resistant over strength/use can and will slowly eat on and break down such parts over time.
Very true indeed! My bad, I meant a 1 time thing lol... I use SeaFoam once a month, 1 bottle in the tank every 4th fill up at the pump
 
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