Low mpg 3.4 1994

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Old Oct 13, 2023 | 06:02 PM
  #1  
Ryan's camaro's Avatar
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Default Low mpg 3.4 1994

Hi
I have a 3.4 94 camaro its got 110k miles on it there are a couple of issues I have had since I got it that seems impossible to solve for me.
1-engine vibration can be felt at Idle(replaced the eng mount already didn't work).
2-low mpg
I have Replaced injectors,plugs,wires,mudules,fuel filter,IAC,TPS,o2 sensors,map sensor,temp sensor,oil and filter,but no luck I have checked the fuel pressure and thats fine.rpm is stable with no fluctuations at idle small hesitation when accelerating slowly but on heavy acc the car is just fine.
I have replaced everything except air temp sensor and fuel pump and diaphragm. All the parts are gm genuine except for injectors off ebay.
also starts first time no smoke but I hate the exhaust smell.
Any ideas what to do next?
 
Old Oct 13, 2023 | 07:57 PM
  #2  
Y2Keglide's Avatar
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Joined: Dec 2008
Posts: 2,247
From: Yacolt,WA
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CAT might be getting plugged up.
 
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