2.2L Performance Tech 16 valve 143 hp EcoTec with 150 lb-ft of torque

Miss on acceleration

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Old Apr 1, 2015 | 08:39 PM
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jbowles49's Avatar
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Miss on acceleration

My 2008 ls has developed a miss on acceleration and gas mileage if off 25%. To start in the morning takes 3 tries exactly. Has 80k. Plan to change plugs and would welcome any ideas as to cause.
Thanks
John
Old Apr 1, 2015 | 08:47 PM
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I would get the codes read. If there is a misfire then there should be a code that will tell you which cylinder it is.
Old Apr 1, 2015 | 09:12 PM
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Code is for random misfire
Old Apr 1, 2015 | 11:27 PM
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There are a lot of things that can cause a random misfire.

There is a tsb for carbon build up causing a random misfire on the 2.4 engine.

I would start checking the basics. Fuel psi being my first test.
Old Apr 2, 2015 | 06:07 AM
  #5  
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Originally Posted by jbowles49
Code is for random misfire
Shall I assUme that means ONLY p0300? That's pretty rare.

Fuel pressure is a pretty good starting guess.
Old Apr 2, 2015 | 06:35 AM
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If it's a random mis-fire and as donbrew mentioned above, could I suggest a Fuel Pump/Filter?
Old Apr 2, 2015 | 07:34 AM
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May I concur with these suggestions and throw in a dirty throttle body! Or battery about to expire! Or loose ground wires! The infamous low oil level?
Please check these suggestions and get back to us.
Old Apr 2, 2015 | 07:51 AM
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How many miles on it?
Old Apr 2, 2015 | 11:59 AM
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Good suggestions especially interesting fuel pressure. Has 80k.
Thanks
John
Old Apr 2, 2015 | 03:58 PM
  #10  
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I see from searching the forum several cases like mine where the fuel pump was the cause. I will go get the codes read and try to get a test gage for fuel pressure. Is there a fitting for this on the fuel rail?



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