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Finally found my mpg problem

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  #11  
Old 08-28-2012, 01:34 PM
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Originally Posted by Gorn
Yes, A vacuum leak that effect the whole intake will just cause the RPMs to go up. But a vacuum leak to just one cylinder can cause a lean condition in just one cylinder. This means more O2 is hitting the O2 sensor. The PCM will richen all the cylinders to compensate. Now the other cylinders are running too rich causing a drop in power. Now you have to press harder on the gas to get up to speed.
So if my car is running lean because of the leaky upper intake gasket.. It would make the car have bad mileage.. I don't see any loss in power or acceleration. So it may just be leaking in one cylinder causing it to run rich?
 
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  #12  
Old 08-29-2012, 07:51 PM
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Got the camaro back today n here's what they replaced They replaced my upper intake manifold gasket, thermostat seal, lower water manifold gasket and throttle body gasket. And reduced my fuel trim from 20% to the recommended 6%
 
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  #13  
Old 08-30-2012, 12:35 PM
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Going from 20% to 6% means they fixed something. You are going to see a differents in how the car runs.
 
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  #14  
Old 08-30-2012, 04:18 PM
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Originally Posted by Gorn
Going from 20% to 6% means they fixed something. You are going to see a differents in how the car runs.

Yeah but what's funny is that I still have engine vibration from the vacuum leak and I was told by the tech before he started that replacing the intake manifold gasket would fix that...
 
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  #15  
Old 08-30-2012, 07:47 PM
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Hmm, when does the car shake most?
 
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  #16  
Old 08-30-2012, 08:33 PM
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if you have been running rich the plugs and or 02s may be fouled, better check and see
 
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  #17  
Old 08-30-2012, 09:22 PM
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That's what I'm thinking. A bad plug may not create a CEL, and wlll Def cause a shake...

OP, when does your car shake most? Have u double checked ur plugs ?
 
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  #18  
Old 08-30-2012, 10:49 PM
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Originally Posted by Greg08
That's what I'm thinking. A bad plug may not create a CEL, and wlll Def cause a shake...

OP, when does your car shake most? Have u double checked ur plugs ?

The car has been shaking since day 1 I've done a tune up and it still does it.. Ive replaced the bank 1 o2 sensor and it still does it
 
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  #19  
Old 08-30-2012, 10:50 PM
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Shakes at idle but not all the time just intermediatly
 
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  #20  
Old 10-18-2012, 10:21 PM
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Originally Posted by Speedfreak02
Shakes at idle but not all the time just intermediatly
Any update on this?
 
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