I know its been up over and over but never found and explanation to my problem.

The car runs great and does not throw any codes...

However I get like 10 mpg Dont know why?! Wouldnt the car run bad if it was running that rich?

I seem to get simillar milage regardless of my driving habits.

Sam

 

Hmmm.

Well,

What engine?

What tranny?

What rear gear?

What mods?

What has been done?

later
Jeremy

 

I guess that info would be useful hehe

its a 305 TPI. I dont think the back gear has been changed allthough it might have been different as per the request of the original buyer.

Its an 88 and has an auto transm.

I have put edelbrock headers and hooker cat back and a bigger better flowing cat. I have the edelbrock base intake manifold and SLP runners.

That is pretty much it.

Spark plugs good, as well as the distributor and cap. and wires.

I want to know what would cause such a huge milage problem. bad spark plugs and such dont cause much.

Sam

 

when is the last time you replaced the o2 sensor

 

well you can see my mods in the sig..

I average 18-20 city/highway. I have gotten as good as 25 on the highway.

 

Well the O2 sensor was changed and i use a heated one as it is now located further down the pipe due to the headers.