Sup guys i just bought a 99 civic si for cheap but the only problem is that is wasting alot of gas and idk why... Motor is stock it only has a fpg and intake what u guys think it could b?

 

Do a full tuneup.

 

fpg?

 

Fuel pressure gauge?

 

fuel pressure gauge? What is the fuel pressure reading?

 

start with a full tune up..

Rotor
Cap
Plug Wires
Plugs
Fuel Filter
New Oil
Seafoam or BG44K
make sure your brakes are not dragging
and tire pressure
also check if your gas cap is holding pressure

 

Oxygen sensors and check fuel rail pressure first.

 

Or, you could tell us what fuel pressure you're at. What if there is a regulator that he doesn't know of that the previous owner jacked up? Why would you buy a fpg if you weren't going to mess with the fuel pressure?

 

The gauge read 40 it doesnt have a fpr idk y he would install a gauge witout having a fpr...
I was thinkin on buyin the seafoam and see what it does...

 

how about doing a full tune up so you dont have to keep questioning why ur MPG is horrible

 

already did the tune up but still wastin alot of gas a full tank 185 miles

 

If you want help, then provide detailed information.

-Tell us exactly what you did for a tune up.

-Your engine must have an FPR. If it doesn't, that one major problem.

-Calculate your miles per gallon (mpg) for several tanks of gas. Otherwise, we have no idea whether your mpg is really bad.

 

You have an FPR. Whether that be stock or aftermarket.

 

I meant an aftermarket fpr....

 

Spark plugs fuel filter rotor cap oil change ... I think its 18 mpg

 

temp guage stuck? i kno mine was wasting a lot of gas because mine got stuck

 

Spark plug wires and ignition timing are missing and should be done.

Any CEL codes?

 

Have to been getting on it a bunch? Like going into vtec hard core?