OK, So I have checked everything in the car exhaust wise and fuel leaking wise and the vehicle is running too rich. I had a new air flow meter put in and still no luck. What could be causing this? Thanks.

 

Help us help you by being more descriptive. s4? s5? turbo? na? how are you determining it's running too rich? Did it start doing it all at once or after fiddling with it?

 

My apologies S4 N/A/ It runs fine and starts but the smell of gas from the exhaust is insanely rich. No leaks by the pulsation dampener, nor by the injectors. The smell is from the rear and its burning gas really fast. Since I purchased the car it has been doing it.

 

Does it sputter at idle or does it sound nice and even? Do you have the catalytic converters installed? our cars smell real strong at the rear even when the engine is running at the right a/f ratio if you don't have cats installed or if yours are depleted.

 

Yeah but so strong that it burns through gas like crazy and also smell inside the car..?

 

You didn't answer the question about sputtering so I'm not certain if it's running too rich or if you have an exhaust leak. Things that can make it run rich are :

(1) Coolant temp sensor (corroded terminals or skewed resistance values)
(2) Intake air temp sensor (to a lesser extent)
(3) Fuel pressure regulator diaphragm leaking (remove vac hose to check for leaking fuel)
(4) Engine not at normal operating temp (thermostat)
(5) Injector spray pattern (injector flow test)
(6) Aftermarket fuel pump on NA (such as Walbro)
(7) AFM (which you likely have ruled out)

Bad fuel mileage can also be caused by retarded timing.

 

It does not sputter and it sounds nice and even. It has the catalytic converters installed. ONly two I think.

(1) Coolant temp sensor (corroded terminals or skewed resistance values) Brand new
(2) Intake air temp sensor (to a lesser extent) fine.
(3) Fuel pressure regulator diaphragm leaking (remove vac hose to check for leaking fuel) Where is this located? Picture please
(4) Engine not at normal operating temp (thermostat) Running cool
(5) Injector spray pattern (injector flow test) How?
(6) Aftermarket fuel pump on NA (such as Walbro) Looking at getting one.
(7) AFM (which you likely have ruled out) This is correct

 

If it were indeed way too rich, it would be sputtering, so likely your FPR is ok. Do not put a Walbro on your NA if your engine isn't heavily modified or unless you have a EMS to tune out the richness. The stock pump, if in good condition, is more than capable of fueling your engine. Are they the original cats? if so they are likely depleted, meaning there isn't enough chemical reaction taking place to clean up the exhaust. And your engine temp you said is running cool. How cool? where on the temp gauge? the reason I ask is that if the engine runs too cool (as in weak thermostat) the ECU will be running in a richer fuel map than it would at say 185 degrees. Can you post up a pic of your gauges at full temp or perhaps a video?

 

I know my gauge is always on the lower end. Unless I am driving during the summer days, then it floats around the middle of the temp gauge. I have an 88 vert 5spd n/a.