My car started running super rich the other day. I can smell gas super strong out the back and gas mileage has dropped. No ses light and the car runs fine. What could cause this?

355, LE1 heads and cam, 30lb SVOs, 52 mm TB, longtube headers, no emissions.

 

can you datalog?

 

I have freescan, but I can't get it to datalog. How do I do it? I can provide more info if needed.

 

Not sure with freescan, but if you download Datamaster you get 20 free scans I think.

 

I am downloading it right now. Is it easy to use? My car is burning my eyes.

 

Yup its pretty strait forward.

 

By the way, this started after cleaning my MAS.

 

how did you clean it?

 

whats years does the datamaster work for?

 

With Mass air cleaner. Could a blown head gasket cause this? I noticed some oil seeping around my head bolts on the drivers side? I didn't retorque them after I put the engine together. Could I just retorque them now?

 

http://www.ttspowersystems.com/DataM...downloads.html

 

How long has it run sence you cleaned the MAF?

 

The oil is from a leaking valve cover gasket. I have drove it for three days. Everything feels the same as before.I think I hear an exhaust leak at the collector(stupid paper gaskets) Could this cause the O2s to read wrong and not trigger the ses light? I am replacing them tomorrow with good gaskets.

 

If the exhaust leak is before the O2 then yes it can affect the sensor's readings.
The potential causes are almost endless, to really beable to help a datalog would be great.

 

I can't scan it until tomorrow. The O2s are in the collectors after the gaskets. I know one is partially blown because I can see a peice of one hanging. It runs rich from the time I start it on. Still has power and doesn't miss.