One of my freinds in my auto mechanics class has a camaro with a 2.8 but gets horrible gas milelage...What are the likely Problems?

 

Bad O2 Sensor to begin. Check for codes too, could tell you a lot if there are any. Something that was giving me really bad mileage for a while was a cracked exhuast valve. i was wasting an entire cylinder's worth of gas evey time the engine came around. Bad air filter ruins milage too. Misadjusted TPS and or bad ignition components can do it too. I'm sure others will follow with more info, but that's all i can come up with right now...kinda sleepy.

 

Just put in a new o2 sensor in...Its getting like 7 mpg its been pissing me off bad

 

Give us a FULL list of what has been done. Otherwise there will be 50 posts of people saying "did you change this?" and another 50 posts saying "Yes, we changed that"

 

02 sensor , Oil Pan...thats about it

 

well then it sounds like a job for [trumpet sound] TOM P'S MAJOR TUNEUP!!![/trumpet sound] do a search for it. It will most definitely help.

 

Yes do the TomP tune up. Thats the best way to get almost everything out of the way in one fellswoop.

 

LOL! Hey can I attach a trumpet file to my tuneup list?

AJM, most mileage and power problems are related to basic tuneup parts. Guys come in here (and on the tech board) all the time, wondering why their car is so slow, because they've put on an exhaust and a K&N air filter. Of course, they forgot about doing everything else.

Here's the last posting of the tuneup: https://www.thirdgen.org/techbb2/sho...hreadid=162251

 

hey this is his friend with the camaro with bad millage i have changed the oil, plugs, plug wires, o2 sensor and every time i run it for codes it comes up with bad 02 and engine running lean and i cant figure out why i cant fix it.

 

Check for broken exhaust manifold bolts. Check for any exhaust leaks prior to the O2 sensor. Check the injectors, both the resistance and for leakage. Check fuel press reg vac line for fuel. Check timing is set correctly, plug wire firing order. Pull the plugs, what do they look like?

RBob.

 

you beat me to it

 

I'd check the 02 wiring and possibly have your injectors cleaned. Easiest way to do that is buy a spare set from a junkyard and send them to Rick or Rich (can't remember) at cruzinperformance

 

i wanted to test the injectors but i dont know what the resistance should be because i can not find it in any books i look in plz tell if if ya know

 

Resistance should be between 12 and 16 ohms each.

RBob.

 

hey i found an exuast like right where the manifold bolts and i thinkg that might be it cause the o2 wont be reading and gas in the exuast and just dumping more and more in there but its just a theory i dont know if thats it but i dont know how to fix it other than buying an new exuast.