My car has been running horrible lately. 9-10 mpg! Big time loss of power (as if there was already much to lose) We run it on the computer, everything is fine untill it gets up to temp. Then the o2 cross count sticks at 000 and it runs horribly rich. So far we have put in a new 02 sensor, MAP sensor, and coolant temp sensor. TPS sensor is fine. At idle, it'll run fine, then begin to die, and than catch itself and run fine again. All fuel pressure is fine... same with compression! Any ideas on what to check next? Thanx!

 

How about your injectors? Mybe some of them are leaking heavily.

 

check for a clogged cat

 

A clogged air filter or restricted intake?

 

Check your snorkel to make sure some f*ckstick hasn't let the windshield washer fluid cap to get sucked in.. that was restricting lots of power for me and causing my car to disel, hehe....

 

check the vacuum lines going to the map sensor at the scensor and on the engine. mine rotted in half, made the gas mileage terrible, ran really rich, not much power smoked balck

 

thanx guys... i'll update as soon i work on the car again!