hello im new here so bear with me. i need help with my 94 z28. the motor is a remaned motor with less than 10k on it.it has some mods but my problem existed before the mods.the prob is the car runs really rich.and when i easily rev the motorit revs fine. if i rev it fast is has a sputter .it idles fine and doesnt die.i cut the cat off and it didnt fix it.please any ideas would be helpful.

 

If the car is running rich you need to look at the components that determine mixture. Make sure your MAF and O2 sensors are giving good data. Try unplugging the MAF, thus forcing the car to run off the MAP. If it clears up you've found your problem. Is the SES light on?

 

themap for most cars is pig rich. its suitable just for getting u home to figure out what the F is wrong with ur MAF. I learned this after tuning SD with a few guys. when the MAF plug comes out the car just starts dumping fuel

 

im not sure if the ses light is on or not.ill check today.also it seems like my fans come on imediatly after starting it.no the air or the defrost is on i didnt know if this is right or not.yes they stay on.stupid ? but how do i check if the o2 s are sending good signal?

 

When the computer recieves certain problem codes it will trigger the fans to protect the motor. See if the SES light is lit and we can go from there.

 

Yes the ses light is on and when i unplug the maf it didnt make a difference.[:@]

 

Do what the light tells you! Get the computer scanned & get the trouble codes, and use them as a starting point. Also, what makes you think the engine is running rich?

 

the monster cloud of black smoke upon flogging the pedal.and you can smell it.

 

i agree with u getting it scanned but from what ive read on here it will spit out several possibilitys and it ends up being a plug wire or something i was hoping these were tell tell symptoms of something and mayby i could avoid taking it somewhere.

 

Typically if it's a plug wire you'll be able to feel the car missing, and you'll be able to smell unburn fuel in the exhaust. Like we said, get the car scanned and go from there. If they car was missing you should be able to tell. When my car has a cylinder that wasn't firing right it you would be able to feel that it's missing pretty bad until you got up to about 2400 RPM and then it would feel like it smoothed out.