When i first start my car in the morning it will break the tires like there is no tomorrow but as soon as the car starts to warm up, the low end just goes away and wont break them lose at all. What could be wrong.
THANK YOU .

 

When your car is cold your computer isn't adjusting your fuel at all, It runs in... I forget if it's called "closed-loop" or "open-loop"... once it warms up the ECM takes over completely, and if somethings not right or whatever the cause is, you won't have as much power, plus the air and fuel going into the engine is a lot warmer after the engine gets hot. Sorry I can't be more detailed, but that's about the basics.

 

Thank you

 

Uh...I think I'm figuring out why you're having so much trouble w/ your own car dude.

The ECM is very much reading inputs from the sensors in open loop mode...throttle position, coolant temp, MAF/MAP, etc. are very much being used to determine fueling.

What's not happening in open loop is fuel delivery adjustment. The ECM uses the stored BLM value and calculates fuel delivery requirements, whereas in closed loop the ECM samples O2 sensor output and recalculates BLM based on what it sees.

 

Yeah the stinkin' thing doesn't like me, plus I've never had a V8 thirdgen before. Thanks for more detail though I wasn't sure if the comp read anything or not in open loop mode, I'd only heard very limited things about it.

 

So do u think i should get a new O2 sensor. I put a new one on a couple months ago though. Or do u think something else is wrong, maybe the ecm its self not working right and giving the wrong signal.

 

If the O2 sensor you installed is a cheap-o brand, swapping it out for a Delco piece is a good starting place. When you get it out, inspect it for discoloration...if it's white and has grainy deposits on it, you're losing coolant internally. If it's black and sooty, the engine was running rich. If it's a nice beige or slighly black, things are good.

Getting into the ALDL stream is a better way to go than throwing parts at it. Check in the DIY_PROM forum for parts and whatnot needed to turn a regular laptop PC into a scan tool.

 

how hot is it runing after it warms up?

 

I say about 220, my temp gauge dont work. It dont get hot enough to over heat though.

 

i am not sure if having a bad o2 sensor would make your car run so bad. you can disconnect the o2 sensor and you should not lose that much power. but it might not hurt to look at.