EGR VALVE

What are the three sensors or whatever that can bring upthe code po404 for grv valve in general motors cars replaced the valve and the code still coming up what else should i check. the car is a 2001 olds alero V6 checked throttle sensor map sensor. It runs fine at idle but when i kick it down to get on the highway its like wide open and makes it sound like the trans is slipping had it checked ok. and the only code is PO404 egr valve

Be more specif bout the code. maybe ports are plugged or defective egr flow sensor.,what year is the car and model.

The 3.1 s have a port in the intake that is known to plug

Its a 3.4 V6 and i replace the ERG valve and still get code PO404. car runs fine idle and low speeds when i kick it down just sounds like the trans is slipping could it be the crankshaft position sensor.

no it couldn't be! it could still be a plugged port though or a circuit problem or it needs a scan tool to reset the egr pintle position

Thanks i been trying all your suggestions scan tool works but the codeis still on but pending cars was rumnning fine then i got this code PO1639 and it says manufacturer control auxiliary inputs and auxiliary outputs just found out my son put a crankshaft sensor in and now it wont even run would it help if i put the old one back in I told him you guys said not to but kids are kids

well i have it running filled the ports on the egr Valve with gumout and let it soak overnight and put it on that codes gone. Also returned the new one and got refunded.Still have the code Po1639 . did find out its a 5 volt reference 2 circuit GM what ever that means

wiring to the ignition module and or the crank sensor seems to ring a bell

Thanks i will check it out.