1998 Chevy Lumina THROTTLE BODY,THROTTLE POSITION SENSOR

1998 CHEVROLET LUMINA
122,900 MILES • 6 CYL • FWD • AUTOMATIC
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RJCONRAN
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  • 1 POST
1-Is their a throttle body on this car and how do i clean it, i changed EGR valve,map sensor,mass air flow sensor and finally throttle position sensor finally got check engine light to finally go off after about an 80 mile run cycle light comes on code:P0401-1of2
1st-EGR INSURFICENT FLOW
2nd-throttle postiion sensor reading 0.0
what can i do? need answers if possiable
May 16, 2009 at 6:19 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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JALOPYPAPA
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  • 467 POSTS
When you changed the EGR valve, did you check to make sure the port on the intake where it attaches was unclogged? Often, the problem is not the EGR valve itself but the inside of the intake manifold, which gets coated with gummy stuff and even plugged up with carbon where the hot gases from the EGR hits it.

For the throttle position sensor, if it's not outputting a signal, something's wrong in the wiring or sensor.
Jun 2, 2009 at 8:49 PM