93 LX FiveO

i scanned for codes a couple nights ago and got a bad TPS sensor. i replaced it, car ran good after. couple days later i notice the throttle sticking on deceleration, and idling a bit high.

i scan again, i get a bad EGR reading. i clear codes, re-scan EGR again. nothing about TPS or anything.

i have my heater core blocked off right now too

i cleaned the IAC and made sure the new sensor was on tight. i broke a vaccum line goin to the top of the TB but i replaced that too, could that make it idle high?

mattdel

egr would make it idle high if it was leaking, if its stuck it would idle low

Joel5.0

If you mean by idling high, that the idle doesn't drop fast while the car is moving (+6 mph)....that is normal "between shifts" idle strategy.....as soon as the car comes to a complete stop, idle should lower to normal. As long as no sealing problems are in the EGR valve, an EGR code will only cause the EGR function delete/bypass by the system, not affecting spark timing or A/F.

93 LX FiveO

in park it sits at around 1500 rpm's

in gear it wants to idle at 1200 rpm's, if i hold the brake it will drop to 1000

car used to idle perfect at 650rpm's all day.. why would it all of a sudden double?

Joel5.0

Reset base idle with IAC disconnected to 600 rpms, shut engine and re-start, confirm 600 rpms setting, make sure TPS voltage is between .8vdc and 1.0vdc (.7vdc is also OK).....shut engine down, reconnect IAC, start engine and let it idle for 3-5 minutes. LUK(=Let Us Know)