97' Impreza P0122

[palfer]

Car was running fine but since I had some things apart I unbolted the throttle and gave it a good cleaning on the bench.  Figured that was better than spraying cleaner onto it and have it make its way into the intake.  because no good deed goes unpunished, I now have a P0122 code.

 

its starts fine but for no reason will idle up sporadically then return back down to normal idle.  Doesn't stall or even come close.

 

Any ideas what I could've disturbed?

 

 

thanks!

[Gloyale]

misadjustment  of tps?

 

or otherwise

 

damage to the tps  which would mean get another one.

Edited August 24, 2017 by Gloyale

[golucky66]

Either you left it unplugged, damaged the wiring, or damaged the throttle body.

 

Check the wires and the connector. If both of those are ok. You probably need a new throttle body

[Fairtax4me]

Did you mess with the TPS?

 

No point removing the throttle body to clean it. Blast the spray in there, wipe the sides and the throttle plate with a rag. Any spray that's in the intake will dry up if you wait 15-20 minutes, or burn off when the engine is started.

[palfer]

Is the TPS the electrical connector on the side?  If so, all I did was unplug it and plug it back in upon reinstallation. 

[golucky66]

Yeah. It's on the side of it.

Just check the wires to make sure they didn't somehow pull out of the connector. And they're fully seated in the connector. Then plug it back in.

 

Sometimes the connectors just don't get plugged in fully.

 

Try that. If that doesn't fix it. The internal sensor is damaged. Causing the ecm to not know where its at to control the idle.

[palfer]

OK.  I'll check that out.  Thanks.  I did not mess with that sensor at all so I'm hoping its what you've stated.

[golucky66]

When you move the plate, it's connected to the sensor internally. Can be very easy to damage if you don't take extreme care.

[Gloyale]

tps may not have like being sprayed with solvent.  or it could have washed carbon and gunk into the tps interfering with sensor operation.

[golucky66]

^ agreed. Forgot about that. If you ever read procedures from manufacturers about cleaning the throttle body. There's like 20 warnings.

And solvent is one of those "be careful with" as it can possibly damage the sensor.

[palfer]

So is best practice to remove the TPS when cleaning/spraying the TB to avoid exposure?  Recommend I remove mine to see if there is any debris causing the problem?