idles extremely high then low

[slc311510]

I have a 2007 Chevy aveo. when I start the car it idles extremely high. when I start going its stops idling high and looses almost all power. when I stop it jerks and it
dies. start back up and it idles high again

[petrified.rabbit]

Based on that description alone, I would say its the temp switch for the cold start circuit. BUT, BUT, a bad battery/alternator might be able to cause this..

Any more diagnosis? experiences? elaboration?

[slc311510]

Based on that description alone, I would say its the temp switch for the cold start circuit. BUT, BUT, a bad battery/alternator might be able to cause this..

Any more diagnosis? experiences? elaboration?

it was runnin great before it started this. I plugged my diagnostic scanner into it and the codes that came back are

P161B
P2106
P2110
P0507
P0106
P2135

From what I gathered when I googled the codes its the map sensor. but idk for sure. I've had the car about 6 months and I haven't had any problems at all out of it at all til now

[avguy]

Have you checked for cracks in the map sensor vacuum hose?

[slc311510]

Have you checked for cracks in the map sensor vacuum hose?

Yes I've checked dont see any.

[avguy]

One easy, inexpensive thing to try is cleaning the throttle body with sensor-safe TB cleaner. This also gets gunk off part of the TPS and IAC, and has worked for others in the past to fix this type of problem.

[slc311510]

[QUOTE=avguy;199362]One easy, inexpensive thing to try is cleaning the throttle body with sensor-safe TB cleaner. This also gets gunk off part of the TPS and IAC, and has worked for others in the past to fix this type of problem.[/QUOTE


Ok thanks. And do I need to take the throttle body off to do this?
I did unhook the map sensor yesterday to.see what it did and when unplugged it missed really bad and died, plugged it back in and it done the same as before. So? Would that mean it probably is the map sensor?

[avguy]

Cleaning it off the vehicle is easier and likely to result in a better cleaning. But I've cleaned it on the vehicle, so it certainly can be done that way as well.

Disconnecting the map sensor as you described wouldn't confirm anything, good or bad.

[slc311510]

Cleaning it off the vehicle is easier and likely to result in a better cleaning. But I've cleaned it on the vehicle, so it certainly can be done that way as well.

Disconnecting the map sensor as you described wouldn't confirm anything, good or bad.

Ok thanks for answerin me. One more question. Is their anyway I can see if it is for sure the map sensor before o go spend $65 that I don't have on one and it not be it?

[avguy]

The map sensor can be tested if you have a multi-meter and a vacuum pump. Alternatively, if there's a U-pull salvage yard nearby, you could get one there for a few $.