I drive a MCS 2008. So I just coming back from a 15 min drive then while dropping a friend off i left it idling for 10 mins. When I set off about 20 feet my car started moving really slow. i pulled up over and the idle was fluctuation up and down like in the video. Im thinking it might be a mass air flow sensor or a o2 sensor. Does anyone have an idea

 

What's the outside air temp?

Any mods?

Any weird sounds after shutting down the engine?

Any codes?

I had RPM fluctuations, but it was a valve cover leak. I had it taken care of and it's been running like a champ since... even during cold starts in -45 degrees.

 

The temp outside is cold. about 40. I have a alta hot pipe and i havent been able to run the code yet. Ill run them tomorrow with an update. The engine sounds fine it just stutters when shut off.

 

Have you ever had it carbon cleaned?

 

^^^ I think Carlos is right.

 

So I started the are up today and it seemed fine. its was driving strong till it warmed up all the way. I cleared the code and they came back up. The codes im getting are

p1497
p0507 Idle control system rpm higher than usual
1638 throttle valve position control, throttle stuck temporarily
1637 throttle valve position control; control deviation

 

So drove the car today and it was fine till it fully warmed up it goes into limp mode.
The codes I got were p1497 p0507 p1638 p1637
Help plz.

 

p1497-air leak downstream of throttle body. might want to try a smoke test to find any leaks
p0507-idle is too high, idle control not working. probably a result of p1638 and p1637
p1637/p1638-basically, the throttle body can't open/close as it wants to. This also could cause p1497 because the throttle body thinks its letting in less air than its supposed to. Search around the forums and you'll find better info and solutions

 

Thanks man. That really helps. I'll let u know soon. How do I do a smoke test?

 

Probably not something you can do, what they do is run smoke through your air piping at pressure and where it comes out that's a leak. But I'm not sure if I would do that because it could be the computer thinking there is less air because of the throttle not being at the correct place. Basically, you might not have a leak. Get the throttle body looked at first, see how it affects everything else. Has this only happened recently? I've heard that water can freeze in the throttle body and prevent it from moving

 

Do you think I might need to get a new throttle body? Should I pull the old one out and see if it gets stuck?

 

https://www.northamericanmotoring.co...puttering.html
https://www.northamericanmotoring.co...ilable-15.html
Seems like the intake manifold causes the problem. Maybe call dealer and see what they have to say