Idle does not return to normal after kickown engaged.

[mgfranz]

While cruising down the freeway at about 65, rpm at about 1700+/-, shift mode set to Auto, I mashed the throttle into a passing gear, rpm jumped to about 5000 and mph went 80-85. When I let off the throttle the rpm stayed at 5000. The only way I could get the rpm to drop was to switch into manual mode.
Bad TPS? Other ideas? I what steps can I take to troubleshoot?

[ross1]

Sounds like a stuck throttle, probably a frayed cable.

[mgfranz]

Sounds like a stuck throttle, probably a frayed cable.

Not sure how that could be when if I switch to manual mode the RPM switches back to a normal level, but I will take a look.

For an update, I pulled a stomp test of the CEL at it returned a 1213, so I don't think it's relevant to this issue, just something else to diagnose, I will check for vacuum leaks, take a good look at the EGR and run a smoke/leak test. Possibilities could be a bad injector since I do get a part throttle/off line slight stumble.

Does anyone know what the normal engine RPM is suppose to be at a certain MPH?

[danielson]

sounds like transmission wasnt shifting up to me.

[mgfranz]

sounds like transmission wasn't shifting up to me.

Hmm... possible, but what would cause that? Fluid level is fine, gear shifting is normal in Auto mode.

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Update:

I found a disconnected vacuum line hanging off the back side of this thing. Not sure what it is but one end connects to a part of the throttle, and the other end connects to the back of the intake. The attached image circles the part the vacuum line was hanging from.

http://www.bimmerforums.com/forum/attachment.php?attachmentid=516440&stc=1

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Also, when checking the vacuum Check Valve, #11611312737 I noticed that it flows air or vacuum in both directions, I assume that it is suppose to flow in only one direction, correct?

[mgfranz]

Replacing the check valve and repairing the vacuum leak had an obvious difference of the engine performance, but the upshift RPM issue is still there. Cruising at 65, I stomp the gas, trans drops down into a passing gear, rpm comes up to about 4500, mph to 80. When I let off the gas the RPM stays high, though I was not able to tell if the trans dropped down into high gear or not.
The CEL will come on for a minute or so then go out, same code, 1213. I did notice an occasional misfire or sputter at speed, which leads me to believe I have a dirty injector or two, plugs look good.

[mgfranz]

I wanted to give a status update to this issue, I found a few issues which once rectified has seem to correct the problem.
First, replaced the check valve and the bad vacuum line attached to it.
Second, I found a cracked spark plug insulator which was causing a misfire, probably the cause of the CEL.
Third, trans fluid level was about a half quart low.

Thanks for every ones help.