Hi, I am new to the forum, but I do have a serious problem with my 92 F150. It started with a high idle, and has been a thorn in my side since. I have replaced my IAC, TPS, ECT, and throttle body gasket. I have done voltage checks on all sensers, and all but the new TPS is giving me problems. The TPS reads about 2.6. Even though it is a new TPS... So, then I put it on a code reader and I get codes 411 and 412.

411: cannot control idle at high revs
412: cannot control idle at low revs

I have been looking for other vacuum leaks and am still at a loss.

HELP

 

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I guess I am not the only one that doesn't know what to do

 

BUMP BUMP CAn't anyone help

 

sorry man, nobody i asked knows anything about the problem you are having

 

Is it possible that there still is a vacuum leak somewhere? Or could it just be the computer is sending an outrageous signal to the TPS?

 

with some of the earlier computers, sometimes the only thing you can do is go to a good shop or even the dealer

 

Bummer, I hear flashing these computers are pretty expensive