chrisman183 Posted April 13, 2015 Report Share Posted April 13, 2015 Had a higher than normal idle coming home the other day. This happens about once a year, in the past it's been the throttle plate gummed up and sticking open a little bit. This time is different. The more i drove the worse it got, until finally when i got home i had trouble stopping the car. I shut it off in drive, and then started it back, the idle was 2000. I cleaned the throttle plate anyway, but didn't help at all. I didn't read the codes yet since it only happened last night, and I couldn't drive it this morning, couldn't even shift it to drive. Does this sound more like an IAC or a TPS problem? I was planning on getting codes tonight and cleaning IAC. I'll post codes later. Thanks for any help Link to comment Share on other sites More sharing options...
IceCold Posted April 14, 2015 Report Share Posted April 14, 2015 Had a higher than normal idle coming home the other day. This happens about once a year, in the past it's been the throttle plate gummed up and sticking open a little bit. This time is different. The more i drove the worse it got, until finally when i got home i had trouble stopping the car. I shut it off in drive, and then started it back, the idle was 2000. I cleaned the throttle plate anyway, but didn't help at all. I didn't read the codes yet since it only happened last night, and I couldn't drive it this morning, couldn't even shift it to drive. Does this sound more like an IAC or a TPS problem? I was planning on getting codes tonight and cleaning IAC. I'll post codes later. Thanks for any help Waiting on codes..... Link to comment Share on other sites More sharing options...
chrisman183 Posted April 14, 2015 Author Report Share Posted April 14, 2015 Waiting on codes..... Got these last night: U1064 P0122 P0741 P1122 B1009 B2120 Cleaned the IAC valve and cleared codes. This morning started it back up and it idled really rough for a couple minutes, then went back up to about 2000 and sat there. Just like before. These codes came back this morning: P0122 P1122 P1599 B1009 Link to comment Share on other sites More sharing options...
chrisman183 Posted April 14, 2015 Author Report Share Posted April 14, 2015 So some google searching is showing that it's probably the TPS circuit, and the IAC is just acting on what is being told by pcm. Should I just go ahead and get a new sensor? or is there an easy repair for these maybe, like cleaning or something? Link to comment Share on other sites More sharing options...
KHE Posted April 14, 2015 Report Share Posted April 14, 2015 Make sure the throttle cable is not broken or kinked - trace it from the throttle body to the firewall. Also, make sure the floor mat is not on top of the accelerator pedal. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
RubberCarrot Posted April 15, 2015 Report Share Posted April 15, 2015 Before replacing anything get a can of electrical cleaner. Disconnect any connections in the circuit to the TPS. Spray both sides with the cleaner. Put them back together after 5 minutes dry time. Check it out. I have never replaced a TPS when told it was needed, on any vehicle. This did the trick. These things operate on such small voltage and even less current a little oxidation will knock them out of whack. When I do this I hit every connection I can get to when it comes to sensors. Let us know how you make out. Link to comment Share on other sites More sharing options...
chrisman183 Posted April 15, 2015 Author Report Share Posted April 15, 2015 thanks for the help everyone. It seems to be fixed, at least for the first couple trips I've taken. I replaced the TPS, the old one was really worn out, no spring return action and it spun very freely. Also cleaned the connections with some electrical connector cleaner. Started it up and it runs normally, for 50 miles so far. Link to comment Share on other sites More sharing options...
IceCold Posted April 16, 2015 Report Share Posted April 16, 2015 thanks for the help everyone. It seems to be fixed, at least for the first couple trips I've taken. I replaced the TPS, the old one was really worn out, no spring return action and it spun very freely. Also cleaned the connections with some electrical connector cleaner. Started it up and it runs normally, for 50 miles so far. Good deal, glad you posted your fix! Link to comment Share on other sites More sharing options...
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