High idle problem.
Thread Starter
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From: On the Mississippi Gulf Coast
St. Jude Donor '07, '11 thru '24
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High idle problem.
I just bought this 99 convertible and it idles at close to 2k rpm. It will idle down after sitting for a few minutes, but still very annoying. It is throwing the following three codes:
Thanks for any input
- DTC P0133 HO2S Slow Response Bank 1 Sensor 1
- DTC P1134 HO2S Transition Time Ratio Bank 1 Sensor 1
- DTC P1153 HO2S Insufficient Switching Bank 2 Sensor 1
Thanks for any input
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
O2 sensor issues with LT's...LOL !!!...that's most likely your problem...bring it to your friendly tuner...search the Forum and you will see MANY with LT's having this issue !!
Thread Starter
Race Director
Joined: Aug 2003
Posts: 15,540
Likes: 275
From: On the Mississippi Gulf Coast
St. Jude Donor '07, '11 thru '24
Official Sponsor of the 60 Day VacatioNN
10,000 poster in the "thread" Part II
Thanks for the input guys. I was planning on changing them, but wanted to be sure the code wasnt being thrown by the headers. I can clear the codes and it runs great for awhile, but they eventually come back. How many O2 sensors are there???
Burning Brakes
Joined: Dec 2017
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I want to say the straight 4 pin...but someone will need to validate
Last edited by wscott62893; Apr 12, 2019 at 01:10 PM.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
1 upstream (before cat) and 1 downstream (after cat) on each bank, so 4 total. They have different style connectors so make sure you order the correct ones. One is a straight 4 pin connector, the other is 4 square (2x2). I can't remember at the moment which one of those two is upstream I want to say the straight 4 pin...but someone will need to validate
I want to say the straight 4 pin...but someone will need to validateDOWNSTREAM is square and the UPSTREAMS are rectangular I guess you can say !!
Thread Starter
Race Director
Joined: Aug 2003
Posts: 15,540
Likes: 275
From: On the Mississippi Gulf Coast
St. Jude Donor '07, '11 thru '24
Official Sponsor of the 60 Day VacatioNN
10,000 poster in the "thread" Part II
Thanks again guys. I had the Vette up on a lift at the local muffler shop getting the exhaust tips changed and located the sensors. Gonna be a bitch to change with the close clearance from the long tube headers. I cleared the codes and drove all day yesterday with no new codes and idle back to normal. Im sure it throw the codes again, but for now.......well.... 
