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kkaiser80
User
Oct 28, 2014, 2:08 PM
Post #1 of 7
(2003 views)
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97 LGT problems idling
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I own a 97 legacy gt and I recently removed the air filter for inspection and put STP gas treatment in and right afterwards I started my car and it will not idle. It drops to like 2-300 rpms and sputters, and somtimes stalls. The car is throwing codes for bad o2, knock, and speed sensors, and a misfire in cylinder 3&4. I know the o2 sensor could cause this but coincidently seconds after messing with air filter? Somone said to check and make sure that I didn't knock any vaccum lines loose. They all seem to be there. Haven't tested for a leak yet though, but I don't hear any hissing. The wires are new, but not sure about the plugs. I'll replace those and hope that fixes the misfire. What could I have managed to messed up to cause this? Or any input would help.
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kkaiser80
User
Oct 28, 2014, 5:26 PM
Post #3 of 7
(1979 views)
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Re: 97 LGT problems idling
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I'll get the codes, it was related to the issues stated not exactly "bad". But I did check the o2 sensor with meter and it's bad. I would like help assessing those issues, but I did find out it was a vaccum leak causing my problem. A dime sized cap plug looking thing came out from the underside of air filter assembly. For the speed sensor code, I found the sensor ànd it's plugged in so it's probably faulty. Thanks for the reply.
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kkaiser80
User
Oct 28, 2014, 5:34 PM
Post #5 of 7
(1969 views)
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Re: 97 LGT problems idling
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I believe by what looked like a ohms meter but I'd have to ask, I'm having Somone help me with the issue as I'm not mechanical savvy as you can probably tell. Haha. I'll get back to you with the codes and what he used to check sensor.
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 28, 2014, 5:46 PM
Post #6 of 7
(1967 views)
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Re: 97 LGT problems idling
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You sure you didn't rip the intake ducting playing around with the air filter or forgot to connect intake vents? Anything that affects the airflow through the MAF sensor can cause stalling, misfiring, and O2 codes to pop up. Also look up inside the sensor and make sure leaves or trash didn't get up into the sensor. It just doesn't make any sense that all this that started right after you inspected an air filter is being caused by faulty oxygen sensors.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Oct 28, 2014, 5:51 PM)
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