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Idle & Oil Pressure Drops when put in neutral to stop!
Today I replaced my whole throttle with a new looking, used throttle body from a 01 Camaro 3.8. Mine is a 99 with a 3.8, 5 speed. Three weeks ago the throttle positioning sensor took a crap on me and wouldn't allow the car to make it anywhere, much less, run good. So I bought a used one with a new gasket from GM.
I just installed it. At first the car ran a little rough from sitting so long. I took it for a drive down the road until it was completely warmed up. However, I noticed, when I would stop at the stop lights in town, the idle would drop to 500 rpm, then back up to the normal 800rpm, then bounce down a little, then it would stay at 800rpm. When I got back home, I left the car running to listen to everything. The engine sounded like it should. The exhaust looked fine....but has the tiniest misfire to it. I only heard it from the exhaust pipes. The idle was stock still at 800rpm, where it normally is, and was not moving. The engine sounded as smooth as silk.
This same problem happened to me 9 months ago. I drove the car daily until the motor started stalling out. Same thing would happen; idle and oil pressure drop, then dead. This would happen when I would put it in neutral to stop. After a few weeks of asking the right people, I was told the motor was being leaned out from the o2 sensors upstream and downstream of the catyletic converter. A year prior to that, the converter clogged up, so my husband replaced it with a straight pipe. I was told the sensors were bad and were leaning out the motor, causing it to stall. So I bought a NEW converter from Jeggs (It was one big piece, from the Y-pipe down), new Magna Flow muffler and new o2 sensors. After it was professionally installed, I never had a lick of problems from it, up until 3 weeks ago.
So, my big question is: Can anyone tell me what's going on with this car?? I've explained the best I could. Any questions, please ask. I would really appreciate some response. Thank You! :-)
I just installed it. At first the car ran a little rough from sitting so long. I took it for a drive down the road until it was completely warmed up. However, I noticed, when I would stop at the stop lights in town, the idle would drop to 500 rpm, then back up to the normal 800rpm, then bounce down a little, then it would stay at 800rpm. When I got back home, I left the car running to listen to everything. The engine sounded like it should. The exhaust looked fine....but has the tiniest misfire to it. I only heard it from the exhaust pipes. The idle was stock still at 800rpm, where it normally is, and was not moving. The engine sounded as smooth as silk.
This same problem happened to me 9 months ago. I drove the car daily until the motor started stalling out. Same thing would happen; idle and oil pressure drop, then dead. This would happen when I would put it in neutral to stop. After a few weeks of asking the right people, I was told the motor was being leaned out from the o2 sensors upstream and downstream of the catyletic converter. A year prior to that, the converter clogged up, so my husband replaced it with a straight pipe. I was told the sensors were bad and were leaning out the motor, causing it to stall. So I bought a NEW converter from Jeggs (It was one big piece, from the Y-pipe down), new Magna Flow muffler and new o2 sensors. After it was professionally installed, I never had a lick of problems from it, up until 3 weeks ago.
So, my big question is: Can anyone tell me what's going on with this car?? I've explained the best I could. Any questions, please ask. I would really appreciate some response. Thank You! :-)
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