For a few months now my Check Engine light has been on for my cataylatic converter. A couple weeks ago on my way home from work my car started running like crap, so I assumed the converter finally plugged off. I replaced the converter with a new direct fit and that didn't help at all. I had a misfire on cylinder #3. Turned out to be one of my coil packs, which I just replaced both of them in January, needless to say I was quite pissed off that one had gone bad already. So afterwards the car ran great for a whole day! Check engine came back on and came up with Code P1133, oygen sensor in the exhuast manifold. I was going to wait a few days before I could replace it because I've been broke lately. The day before I was going to replace the O2 sensor the light went off and all seems preety decent except for one annoying problem: When your cruising along and you start to slow down to make a turn or whatever the tachometer will start to bounce back and forth between 800RPM and 1400RPM. I can feel the pulsating in the engine as the car slows down, its like it has a freakin' heartbeat! I know Chevy has always said that they are the Heartbeat of America, but I never thought they meant it literally! But anyways, as the car slows down, the pulsating does to, and when you come to a complete stop, it doesn't do it at all, idles just fine. Only time it seems to do it bad is as soon as I touch the brakes. I have no clue to what it is. It doesn't misfire, and runs like a champ. The car is a 97 Z24 with 85k and an auto tranny(unfornantely). Thanks in advance if anyone might be able to help, and sorry for the long post.
Aaron
97 Cavalier Z24 @ 85k
00 Cavalier Base Coupe @ 152k...rollin on 14's!
97 Grand Cherokee 5.2L@ 260k
The coil housing is the part thatīs usually guilty.
I figured out what the problem was..the TB was pretty dirty and sticky. Went and bought a can of STP TB cleaner and sprayed the living hell out of it and cleaned everything up real good. Also replaced the air filter and dumped a bottle of Lucas injector cleaner in. It seems to have made the problem completly disapper, so thanks for the info anyways. I guess I'm guilty of not using SEARCH before I post....my bad.
Aaron
97 Cavalier Z24 @ 85k
00 Cavalier Base Coupe @ 152k...rollin on 14's!
97 Grand Cherokee 5.2L@ 260k
