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keninn -> RE: 2000 milly running rough (1/15/2007 9:04:00 AM)
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the 2.3(S) has the miller cycle motor. WAY different from the 2.5. the coil on plug(cop) system is a bear to service. i think you have at least 1 bad coil, they cost about 177 each, and there are 6 of them. also, the plugs need to be changed every 60k, and if you pay someone to do them, sometimes they dont do the rear bank, because it is such a pita to get at them. if the ce lite has been disconnected, you probably have random missfire at the very least. if the ce lite is on steady, you can still drive the car, but it is warning you. if the ce lite is flashing, that means do not drive the car, you might damage it further. random misfire will usually set the ce lite flashing. if the coil(s)/plugs are bad, and you keep driving it, ESPECIALLY if you are flooring it trying to "drive thru" the missfire, you will damage the pre cats. the rear cat costs about 416, the front cat about 775. they are also fairly labor intensive to change out. you will also have to change out the o2 sensors, there are 4 of them, about 200/ea.
to get to the coils/plugs, you have to remove the intercoolers. the front bank is very easy, maybe 5 minutes. once the intercooler is off, you will see the coils. 2 bolts hold on each coil, unplug the connector, pull the coil off, and the plugs are right there. take about 30 minutes total. the rear bank is labor intensive, because clearance is really tight, and you have to remove so much stuff. egr valve, the solenoid pack, and, for me, to get to the last(#5) coil/plug, i remove the rear intercooler. BUT, to get the rear intercooler off, you have to remove the battery, which means removing a lot more stuff. take about 2 hours, and you need some extensions/universals to get at the coils/plugs. there will be oil in the plug wells, which can cause the misfire, and/or destroy the coil. if you dont have a scanner to tell you which cylinder is bad, you are in for a very long day. because you will have to do it all over again. some of the aftermarket stores, like autozone, will read out the codes for free. then at least you can have parts ready to change out, and only do the job once. dont cheap out and get buttco plugs, like iridium. pay attention to the plug gap, this is a FI motor, the gap is much smaller(.28-.32), and most aftermarket stores will try to sell you 1.1mm gap plugs. get the wrong plugs, you get to do the job all over again. iirc, factory plugs are about 16/ea.
since we have 2 99s', i have acquired some special tools and parts, because i will probably have to do each job twice. i have already replaced all the coils on one car, and the plugs on both. i have also done the rear exh manifold on one car, along with oxygen sensors. axles were done on both cars at about 60k. seat heaters, brakes, some misc suspension parts. fuel filter is another fun job.
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