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    parkhurst51's Avatar
    parkhurst51 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 3, 2008, 10:24 AM
    1998 cavalier idles rough
    I'm working on a 1998 chevy cavalier. When its cold, it runs very rough, as it warms up it smooths out to just barely noticeable. It has new plugs, wires, coil, 2 new injectors, new fuel pressure regulator. The problem started after the alternator was replaced. A local shop did all the work but the fuel regulator. I found that to be leaking 3 minutes after first looking at the car. It has a P0200 open injector code, P0300 random miss fire code, and P0141 O2 sensor heater code. I have checked the injectors and wiring harness with a dvom for opens. All seems OK. I figure the miss fire code is set from the poor idle condition. I haven't went after the O2 sensor as of yet. The owner of this car has already spent over 800 with no results.
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #2

    Nov 3, 2008, 10:35 AM

    Cold idle problems have been linked to carbon build up on the back of intake valves.
    Has anything been done to de-carbon the engine?
    GM actually has a very good procedure to do a very good job of cleaning this up.
    this8384's Avatar
    this8384 Posts: 4,564, Reputation: 485
    Ultra Member
    		  
    #3

    Nov 3, 2008, 11:39 AM

    Before replacing the O2 sensor, check the fuse that's located inside of the driver's side front door; there's actually a separate fuse for the O2 heater.
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