Question about Pontiac Montana SV6

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I purchased a"Universal" Oxygen sensor (4 wires) for my 98 montana. Is it reliable as a OEM one? Next I have alot of electrical issues: first my gas guage goes to full then drops to empty in about 10 seconds.( Fuel pump unit replaced, no difference). Next my cruise control don't work. Next my rear air leveler pump doesn't work. Next my Tachometer don't work. Next the drivers side power windows don't work. There is this overhead drivers information consule called a DIC, that too don't work. My engine sputters which probably is due to the oxy sensor. The ABS/TCS lights come on. Replaced the following : TPS, IAC, spark plugs and spark plug wires, 3 new coils, VSS, camshaft sensor, x7 and x24 sensors, besides I religiously change the oil every 3 month. Change trans oil/filter every 3 years. Should I take it out of its misery and put it to sleep...permanently or should I continue to work out the problems? If only I could straighten out the electrical bothers me alot. I love the van, but all these problems started one after another first with the Tachometer going limp. What makes the tachometer work? Is it connected to the engine somehow?

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The tach is connected to the coil,on the ignition side.I would check the connections at the battery,and make sure they are shiny clean,no black film on them.Then check the voltage at the battery,while the engine is running,it should be 13.65 to 14.25 volts output.If it is lower than this,with the head lights on,and ac fan,on high,then replace the alternator.Even if the battery has good voltage and starts the car fine,there will not be enough voltage to run the engine properly.These problems,most of them,most likely are tied together,if all this checks out o k<then run a ground from the engine to the body,to assure the inside components are grounded good,then you may have to get onto the dash,and make sure there is a good ground on the components there.If all this looks good,and you have run the ground to the body,replace the ignition switch.

Posted on Nov 18, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 18, 2009

    By the way the o2 that you put in,should be fine.


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Posted on Nov 18, 2009

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Bcm is bad body controle module

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