Question about 1993 Oldsmobile Cutlass Ciera

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Have a 93 with a 3.3 fuel inj. Car started to burn super rich. Black smoke coming from the exhaust. Car won't stay running because it's over=fueling. Anyone know where would be a good place to start in finding the problem?

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  • rreed127 May 11, 2010

    O.K...I changed the coolant temp sensor. Still does the same thing except now it even chokes out when it's cold. If I unplug the MAF sensor, it runs great. Any other ideas?

  • rreed127 May 12, 2010

    It ran and drove with the maf sensor unplugged. I ended up changing the maf sensor with another I got from a wrecking yard. It fixed the problem. Runs great again now. Thanks fir the help and advise.

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Replace the Maf sensor it is not detecting the atmospheric pressure and is over fueling the engine. Also check the EGR valve it may be stuck open this is a common issue and could cause the black smoke, Also once you fix it you need to do a top engine clean to clean out the carbon on the engine and then do a oil change, if you need help on doing the top engine lcean leave comment and I will give you directions on how to do this.

Posted on May 20, 2010

It didn't work, because the coolant temp sensor ,only puts the vehicles ECM into closed loop when warm,then the O2 Sensor takes over fuel control

You can not run a vehicle without a MAF Sensor.

I would take it to a shop, that can put a scanner on your vehicle and solve this in 10 minutes.

Posted on May 12, 2010

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Sounds like the Coolant Temperature Sensor is telling the computer that the engine is still cold which in turn feeds it more gas. They are not expensive and should fix the problem

Posted on May 10, 2010

Testimonial: "This was a pretty good idea. It made perfect sense since the coolant temp sensor determines how much fuel the system needs because of being cold/hot. Also suggested from a second source. unfortunatly it didn't work though."

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