Question about 1995 Oldsmobile Aurora

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Injector problem 4 litre eng.

First time,started car, running rough excess fuel smoking out of exhaust,I replaced all eight inj. with rebuilds.Five of eight staying open,car would run with rail disconneted.Installea injectors worked great for about a month. Drove home on freeway 70 mph running good then slowed down to 50mph on a side road all of a sudden car doesn.t want to excelerate . Got home car running very rough and seems like injector popping or something.idles up and down also fuel smoke coming out of exhaust. Never replaced regul
ator.
any help appreciated

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  • Anonymous Mar 15, 2014

    car runs good idles ok in gear but in park & nautrel seems to misfire & shows code 171

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Hook up to computer (snapon,otc,ect.)need more data to diagonois properly don,t think needed injectors at all head gaskets, map sensor commen on this vech.6184512886 bigjim.

Posted on Nov 30, 2008

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1 Answer

Black smoke from exhaust


Black smoke is an indication of too much fuel-running rich-in the cylinders. The air/fuel mixture is way off-too much fuel. Possible causes are cylinder misfires (runs and idles rough, a noticeable miss), leaking fuel injectors, or a failed fuel pressure regulator.
Take off the vacuum line to the regulator (on the fuel rail?)-if there is evidence of gas in the vacuum line, the regulator has failed and excess gas is being sucked into the engine through the vacuum line.

You should take a fuel pressure reading to check pressure against the specification for your car.
Also possible that the fuel metering is correct, but the air being supplied to the cylinders is lacking. A clogged air filter could cause that, but you would also experience a rough running condition. Since you didn't mention that, I would think the fuel metering is wrong-too much gas.

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Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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