Question about 1999 Oldsmobile Alero

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1999 olds alero is sputtering i replaced the plugs and wires its still sputtering i get a po300 code

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  • Oldsmobile Master
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CODE PO300 MULTIPLE ENGINE MISFIRE DETECTED CONDITIONS. POSSIBLE CAUSES.WEAK FUEL PUMP.STOPPED UP FUEL FILTER.CHECK FUEL PRESSURE SHOULD BE 41 - 47 PSI. THE MASS AIR FLOW SENSOR CONTAMINATED CAUSE VERY LEAN CONDITIONS.EGR VALVE STUCK OPEN OR PVC VALVE HAS VACUUM LEAK. THE EVAP SYSTEM CANISTER FUEL SOAKED.

Posted on Mar 13, 2011

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Posted on Jan 02, 2017

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97 olds cutlass. Car shuts off randomly, turn it back on and now it has really rough idle, sputters when accelerate and gives off fume smell. Got a po300 code, spark plugs were a no fix. Any ideas


I don't know what a po300 code is but, I would get the Electronic Control Unit checked out. If it is the computer check out all your options: you can buy ECUs on the internet for less than a quarter of what dealers might charge you, also google or youtube, how to change out my ECU, it's usually quick and easy if you have a little skill and a few cheap and common tools.

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Mar 16, 2011 | 1999 Chevrolet Blazer

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I just got a 1999 olds alero the first thing i noticed was starting a little hard sometimes then it died driving down the road w no notice and always stars back up next it got little jumpy when starting...


DO A TUNE UP.CHANGE SPARK PLUGS AND WIRES.CHANGE AIR FILTER AND FUEL FILTER CLEAN FUEL INJECTORS WITH A CAN OF SEAFOAM. HAVE TRANSMISSION FLUID AND FILTER CHANGED. DOING A TUNE UP WILL TELL YOU IF YOU HAVE MINOR ENGINE PROBLEMS OR MAJOR ENGINE PROBLEMS. IF YOU BOUGHT CAR THAT A LEMON YOU CAN TAKE BACK IT. AFTER SO MANY DAYS.

Feb 20, 2011 | 1999 Oldsmobile Alero

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1996 olds cutlas supreme, 3.1 L has trouble codes PO171 and PO300. Any Ideas?


The po300 is a misfire code.This means there is probably a plug,plug wire,ignition coil,or ignition module.Check the coil towers one at a time.These are know for corroding.If you find one that is corroded then replace the plug wire also.Po171 is a lean condition code.The po300 could be causing the po171.If you have not had a tune up Now would be a good time.Hope this helps.Good luck.

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Apr 22, 2009 | 1999 Oldsmobile Alero

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Hi Frank, Give me a call, 866-718-1234 ext 158.

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anytime you are installing aftermarket stereo in car you should purchase wiring harness converter which comes with schematic, but if you insist on doing it old school youll need a repair manual to show color codes on wiring or a 12 light meter but lucky for you I looked up the wiring codes online heres link:
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1 Answer

99 toyota check eng.lt on code po300,po303,po305,po171,p0420


Hey Dan, It cannot hurt to change the Plugs and wires. Make sure and Check all the Fuses and Relays also. Sometimes the Realays can blow or just get old and send a Code also.

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