Question about 2003 Oldsmobile Alero

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2003 alero 4cyl. 2.2l throwing a #1 misfire code

My 2003 alero 4cyl. 2.2l throwing a #1 misfire code. I've read about other such problems and people have changed there plugs and the houseing unit and still didn't change the problem. Then I've also read that people have said that if after changing the above mentioned parts it still occurs it could be the MAP hose or MAP sensor. Ok great, but where is this hose and sensor located? The Haynes book is no help becaus eit's more about the 6cyl. rather then the 4 cyl. and where it says stuff should be is not where it is.

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TRY MOVING THE WIRE HARNESS TO THE INJECTOR WHILE THE ENGINE IS RUNNING, EVEN STRETCHING IT A LITTLE. THE WIRES CAN BREAK INSIDE THE COVERING AT THE PLUG.

TRY SWAPPING THE #1 PLUG WITH ANOTHER ONE TO SEE IF THE MISFIRE GOES TO THAT HOLE. SAME GOES FOR THE INJECTOR.

LOOK CAREFULLY AT THE COIL HOUSING TO SEE IF THERE ARE ANY CRACKS ALONG THE AREAS CONNECTED TO THE SPARK PLUG. USE A SPARK TESTER ON THE COIL PACK TO CHECK FOR SPARK, THIS MAY REQUIRE THE USE OF SPECIAL PLUG WIRES.

IF NECESSARY DO A COMPRESSION TEST ON THE ENGINE.

Posted on Jul 04, 2009

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The map sensor is located on the throttle body. you have to take off the air intake hose clamps.

Posted on Jul 05, 2009

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