Question about 1990 Buick LeSabre

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1990 Buick is cranking but not starting. replaced coil pack and fuel filter with 42 lbs of fuel pressure. Need Help!!

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  • jdavis41089 Jul 12, 2009

    there was no spark. but changed both the coil pack and module.

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Need to know if there is a spark? If there is a spark check the modular which is behind the coil pack

Posted on Jul 12, 2009

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My 1994 park ave, sometimes it starts, sometimes it wont, it does not matter if is is hot or cold, when it is running it runs smooth like there's nothing wrong. I replaced most of the fuel system, spark...


You have three choices. First, check the spark and coil system to ensure you are getting a spark. Pull off a plug wire from the coil pack and crank. Have someone watch to see sparks snapping off the coil pack. If you don't have any replace the control module under the coil packs.

Second, you may not be getting enough fuel pressure. Put a gauge on the fuel pressure test port. You may have a bad oil pressure sensor, located down above the oil filter. Check that oil pressure sender and make sure the connector is pushed in. The power to the fuel pump runs through the oil sender. If the engine starts and oil pressure doesn't come up quickly, the computer will shut off the fuel pump. Check this and you can also manually engage the fuel pump from the relay block down by the passenger feet.

Third choice, and it's a long shot, check the harmonic balancer and the crank position sensor. If the sensor is bad, the computer has no idea when to fire the spark plugs. A magnet is on the harmonic balancer and flys by a sensor to induce a voltage in the coil and tell the computer what position the crank is in.

You also may have a bad computer.

You can figure it out.

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I had the same problem once, bought a new radiator pressure cap and it ended. Though the Code 41 doesn't play with that theory.

Look at this post for a 1990 Buick, scroll about halfway down the page or search for the word "code 41."

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