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Oldsmobile Forum: P0301 under heavy load
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  #1  
Old May 16th, 2019
Waynoco81 Waynoco81 is offline
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P0301 under heavy load

Hi everyone. I have a 98 intrigue 3.8. I'm getting a p0301 but only under heavy loads. Any help I could get would be greatly appreciated.
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Old May 17th, 2019
01OldsIntrigueOwner 01OldsIntrigueOwner is offline
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Misfire on Cylinder 1. There are a few causes for that:

1) Fuel injectors (dirty, clogged, or no electrical contact)
2) Spark plug and wires (worn plugs can cause a misfire or a broken/dirty spark plug wire that connects to the distributor cap or ignition coil)
3) Internal engine issues, such as low compression, blown head gaskets, oil rings on the cylinders, and so on

The one thing you can do first is a compression test on all 6 cylinders. If cylinder 1 is lower than cylinders 2-6, then, it indicates a bad gasket or a bad oil ring on the cylinder (inspection and rebuild are necessary).

How many miles does your car have?

For fuel injectors, test the fuel pressure and have a fire extinguisher handy at all times and make sure that you are in a vented area. Have a professional test your injectors in case you don't want to take any chances.

Last edited by 01OldsIntrigueOwner; May 19th, 2019 at 10:37 AM.
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Old May 18th, 2019
mikeaurora mikeaurora is offline
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A detailed compression test can specifically determine what is going on with #1-

try this:

https://support.alldata.com/article/...pression-tests
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