1998 s70 THE DREADED PO301

ovlov058R · Post by **ovlov058R** » 31 Oct 2015, 19:10

Hi every body! I have a 1998 S70 non turbo that developed a po301 code.It wants to stall out at idle low power... I changed the spark plugs and did nothing. changed the fuel injector and still did the same. Spark plug Wires were replaced not to long ago.. still the same! Last I did a compression test and it read 60 lbs! My Question to you, do you think it is a head gasket or a burnt valve? Btw The coolant tank would overflow and would go back down when shut off engine. Thoughts? Thanks

Post by **abscate** » 01 Nov 2015, 06:16

You need a compression test on all five cylinders

Cold
Hot
Hot with some oil in the cylinders.

It's easy to screw up a compression test and get bad numbers, too

Post by **regent** » 01 Nov 2015, 10:31

[quote="ovlov058R...The coolant tank would overflow and would go back down when shut off engine. Thoughts? Thanks[/quote]

Definite sign of compressed air (or mixture) going into the cooling system. Do the compression test as abscate advised or else if you run it like this you may blow a coolant hose and end up spending more $$$.
Don't ask me how I know...

ovlov058R · Post by **ovlov058R** » 01 Nov 2015, 14:32

Thanks for your help I'll try it again