hi all so ive done a leakdown check on number 1 and number seven the two cylinders that were throwing misfire codes number seven only losing 5% and number 1 about 8-10% and this was done cold....will do the others tomorrow

 

well 1-3-7 are all at 5% loss number 5 is 18% loss dont really know where to go from here as #1 and # 7 were the misfire cyl this was done cold as well please suggestions?

 

and that is rings? hissing in the crankcase

 

lets go back you had a misfire codes for #1 & #7, did you do any diagnosis before the leak down test?

 

hi yes did all the stuff i thought of good spark changed plugs no a/f in the oil and no smoke at the rear end did a compression test and they all showed the same though i have to admit i think they were a bit low as i didnt roll it over enough warm and cold showed about the same has new coils good spark at those cyl plugs were black though and wet after a brief run thanks for your reply

 

yes codes 301 307 1300 only

 

check ohm impedance at injectors all 15

 

I see new plugs and a coil? wires?

 

yes and checked spark at plug very good

 

How old are the wires? You said that you checked them and you had spark. If they are old, I would replace them. It could also be a intermittent miss causing the code.

Spark Plug Wires for Discovery and Range Rover