Code 0300 &0303

[johnnyquick]

Guys my truck ran fine last night and this am it was hard starting and then ran rough as hell, I hooked up my obd2 and the codes were 0300 and 0303.

1998 with a 5.7 liter and 208,000 babied miles.

I went and got a new cap, rotor, plugs, fuel and air filter, installed everything and same problem..............

Any help my friends would be appreciated, please remember I drove home last night and it ran PERFECT, it sat overnight and this is what I awoke to.

Thanks

[jro909]

what exactly do the codes mean? i'm too lazy to look them up...i'm thinking fuel pressure or pump...

[thearborbarber]

p0300 random misfire

p0303 cylinder 3 misfire

 

Most likely the spider injector assembly is crapping out. Pretty good to get 200000 miles out of it.

[rodram]

In your other post on "Classic Truck" -- both threads started on Tuesday

 

you say you have tested the fuel pressure to be between 52 and 56 psi...

 

... so first off, you need a new fuel pump, in-tank filter screen, and external wiring harness

... replace these and your troubles starting the truck will likely go away immediately ....

 

... even if there are other issues.... you still need a fuel pump

[johnnyquick]

In your other post on "Classic Truck" -- both threads started on Tuesday

 

you say you have tested the fuel pressure to be between 52 and 56 psi...

 

... so first off, you need a new fuel pump, in-tank filter screen, and external wiring harness

... replace these and your troubles starting the truck will likely go away immediately ....

 

... even if there are other issues.... you still need a fuel pump

 

 

Right on the money bro, pump replaced, great pressure!

Still runs`bad though, please follow other thread.

Thanks for your help.