automotive codes?

Question

code po300 mulitple random misfires what could be the cause.i have tuned up,have v-6 4.3liter..crankes but will not start......

Answer 1

Several times a day, someone asks a very similar question to your's.

It's very helpfull to include a little more information in your question to help us, help you, in your times of trouble.

Some of the simple things to include in your question is:

1) Year of car.
2) Make of the car.
3) Model of your car.
Those three things can help us narrow down known issues with particular vehicles that have certain problems that occur on a regular basis. (ie. recalls and such)

Next, If you could give a more detailed explanation of what is happening when you turn the key to start your car.
1) Nothing happens?
2) You hear a "click", but nothing else?
3) You hear the starter turning, but the engine doesn't turn?
4) The starter turns the engine, but the engine won't start up?
5) The engine turns over, but very slowly.
6) the engine turns, but there's an awful banging noise?

Lastly:
What happened last time you drove it?

1) Drove home fine last night, just won't start today?
2) Was driving fine, and it just died on you?
3) You haven't driven it in a while. It's been parked in storage?

I like to say: "The better the question, the better the answer"

Answer 2

I am assuming that its a GM ..blazer ? Astro ? safari ?
what year .. more information is needed .. 96 and up are OBD2 .. and that's different then 95 and down ...
96 and up it could be a fuel pump problem , or computer problem or a host of things.. is there fuel in the oil ?
please provide more details ..

Answer 3

What vehicle/year?

tuned up....check the firing order. Does it crank smooth or choppy?