About ready to call the tow truck. Codes are 0300, 0304,0305, 0307, 0308? A quick read of forum posts suggest everything from bad gasoline to bad spark plugs and wires. Are these codes being that they are all thrown at the same time suggestive of anything?

Thanks!

Matt

 

Codes are multiple misfire and specifically cylinders 4,5,7,8. Looks like you'll need to get the truck to a place to start tracking down the cause. Ever replaced the coils? Wires? Plugs? Going to need to pull the plugs and examen for fluids, etc. check MAF connections, disconnected hoses, etc. misfire is a result of incorrect mixture of air, electricity and fuel. Just need to isolate which.

 

030x codes are misfires on that numbered cylinder. You have lots of them.

Does it run at all? Is it dark, try seeing if you have a crazy light show of sparks anyplace. Or check the connections at the MAF. The cylindrical thing, after the air box, but before the intake.

Don't run it too long at all with misfires like that. Not healthy for other things.

 

Thanks all - that sounds like a good place to start. I'll get it towed in the am and tinker with it later in the week.?

Plugs and wires were replaced about 4 yrs ago 18k ago, replaced MAF sensor last fall. The engine turns over but doesn't have that final spark to get the engine to fire

 

Did you get the codes off the truck while running, or it would not start at all and then you pulled codes? If it would not start at all, that could be a crank position sensor failure or something fuel related. Before you start going too deep with plugs and wires, check all your connections and hoses. A misfiring engine should still run. If you have no start, the misfires might just be the result of a bad or no-start.

 

So its been a couple of days and I was out of town. So after working with it over the last few days, it seems to fire up just fine when the engine is cold but when it is driven for even a short while, (like when I got to the store and turn the engine off), it won't fire up again until the engine cools down. Then, I get different volley of misfire codes each time...so I may end up taking this to a shop to get a diagnosis unless this sounds like something obvious?

Thanks!

Matt

 

From everything I have read, that is indicative of the Crank Position Sensor.

 

Definitely the symptoms of the crank position sensor. The directions to change it may seem complicated at first, and granted I have not had to do it myself yet, but in reality are not that complex.

You'll need to drop your exhaust (I've done that, just get a deep 1/2" socket and unbolt 3 bolts at the manifold - maybe both sides), then you'll remove the cover over the sensor (may want a ratchet set for that), then unbolt the sensor, unplug it and replace it. I hear it's more dirty work than anything.

Here is the part:
http://www.autozone.com/engine-manag...?checkfit=true

Here is the video:

 

You can check the crank shaft position censor with your scanner, check the live rpm while cranking 0 rpm equals bad sensor.

 

Thank you all! Very helpful!!