Very rough idle help please!!!!!!!!!!

[twildman]

Check the valve cover harness.

 

[95_stroker]

Get the codes pulled if the CEL is on. As Tony said, check the VC harness, just not that it is plugged in but pull the plugs apart, there can be burned pins inside the connector that will casue a short and kill an injector resulting in a rough idle.

 

[Tail_Gunner]

So your saying i just need to put fuel in the truck?

What I'm saying is the problem I've described manifests itself with some of the symptoms you've descirbed. It's a POSSIBLE cause, I have no way of telling you for sure what your exact cause is.

If the problem I described, was indeed the cause, getting the level of fuel in the tank above the point where it starts sucking air, would be a temporary work around solution. You'd have to drop the tank and fix it in order to make a permanent fix.

 

[hammer450r]

What I'm saying is the problem I've described manifests itself with some of the symptoms you've descirbed. It's a POSSIBLE cause, I have no way of telling you for sure what your exact cause is.

If the problem I described, was indeed the cause, getting the level of fuel in the tank above the point where it starts sucking air, would be a temporary work around solution. You'd have to drop the tank and fix it in order to make a permanent fix.

Well i put about 10 gal in and she barely running now. She will only try to run if you keep the starter cranking. Im gonna pull the harness off and check that first since it seems the easiest to do. Of course its getting to weather that doesnt make working on a truck too pleasant. Thanks for the help

 

[hammer450r]

Get the codes pulled if the CEL is on. As Tony said, check the VC harness, just not that it is plugged in but pull the plugs apart, there can be burned pins inside the connector that will casue a short and kill an injector resulting in a rough idle.

I pulled the plugs all looked fine. It does seem like the one cover is wet with some oil. I got a P0603 code off the computer

 

[DaveBen]

P0603 is the Keep Alive Memory (KAM) losing power. Nothing really. It means that the batteries were unhooked.

Dave

 

[hammer450r]

sounds like you got a man down, (dead cylinder), puffin white smoke when running? it doesnt clear up at all? is it cold where you are?

It is puffing white smoke but i would hardly call it running? It will only sputter if i keep it cranking. Its about 45 here

 

[Tail_Gunner]

Well i put about 10 gal in and she barely running now. She will only try to run if you keep the starter cranking. Im gonna pull the harness off and check that first since it seems the easiest to do. Of course its getting to weather that doesnt make working on a truck too pleasant. Thanks for the help

How about fuel pressure? Do you have a way of testing the fuel pump to confirm pressure output? There is a plug on the back of the filter housing. Those of us who installed a fuel pressure gauge hooked it up there.

 

[hammer450r]

How about fuel pressure? Do you have a way of testing the fuel pump to confirm pressure output? There is a plug on the back of the filter housing. Those of us who installed a fuel pressure gauge hooked it up there.

No i dont have a way, Is there another way to check?

 

[roosterdiesel]

No other way to check fuel pressure other than installing a gauge to the test port of the filter housing.


I'm guessing the smoke coming out when cranking smells like fuel and not antifreeze. So I'm guessing you have fuel just not getting it ignited.

Have you jumped the GPR to see if you have a bad relay? Also how old are the batteries? What condition are the cables in?