4.2L running like a bag of crap

Here is a good link to the test and likely fix for it. The tool used can be obtained at any welding supply shop, it is used for cleaning torch tips.

Pi-Eyed Piper wrote:

Is the air cleaner element filthy? Have you looked at the needle-and-seat assembly in the carb to see if crud is getting past your fuel filter? Have you actually pulled the plugs to see how they look? Have you been getting gas at a different station than you used to?

Just a few of the more obvious things to double-check in case you missed any of them...

-Matt- "..."

ok, I'll check that. With the carb being so new I didn't actually think to do that, I know these carbs can be troublsome.

when a vehicle runs lean does temp go up? Mine is still very normal

While you are in there check the insides of the air tube between the K&N filter and the carb. The reason you get additional power from K&N style filters is because they are poor filters. They allow more air and more dirt/dust than the filter paper type. You can alleviate some of the problems by installing a pre-filter before the K&N.

No, is only does it on the idle circuit, once up to speed it runs normal.

It is from chunks of crud usually found hiding in the steel gas line between the filter and carb. No one remembers to clean this line. Then if you run out of gas, it can suck black chunks from the charcoal canister that cause the same trouble.

Mike

Pi-Eyed Piper wrote:

another symptom I just encountered, I honked on it coming out of a parking lot while grabbing lunch and smelled raw fuel really bad for a few seconds..

Full tank?

Mike

Pi-Eyed Piper wrote:

Ok, then I would be looking for a gas leak on the suction side of the fuel pump. I usually see the leak where the rubber hoses attach to the metal tubes along the frame rails either at the front or rear. I am thinking front on yours.

Check the return line up front for leaks. Same place where the rubber meets.

Mike

Pi-Eyed Piper wrote:

ok. I'll do that. These seem to be 2 different things..or maybe not? I'll check what you've suggested, thanks Mike