So I have been getting this truck up to my standards with neglected maintenance items. Finally got all codes cleared, no misfires, monitored live data for 30 minutes at idle. Went for a 30 minute stop and go drive, monitored again, 100% good to go. Had lots of power, smooth idle, etc. Went to replace my rear shocks the next day and the lowest hose on the vapor canister that faces toward the frame by the spare, was not even hooked up. So naturally I put back in the hole, it snapped right in with no problem. Started the truck back up, rough idle AGAIN, drove it around the block and the thing is low on power. Does this mean the vapor canister is clogged? Why didn't it set off codes the day prior? Here are my EVAP numbers after it ran for an hour and was running flawless:



By looking at the EVAP system diagram, is it basically a hose from the gas tank to the vapor canister purge solenoid from the solenoid to the vapor "charcoal" canister, then a line up to the purge valve , then from there to the intake manifold? Guess I need to drive this more to hopefully get a code and know which of the parts needs replacing. Any suggestions on testing the purge valve or the purge solenoid?

 

You can blow compressed air through the canister, about 40 psi, to make sure it's not clogged. Any DTCs? Like po 1413 or 1415?

 

This hss gone away, but i get a daily P0455 and have replaced the gss cap and cleaned up the fuel inlet hose. Thinking its a hose on top of the gas tank.

 

"The code P0455 signifies a large leak in the vehicle's evaporative emission control (EVAP) system."
You might need to check & replace the vent lines between the charcoal canister, fuel tank, up to the intake manifold. You will probably find that the ends of the hoses are stretched out and loose. If that's the case then plan on checking the rest of the vacuum lines under the hood also. If you can, snip off the loose end and reattach the hose if it's in good shape. Otherwise I use silicone vacuum lines for replacements. With silicone hose, zip ties make good clamps.
Something is not connected or is broken in the evap system.

 

Thank you for those tips. I plan to do some digging this fall and hopefully I find a broken line before I have to remove the bed or drop the tank. I have looked for a dedicated evap diagram for this truck, but haven't found one.

 

The low power sounds like vacuum/purge leaks. You might have a fuel tank pressure sensor mounted on the top of the fuel tank, otherwise it's part of the fuel pump. Check and clean that. Check the fuel pump, and fuel lines at the tank.

It's easier to prop the bed up a foot or so if you can get a helper than it is to drop the tank.

What year and engine do you have? I might have diagrams for it.
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2001 RWD 3.0 and I went to remove the bed this spring and someone before me broke a torx bit off in one and 2 are rusted in there and I couldn'tget them to budge, so I suspect I have to cut/grimd them out and replace with new. I'm not new to dropping tanks, but Im afraid of breaking clips/connectors if I choose that route. This isn't a daily driver, its a first truck for my teen son and he wont be driving it full time for another year. I appreciate the help. Also it has plenty of power, I even drove it 90 miles last week, after filling it up before the P0455 came back. Usually I cant go more than 40 miles until it pops up again.

 

I'd drill out the heads of the ones I can't loosen, prop the bed up, then cut out the "nuts" that are on the frame. A new set of bolts is worth it to keep the bed from banging around on every bump you drive over. I bought the cheapest ones I could find for my 96 on Amazon.

I keep coming across original parts on this motor that have probably never been cleaned, like the IAC, that seem fine until you take them off and try to clean them.

With 280k miles everything is suspect until it's not.

Good luck on your son's truck! I'm helping my bro in law rebuild a 1998 ranger for his 14 year old trying to teach him what little we can along the way