Please tell me this is why I'm getting P1494 & rough starting..?




Or at least what's supposed to go on this guy...
Location: Right on top of intake.
Thanks lads,
Rich

 

Kind of looks like a vacuum line.

 

thanks fer the reply.
lemme clarify, it looks like a Vacuum hose fitting.
Any thoughts?

 

P1494 (M) Leak Detection Pump Sw or Mechanical Fault Incorrect input state detected for the leak detection pump (LDP) pressure switch.




I looked at mine, the hose leads to under the fuse box.

 

Look under the battery for the purge solenoid. It should have 2 hoses coming off of it. One of these hoses goes to the fitting in the picture....

 

sweet cheeks of Budhha..
thanks fellers.
Rich

 

ok, so this is weird.

After hooking up a Vacuum line I found dangling on the engine(with a big split in the end), I reconnected it to the empty port on the intaqke.
Now, the truck runs terrible for the first few minutes...
When I first started it yesterday after reconnecting th eline, I couldn;t believe how badly it stumbled: I thought honestly that ti was going to stall...
It seemed to work it self out..
Could this mean that the 'pump' gizmo under the fuse box is bad?
I am baffled as to why hooking up the line made life worse....
Logic dictates that if I UNHOOKED the vacuum line, and left it open, that it would be back to where it was & would actually run better...doesn't make sense to moi...

ugh...
any suggestion is welcomed...

 

RG:

The system has to relearn the fact that this hose is now hooked back up which will stabilize the vaccum. If you need to speed the process up, do a battery disconnect reset by removing the negative cable and depressing the brake pedal for a min or so.

Then, hook back up and go for a drive. System should relearn its parameters and all should be fine.

Don

 

Mine just has a plug on that fitting. 2001 4.7

 

ray doode, does yours have the emission control system that mine does?
I was just told that since the truck came from MASS,that explains why it has this system(they're strict apparently)
Rich