P1494 is definitely not a Gas Cap issue - it's an LDP Issue (Leak Detection
Pump). The vacuum fitting you're referring to normally has a vacuum cap in
it and yes...they do either fall off or crack/break off over time.
The VECI Label can be found under the hood - it's normally on the passenger
side on the underside of the hood. If it's not there, you can get a new one
from the dealership (order) and it will have the diagram on there.
- Bernd
-----Original Message-----
From: Fred Allen [mailto:fxallen@shaw.ca]
Sent: Wednesday, October 08, 2008 7:45 AM
To: dakota-truck@dakota-truck.net
Subject: DML: Vacuum Ports 4.7L V8
Hi to the group!
I have just recently joined the list and have just recently purchased a
black 2001 Dakota Sport Club Cab 4x4 with the 4.7 litre V-8,
It was mostly a daily driver for the previous owner and hasn't seen much
4x4 service. It also has the AWD option.
The CEL was on at all times when I bought the truck, owner said it was a
"gas cap" problem. I cleared the P1494 code with my OBDII scanner and the
code reappeared the next day. Later on I found that the vacuum port fitting
at the base of the throttle body had no hose or cap on it.
I plugged this hole off with some tape and this cured the CEL problem.
I'm now has left me wondering if there ever was a hose on this port or if it
was capped off and the cap just disintergrated and fell off over the years.
There apparently was supposed to be an under hood sticker on the unit
showing the vacuum lines layout diagram for the engine but it is missing.
I have also consulted the shop manual and it does not have a useful vacuum
diagram or any illustrations showing the vacuum connections on the throttle
body.
Would anyone on the list be able to tell me if this port was intended to be
capped or have a picture of the under hood sticker for the vacuum lines
layout on this engine?
TIA
Fred Allen
PS Really like the truck, rides great and lots of power.
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