View Single Post
Alan L Alan L is offline
Registered User
Alan L's Avatar
Join Date: Apr 2006
Location: New Zealand
Posts: 3,261
While you are doing warm pressure, you should check the boost pressure drop too, as Brian suggests. Warm or cold - all the same - but logical to check when you set up for the warm pressure. You put 7 psi into the WUR port attached to the throttle body, and watch the WUR fuel pressure drop. It should drop 7 psi too. For some weird reason it may be dropping waaay low - which would answer your question. This is probably not the issue since it is a mechanical mechanism and both WURs worked the same. But pay to check while you are in there.
Can do the warm pressure two ways - warm the car up then having everything ready to go, unhook your WUR and connect gauges and turn on again and measure pressure.
Or, can do from cold - hook gauges up and dummy in 12 v (alternative 12V battery) on to the socket pins on the WUR.
After 5- 10 mins you should have reached max pressure as the bimetallic finger does its thing - assuming it is working. (can leave car ignition off til need readings, then briefly depress air plate til pressure comes up to max). But this method does not guarantee your system is behaving like this - if you are not feeding 12v to the WUR then this won't happen in real life. So, if you go by method 2 , you also need to pull the plug off when the car is running and check you are getting 12v from the input plug for the WUR.
Old 07-15-2008, 10:16 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)