P1537 and P1538 indicate a problem with the Intake Manifold Runner Control
(IMRC)... P1573 is undocumented as far as the 96 PC/ED is concerned... might
have to do some extra research there.... P1443 is an IAC error and *may*
have to do with the IMRC. Rather than any simple replacement, there will be
some diagnostic process required. I haven't too much experience with IMRC
(rare for me to work on anything with spark plugs, lately) but I would
probably start by making sure that the IMRC valves are free to move. I
understand that early systems used vacuum actuators and later systems used
If the concern isn't too severe, I may be able to free up some time to study
the system and offer more help later.... just not possible for the next
couple of days. Perhaps someone familiar with any "pattern" failures (other
than the mouthpiece) that may be able to step up to the plate in the
I'll try to check back on your post in the next couple of days to see if any
better help has come your way.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.