--- In peugeot-L@y..., bf135@s... wrote:
> Has anyone owning a pre 86 XN6 ever tried removing the
> whole Air Injection apparatus? ( I know it's probably
> illegal to do so) I noticed the 86 XN6 doesn't have one.
> Anybody know why? Was this a fix for the twitchy Idle
> syndrome? Every post-85 xn6 I've ever driven has a rock
> solid idle.
The pulsair system is not reponsible for a lumpy idle and the system
is inactive when the coolant temp goes above 40 deg C. It's only
purpose is to help light-off the O2 sensor and cat. Late '85-up XN6s
use a heated O2 sensor therefore negating the purpose of the pulsair
system.
A leaking pulsair manifold or check valve hose could introduce fresh
air into the system before the O2 system and cause the engine to run
a little rich.
The late '85-up XN6s use a 60% ECU instead of the previous 50% ECU.
I'm pretty sure this would make the later cars run a bit richer. This
can contribute to a better quality idle. I've also been told that the
fuel injector hoses can affect idle quality too. The skinnier hoses
tend to be better than the big double insulated hoses (like on
my '84). A switch to the VW/Audi style braided stainless steel hoses
is supposed to be the utlimate fix (or so I've heard). The theory is
that the big thick hoses trap more heat and cause pockets of vapor to
form in the lines--thereby interferring with the injectors'
operation. I suppose the stainless lines run cooler.
That WOT vacuum switch and "delay" valve arrangement is kind of odd.
My "delay" valve isn't really a delay valve. It will hold vacuum for
a looooooooong time. There is supposed to be some kind of calibrated
leak inside but mine doesn't do that anymore.
I removed the "delay valve" and hooked the switch directly to
manifold vacuum. Then I rewired it so the switch would ground the "18
degree" thermocontact whenever manifold vacuum dropped. This puts the
This archive was generated by hypermail 2b29 : Tue 08 May 2001 - 09:04:24 UTC