Re: PLEAD TO TD OWNERS!
From: jsgrubbs2001 (jsgrubbs@hotmail.com)
Date: Sun 10 Feb 2002 - 23:24:48 EST
In response to Bill's post, here are some ideas that TD owners should
consider if they are concerned about excessive smoke.
A Peugeot diesel should be virtually smoke free unless there is a
problem.
Diesels are very sensitive to pump timing--the slightest error will
result in smoke at low RPM or high RPM depending on whether the
timing is advanced or retarded. These puppies aren't like an old
gasoline engine, advanced timing will yield a very small increase in
power--once you pass 1.5 degrees or so, major problems will arise.
A defective EGR valve will result in smoke. Mine wasn't closing all
the way due to carbon buildup (and whatever else that occurs over 20
years) on the pintle and seat.
Injectors wear out over time--some of these older cars may need a new
round... make sure they're balanced.
Valve adjustment is super critical, as it is with all Peugeot
engines. Diesels are even more sensitive because the injection pump
doesn't know the quantity of air that is reaching the cylinders--a
good valve adjustment maintains maximum possible valve lift and
duration.
Any leaks between the turbocharger and intake manifold are bad. Make
sure that stuff is all sealed up.
Dirty air filters are a major cause of smoke. Those oil bath filters
require even more attention if they have been infrequently serviced.
Cars with the "super" EGR system ('84 California, '85-'87 all), make
sure the plumbing from the air flow meter to the turbo inlet is leak
free. Also make sure the solex valve operates normally--should be
totally open at idle and full load. Make sure all the wiring is
good... check the altitude sensor, the injection duration sensor,
*everything*.
Boost pressure--make sure the car is running at maximum specified
boost, I'd bet money that a good portion out there AREN'T. Gas Turbos
are really bad for this, and I have found that the TDs suffer the
same--the spring in the wastegate actuator get weak from heat-cycling
over the years and begins to open the wastegate too early. XD2S
should be 600 mBar (8.7 psi), XD3T should be 800 mBar (11.6 psi).
There is a tolerance of +/- 20 mBar I believe (0.3 psi).
Look over the injection carefully and make sure it hasn't been
tampered with--there should be a tamper seal on the maximum throttle
stop, etc.
The Bosch VE pumps incorporate a fuel shutoff on deceleration mode.
In order for it to work correctly, check the idle speed and adjust it
to spec (around 830 I think).
Cars with cold engine timing advance "kit system" (sorry, been around
Gran Tourismo 3 too long)--check this mechanism over carefully and
make sure it operates only when it's supposed to.
-Joe G
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