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we dont have this engine here, USA.
but i have the WG jeep book,
starting page 12 , chapter 14
FUEL INJECTION PUMP BLEEDING
(1) If the fuel injection pump has been replaced,
air should be bled at the overflow valve before
attempting to start engine.
(a) Loosen the overflow valve (Fig. 18) at the
rear of the injection pump.
(b) Place a towel below the valve.
WARNING: WHEN CRANKING THE ENGINE TO
BLEED AIR FROM THE INJECTION PUMP, THE
ENGINE MAY START. PLACE THE TRANSMISSION
IN NEUTRAL OR PARK AND SET PARKING BRAKE
BEFORE ENGAGING THE STARTER MOTOR.
CAUTION: Do not engage the starter motor for
more than 30 seconds at a time. Allow 2 minutes
between cranking intervals.
(2) Crank the engine for 30 seconds at a time to
allow air trapped in the injection pump to vent out
the fuel injector drain tubes. Continue this procedure
until the engine starts. Observe the previous WARNING
(3) Tighten overflow valve.
HIGH-PRESSURE FUEL LINE BLEEDING
WARNING: THE INJECTION PUMP SUPPLIES HIGH-
-PRESSURE FUEL OF APPROXIMATELY 45,000 KPA
(6,526 PSI) TO EACH INDIVIDUAL INJECTOR
THROUGH THE HIGH-PRESSURE LINES. FUEL
UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE
THE SKIN AND CAUSE PERSONAL INJURY.
WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE
CLOTHING AND AVOID CONTACT WITH
FUEL SPRAY WHEN BLEEDING HIGH-PRESSURE
WARNING: DO NOT BLEED AIR FROM THE FUEL
SYSTEM OF A HOT ENGINE. DO NOT ALLOW FUEL
TO SPRAY ONTO THE EXHAUST MANIFOLD WHEN
BLEEDING AIR FROM THE FUEL SYSTEM.
Bleed air from one injector at time.
(1) Loosen the high-pressure fuel line fitting at
the injector (Fig. 19).
(2) Crank the engine until all air has been bled
from the line. Do not operate the starter motor
for longer than 30 seconds. Wait 2 minutes
between cranking intervals.
(3) Start the engine and bleed one injector at a
time until the engine runs smoothly.
pump timing is on next page
or tank filter line priming before. above.
the electric secondary air injection pump is easy to replace but is a very expensive part, about $250.00, less if u know someone who can get u a dealer discount, it is the pump that is defective, it alsways is, very short service life, 100's of post about this on Fixya over the last few years..
99-01 Blazers with the 4.3L motor and 00-03 2.2L
motors have the Secondary Air Injection system and I've listed the
codes, part #s, circuit description, and have to fix below.
DTC P0410 (SES Light On) - Secondary Air Injection P1415 and/or P1416 for secondary air injection
Bank A and B can also be set if the powertrain control module (PCM)
detects a heated oxygen sensor voltage mismatch and activates an
internal test to confirm.
Circuit Description: This is located under the radiator (pump,
electric solenoid, and vacuum shutoff valve) and tees off up to the
exhaust manifolds thru 2 check valves on 4.3L. For 4wd remove the front
skid plate to access. The secondary air injection pump is used to lower
tail pipe emissions on start-up. The PCM supplies a ground to the pump
relay, which energizes the pump and the electric solenoid valve. Engine
vacuum is applied to the shut-off valve when the solenoid is energized.
The engine vacuum opens the shut-off valve that allows air to flow to
the exhaust manifolds. Often the pump gets water/moisture in it and
freezes up blowing the fuse and the check valves rust or freeze open
internally and then burn threw the rubber hose, and even melt the lower
“T”, shutoff, and even pump impeller.
Check/Replace as required: 1. You should hear the pump on starting the
Blazer and if you put your hand on it you will feel it running for
about 1 minute. Part #12560095 (AC Delco 215-364) Pump, Sec Air Inj for
1999-2000 L35 (4.3L) or #12568324 (AC Delco 215-425) Pump, Sec Air Inj
for 2001 L35 (4.3L) + 2000-2003 L43/LN2 (2.2L).
The GM # is on your current pump so check it because the Dealer is very
confused and/or out of these and will sub other pumps. You can remove
the pump and take the #25 torx screws out and see if the impeller is
clogged, rusted, melted, etc before spending $100-200 for it. Impeller
should spin freely.
2. Extend the air intake hose that ends halfway
up the passenger side of the radiator about 2 more feet so it can run
between the battery and coolant reservoir and push into the fender hole to keep dry. 99-00 is 5/8 heater hose and inline connector and 01-03 is 3/4 heater hose and inline connector –check size.
3. #12558992 (AC Delco 215-638) air injection
check valves 2 required – most stores sell these for $12-20 each or
Dealer $33 each. If they rattle or the hoses are burned threw replace –
should only flow air into the exhaust. The easiest way is to remove the
two 13mm nuts that mount the check valve pipe to the exhaust manifold
and use a vise to hold them – trust me here. The little exhaust gaskets
should be reusable.
4. #10217106 connect (hoses) 2 required check
valves to pipes (Dealer Only $7 each). If burned threw or hard/brittle
replace. Usually a good thing to plan on buying!
5. #12555165 secondary injection shutoff valve
(vacuum operated in the ¾” hose in the pump outlet to the “T” pipe
under the Blazer (Dealer Only $27). Only open when the pump is on and
vac applied. Also replace the 5/32” vac hose from the solenoid to valve
and solenoid to intake (about 4 ft of it). Once you extend the air
intake listen to the hose end and you should not hear any exhaust noise
after the short initial one minute pump run – if you still do the vac
diaphragm is stuck open/clogged/burned so replace. Vac is applied by an
electric solenoid mounted by the pump #01997264. The center vac port
goes to the intake Manifold vac and the off center vac goes to the shutoff valve above. The vac
should only be applied to the shutoff valve for that 1 minute as the
Blazer starts then is switched off. Hose clamps will be needed here.
6. #10105352 “T” for under Blazer where pump
outlet to both pipes connect – if yours melted! One end is ¾” and two
are 5/8”ends - but you can use a ¾” on all ends with a little lube.
Hose clamps here too.
7. The pumps 30 amps Maxi-fuse (large size) is
under a little black cover between your battery tray and inside the
passenger side fender. You may have to remove your battery to get to
it. Depress the little cover retainer and remove, then pull the large
fuse out to check/replace. There’s also a 10 amp small fuse to check
for the electric solenoid that controls the secondary injection shutoff
valve mounted by the air pump.
8. If you need the 2 lower hoses that connect the
metal pipes to the “T” going to the pump here’s the bad news – Dealer
Only and includes the pipes so over $100.
smog pump or secondary injection pump works on cold starting to inject clean air into the exhaust pipe to help catalytic convertor to burn extra unburned fuel in exhaust gases and improve clean exhaust emissions then shuts off when catalyst reaches the right temp. so i guess your air pump is fine.