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18 Egrsyste

The document outlines the inspection procedures for the Exhaust Gas Recirculation (EGR) system, including checks for the EGR vacuum modulator, TVV, and EGR valve. It provides step-by-step instructions for verifying the functionality of each component, including temperature checks and vacuum measurements. If any issues are detected during inspection, appropriate replacements or repairs should be made.

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fredyreyescruz13
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9 views4 pages

18 Egrsyste

The document outlines the inspection procedures for the Exhaust Gas Recirculation (EGR) system, including checks for the EGR vacuum modulator, TVV, and EGR valve. It provides step-by-step instructions for verifying the functionality of each component, including temperature checks and vacuum measurements. If any issues are detected during inspection, appropriate replacements or repairs should be made.

Uploaded by

fredyreyescruz13
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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EG1–88

ENGINE – EMISSION CONTROL SYSTEMS

EXHAUST GAS RECIRCULATION


(EGR) SYSTEM
(Federal and Canada)
EG1–89
ENGINE – EMISSION CONTROL SYSTEMS

EGR SYSTEM INSPECTION


1. CHECK AND CLEAN FILTER IN EGR VACUUM
MODULATOR
(a) Check the filter for contamination or damage.
(b) Using compressed air,clean the filter.

2. PREPARATION
Disconnect the vacuum hose from the EGR valve and,
using a three way union,connect a vacuum gauge to it.
3. CHECK SEATING OF EGR VALVE
Start the engine and check that the engine starts and
runs at idle.

4. CHECK TVV WITH COLD ENGINE


(a) The coolant temperature should be below 30C(86F).
(b) Check that the vacuum gauge indicates zero at 3.500
rpm.

5. CHECK TVV AND EGR VACUUM MODULATOR


WITH HOT ENGINE
(a) Warm up the engine.
(b) Check that the vacuum gauge indicates low vacuum
at 3,500 rpm.

(c) Disconnect the vacuum hose from R port of the EGR


vacuum modulator and connect R port directly to the
intake manifold with another hose.
(d) Check that the vacuum gauge indicates high vacuum
at 3,000 rpm.
HINT: As a large amount of EGR gas enters, the
engine will misfire slightly at this time.
(e) Disconnect the vacuum gauge and reconnect the
vacuum hoses to the proper locations.
EG1–90
ENGINE – EMISSION CONTROL SYSTEMS

6. CHECK EGR VALVE


(a) Apply vacuum directly to the EGR valve with the
engine idling.
(b) Check that the engine runs rough or dies.
(c) Reconnect the vacuum hoses to the proper locations.
IF NO PROBLEM IS FOUND WITH THIS INSPECTION,
THE SYSTEM IS OKAY; OTHERWISE INSPECT
EACH PART

TVV INSPECTION
CHECK TVV BY BLOWING AIR INTO PIPE
(a) Drain the coolant from the radiator into a suitable
container.
(b) Remove the TVV.
(c) Cool the TVV to below 30 C(86F).
(d) Check that the air flows from pipe J to the air filter.

(e) Heat the TVV to above 44 C(111  F).


(f) Check that the air flows from pipe J to pipe K.
(g) Apply sealant to the threads of the TVV and reinstall.
Sealant: Part No. 08833–00070, THREE BOND 1324 or
equivalent
(h) Fill the radiator with coolant.
If a problem is found, replace the TVV.

EGR VACUUM MODULATOR INSPECTION


CHECK EGR VACUUM MODULATOR OPERATION
(a) Disconnect the vacuum hoses from ports, Q and R of
the EGR vacuum modulator.
(b) Plug ports P and R with your finger.
(c) Blow air into Q. Check that the air passes through to
the air filter side freely.
(d) Start the engine and maintain the speed at 3,500 rpm.

(e) Repeat the above test. Check that there is a strong


resistance to air flow.
(f) Reconnect the vacuum hoses to the proper locations.
EG1–91
ENGINE – EMISSION CONTROL SYSTEMS

EGR VALVE INSPECTION


1. REMOVE EGR VALVE
Check the valve for sticking and heavy carbon de–
posits. If a problem is found, replace it.
2. INSTALL EGR VALVE WITH NEW GASKET

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