TTEC4843 - Fuels and Fuel Systems - practical
8/9/2011 tuesday
start = 1.00pm finsh = 4.30pm
idle speed device
In todays task we learend how to test idle speed devices.
first thing we did was idle speed device.
what type of cold or fast idle speed control does this vehicle uses? and our one was idle speed control.
Then we moved on by how is the base idle speed ajusted? first thing we used the feeler pin for adjusting the idle speed on the engine.
Then we moved on the next step by checking . is this cold / fast idle speed control activatied by? ECU.
Then we explained the test procedure for checking this control? first thing we did was connecting the TEI and EI terminals togather with a piece of wire to check control.
Then we measured Resistance in the winding.
i used a multimeter on ohms. then we checked for continuity ( resistance ) between the two pins. and our reading was 44.4 ohms which shows there is a continuity.
Then we moved on by using a a digital multimeter measure the duty cycle and frequency that operates the IACV.
Duty 51%
Frequency 0.2444 HZ.
In conculsion
when we check the idle speed control on our egine is was in good condition . then we checked for continuity in the winding between the two pins and we had a reading of 44.4 ohms. which shows us the conttinuity. Then we had our duty test showed us 51 % and the frequancy showed us 0.0244 that showed us how many times it turnes on and off.
Check fuel lines
First we did on the egine was codition of fuel hoses. and our one was = pass
first thing we did was a visual check on the fuel hoses, checking for any cracks, if they are tight, check for any oil leak , check if its lose, and our visual check on the hoses was in good condition no oil leaks and it was nice and tight.
Checking Fuel Pump (Fuel Injection High Pressure)
In todays task we learend how to work with a high pressure fuel. we used a revelant textbook before carrying out the test.first thing we did was using the manual book to follow the procedure for a fuel pump. first thing we did
- using jumper wire connect terminals' Bt and FP on the diagnostic plug
- turn ingnition on
- remove jumper wire
- starte the engine
- disconnect the vacuum sensing hose from the fuel pressure regulator.
- measure the speed idle
- reconnect the vacuum sensing hose from the fuel presure regulator
- measure the presure at idle
- stop the engine
- check that the fuel presure remains as specified for 5min after engine stoped
- Wear overalls, safety boots, gloves , safety glasses
- Ignition on : 265 - 305 kpa ( 2.7 - 3.7 kgf /CM2,38 - 44 psi
- Jumper disconnected : 206 - 255 kpa ( 2.1 - 2.6 kgf/cm2 31 - 37 psi
- Ignition Off: 147 Kpa ( 1.5 Kgf/ cm2 21psi
- Ignition On = 300 Kpa
- The running Pressure Under full engine load ( without manifold = 320 kpa
- maximum output pressure of the fuel pump 87+
- Residual line pressure = 260 kpa
Checking Fuel Pump flow
This shows us of the flow rate in minutes for the pressure regulator for the fuel pump.
method i used was 620 * 6 = 3720 ml perminute. there was no manufacurers specifications.
Locate and identify self test codes and isolate cause.
In todays task we learend how to identify and do self test codes. first thing we did was to check the RPM drop when injectores are discounected. if the winding is not working that could tell us it might be an open circuit. Then we moved on by display the dignostice codes the method we used was turn on the egnition and shorten the dignostic codes which we used a piece of wire connected from TEI to EI. this showed us and understanding if any faults codes or wires is by discournecting the MAP sensor and check the wires from the ECU for faulty wires and any dignostic codes.
That will depend on what is the fault is. this gave us an idea of how to check the injectors and the dignostic codes.
SERVICE AN AIR CLEANER
In todays task we worked on ezzat car which was carburator. first thing we did was . removed the air filter and checked for any damage or excessive dirt or oil contamination to the filter element.
did it pass inspection: no it didnt because there was an air leak in the carburator.
Can it be serviced or does it need repacing: it can be serviced by getting new bushes.
PCV VAlve:
In todays task we did a pcv valve. first thing we check the pcv vavle by clamping the rubber hose ( using a brake hose clamp ) going to the pcv valves does the idle change.? Yes
Then checked if there was any clicking sound. by shacking is and check if it clicks. ? Yes
In conclusion
First thing we did was starting up the engine let it heat up to normal operating temerature. Then we clamped the rubber hose ( using a brake hose clamp ) going to the PCV valve and the idle on the engine changed abit it went dow about 0.5 revs. Because there is no air flowing through the engine. Then we lightly clamped the PCV hose and it shoed there was a clicking sound becasue the plunger was moving freely.
Vacuum Operated EGR Valve
In todays task we learend about the vacuum operated to the egr valve. we did a test on a EGR.
Recoreds of the EGR results.
- Did the engine idle smoothly at normal operating temeperature? yes
- Did the idle spped change with vacuum applied to the EGR valve? yes
- did the valve show any signs of air leaks through the stem seal? no
- in the EGR system working to specification? yes
In conclusion
There was no problems carried out on this EGR system because the EGR system was working to its specifications.
And another method can be used to control an EGR system is by using the ECU to control the EGR vacuum.
ADJUSTMENTS AND EMISSIONS
In todays task we learned about adjustments and emissions. first thing we did was testing a vehicle with a carburetor and without a catalyic converter and recored the results>
- Bring the engine to operating Temperature: yes
- prepare the infra-red gas analyzer as required: yes
- Calibrate the gas analyzer gauges: yes
- set the zero and span settings ( analogue Gagues ) yes
- Fit the sampler hose into the exhausst of the vehicle
- take exhaust gas sample.
And our readingss we had was
ACTUAL BEFORE ADJUSTMENTS.
- H.C. 76 ppm
- C.O:0.05 %
- CO2:14.4%
- O2:11.07%
INDUSTRY STANDARDS
- H.C. 50-500 Ppm
- C.O: 0.5-15
- C.O2: 13-14.5
- O2: 0-2
IN conclusion
The test we did was within the Industry Standards.
EFI Vehicle Test
Actual:
- H.C: 531 ppm
- C.O.: 0.29 %
- CO2: 10.2 %
- O2: 7.1 %
Indusry Standards
- H.C: 5-30
- C.O: 0.05-0.5
- CO2: 13-15.5
- O2: 1.00-3.00
IN conclusion
we couldnt test or adjust because therefor faults and ideals in the car . so we couldnt do any further testing.
Removal And Replacement of diesel Fuel Injectors
In todays Task we learend how to check diesel injectors and replace them.
first thing we did a test on the diesel injectors by using a harbridge Test master machine. then putting each injecor in the machine by checking the spray pattern and if theres any problems with them. we set our machine to a presure of 18 psi .then pumed the injector and we had a nice spray pattern. this showd the spray parrten on the 4 injectors were good and meet the manufacturers specification. if the injectores are faulty you looking for diesel drop and not good spray pattern.
Bleed air from a diesel injection system
In todays task we learned how to bleed out air from a diesel injection system. first thing we did was removing the fuel pump filter to bleed it out. Then we put it back togather. then we did our air bleeding by removing the fuel line which we pumped out the fuel so all the air and the left over fuel to come out.
Describe the location of all the air bleed screws on your engine.
The engine i was working on only had bleed screw ( not including injector pipe nuts ) it was on the fuel pump on the top close to the fuel return.
Then we checked if the engine starts: YES
ELECTRONIC SHUT OFF VALVE
In todays task we learned how to test a electronic shut of valve.
With the ignition on, used a multimeter to test the voltage coming from the ignition switch to the electronic shut off solenoid.
- What voltage is it: 12.2 v
- Total resistance of the solenoid windings: 19.5 ohms
In conclusion
First thing we did was set our multimeter to volts to check the voltage coming from the ignition to the electronic by shutting of the solenoid and our voltage was 12.2 volts. Then we checked our resistance by setting our multimeter to ohms and our resistance was 19.5 ohms. This showed us our solenoid is in good condition and it was clicking.
Diesel Injector pump Timing.
In todays task we learned how to time a diesel injector pump.
First thing we ddi was taking out the fuel pump and putting it back togather. then we let it loose abit so we can move it around and checking the spec for the plunger travel using a dial gadge which we times the injector pump to 0.98. and the special tools we used for it was a dial gadge.
TESTING GLOW PLUGS
In todays task we learned how to test a glow plug. First thing we went through a test
plug 1 | plug 2 | plug 3 | plug 4 | |
Current draw | 11 amps | 11 amps | 11 amps | 11 amps |
colour of glow plug tip | red at the top | red at the top | red at the top | red at the top |
In Conclusion
First thing we did was remove 4 plugs and earth them to ground to check weather thy working or not. and we checked 4 of them if they glow or not and the top of the plugs glowed up red. This showed us that our plugs are useable and the engine would start.
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