₦airaland Forum

mayor2013:
Is this Honda Accord 2009 the European spec or North American spec?

North America version

Applying this approach to our case study
Verification stage
Physical inspection actually shows that the exhaust is confirmed to be emitting black smoke and from known fact, symptom of black smoke is an indication of high fuel consumption that also confirm the issue of poor fuel mileage as reported by the customer

We follow this logical sequence called the "golden sequence of diagnoses" to achieve a accurate diagnoses and successful fix
1.Verify :Confirm the incident/problem as described by customer
2.Collect :Get further info about the problem
3.Evaluate :Stop and think about the evidence
4.Test :carry out further test in a logical sequence
5.Rectify:Fix the problem
6.Check:Make sure all systems work correctly

Case 3

Car model :Honda accord 2009

Customer complaint: Exhaust is emitting black smoke with confirmed high fuel consumption


Scope of Job Resolution :Fix for the black smoke and resolution of high fuel consumption

N.B:what makes this case a peculiar one is that there is no DTC code registered on the PCM management system !

diportivo:
na so

Trolls are here unfortunately I don't feed troll

afangsoup:
They wan use fanciful equipment plus grammar to deceive car owners in the name of car workshop.

You are part of the reason why we have it bad like this
https://www.nairaland.com/1431269/nigeria-ranked-among-countries-lowest#17990856

How often do u top up the radiator water ?

snofay:
Do u know the meaning of the code rating, if u do den u should be flexible with it. A manufacturer recommendation is due to the environment dat d car is produced to work in and since most cars are produced for European and American consumption den obviously the majority of the cars will carry a 5w30 recommendation. But imagine an oil dat has its maximum temperature limit to be 30 and u are driving at a harsh temperature of 35, what will happen to the viscosity of the oil? What effect will it have on ur engine?

U need to read about synthetic oil technology to appreciate the fact that ,it is special formulated chemical composition that can tolerate a wide extreme high temperate without reaching breakpoints unlike mineral oil that vary widely with temperature .
Beside don't confuse ambient temperature with engine temperature !!!
Majority of the wear and tear that happen on the engine occur at start up .Fresh start up of the car in the morning will require a lighter oil that can flow as quickly to lubricate the topmost part of the engine .few second of delays due to the use of heavier oil will spell doom to the engine in the long run after a long period of accumulated engine starting !!!

snofay:
How can u ask him to use a 5w30 when the minimum temperature in Nigeria is 20. For Nigeria condition, a 20w50 is recommended but ur API RATING is old. U can get an sm or sn oil.

please who gives recommendation for 20w50,it definitely kazeem and Mufu cos there are illiterates ,Toyota will never give such ; Dubai that is hotter than Nigeria has car manufacturer factory and I am yet to see Dubai spec car that will recommend 20w50 later shorten the life span of your engine !!It actually a plus for kazeem sha if your engine start smoking soon sha at least it will keep than relevant till 2030 !!
The only reason use of 20w50 is prevalent in nigeria is ignorance and poverty !!!

amb962:
Hello Guys,

Please i need your advise for my honda pilot 2004.

For some time now, i noticed that during motion, when i try to increase the speed of the car, it makes this noise like when you are revving the engine but the will not move according to the speed required. but suddenly it will jerk and increase speed.This has being on and off for a while now. i cant go above 70 cos each time you try doing above 70, it jerks violently.

Please i need advise on what to do and names or number of garages that can fix the problem.

thanks

Where is your location?

T

Internal Leak Diagnosis Diagnosis test
There are various method to diagnose internal leak .
Testing for compression of each cylinders is one of the method .This involve performing a compression check on each of the cylinder . But in this case the red flag that indicate that we have a diagnosis is "low compression within adjacent cylinder !!
low compression within adjacent cylinder is a indication of head gasket leak !!!!

Thought Process
Coolant leak issue can be only due to two sources
1.External leak
2.Internal leak
External leak are leak due to part of the cooling system eg leaking hose ,weak clips ,bad radiator cap,heater core,radiator etc
While internal leak are leaks internal to the engine :Head gasket leak ,crack engine bore ,crack cylinder, etc
Cooling pressure test can only confirm external leak %100 but cannot pick all cases of internal leak especially subtle internal leak
However ,cooling pressure test has confirmed cooling system integrity of external leak %100 so we will need to confirm internal leak !!
However ,internal leak doesn't just come up unless there has been previous incidence of overheating.Hence there is need to confirm from the customer if such issue has has occured before which the customer actually confirm the affirmative !!! So the possibility is there !!
But the headgasket has been replaced before but the cylinder head was grinded by sandpaper by previous mechanic ( error 101)

Diagnosis approach

Physical Inspection:No obvious leak

Cooling system pressure test :No leak

Radiator cap integrity test : Pass

Case 2 :Toyota Rav 4 2006

[b]Customer complaints :Coolant level is reducing per 1 litre for every 30 km with no obvious leak .

Repair History :Thermostat has been removed ,Radiator has been changed to double cell ,Radiator fan run director, Head Gasket has been replaced !!

Scope of work :Diagnose the reason for the leak

hi Peeps, we continue with another case as the owner of the Nissan pathfinder is yet to bring the car for further test !!!So we continue with the confirmation if a stuck swirl valve can cause rev issue with another Nissan pathfinder that we can laid our hands on !!

Costee:
That's my point. I felt you announced your results rather prematurely as "the engine still later went back to its initial state after some few minutes." What is meant by wrong oil causing the issue indirectly? You stated the facts: compression loss----worn piston-----wrong oil. So in what way is wrong oil indirectly responsible, if not directly? The issue of oil viscosity is one universal controversy that has gone neither here nor there and has remained unresolved. Diagrams in owners' manuals will always graphically display variations that are permissible, though indicating preference for 0-30. Let me quote the owner's manual of the very 2003 Pathfinder you've used:"SAE 5W-30 viscosity oil is preferred for all ambient temperatures. SAE 10W-30, 10W-40 viscosity oil may be used if the ambient temperature is above 0°F (−18°C)." Would say that even at its coldest our ambient temperature here is lower than that stated? Your argument on the role of engine oil in this case appears to me rather far-fetched.
There was another thing you should have explained. The codes that came to your workshop didn't appear today. Yes, you suspected a misfire code, but which hadn't been there. Why was it that it was when you re-drove the vehicle that the misfire code came up? I'm not accusing you of any foul play, but an explanation would have given your procedure some respectability. You completely ignored P1130. I think you'd have to address it to fully resolve the issue at hand.
I appreciate the fact that you want to report real time measures and procedures, but leave your conclusions to when a vehicle that comes to your workshop has been certified as fully cured---and by none else than you!.

This is a long one and I will need to be careful to avoid the trap of getting engaged in unending loop of argument which will defeat the purpose of this thread but I will address this your question one by one subsequently with facts and figures .Every claim must be proof scientific not just mere talk !!!I am proudly a scientist !!
But still let me address the issue of ignoring P1130 .
Like I stated earlier ,we have a scope of work which is primarily to diagnose the issue of inability to rev beyond 2000 RPM.(This car is coming from mechanic) other DTC they is not a pointer to this issue will not be addressed .However ,P1130 is actually a reference code !!!
Secondly ,the issue of misfire is intermittent one and from years of experience I already know intermittent issues wil alwaysl evade the engine computer DTC arrest ,However I make my definite diagnosis not from DTC error code but live data and result from low level analyses (Scope waveform and DVOM readings )Is not compulsory the DTC record it before I can make my inference where it is coming from !!I have my own professional way of taking my reading !!But having it eventually is just a plus !!
Lastly ,U will need to read the conclusion again cos there is no where it is claimed that the issue has been cured by anybody. The conclusion still remain that there is a loss of compression at cylinder 4 responsible for the rev issue .What we have is an experimental session for our R& department after conclusion has already been drawn !!!

mayor2013:
What was the characteristic evebts that took place on the cylinder 4 when it was physically inspected? Am just curios

Misfire event will cause an engine to vibrate and this jerking will depend on the severity of the misfire cos there are different degree of misfire.
Normal engine running without misfire will produce an even repeatative rhythm that a trained ear can easily distinguish from uneven rhythm produced by misfiring engine .Note that the phrase "trained ear"Not everyone can perceive this ,it is more of professional training that develop with constant practice!!!

Costee:
You mean your home made trick reversed in one fell swoop the disability represented by the supposed use of wrong engine oil?

Yes we thought about it that it possible to achieve some momentarily compression gain for case of a very subtle loss of compression(just for experimental purpose) and it works(we enjoy hacking a lot in our workshop) !! but the engine still later went back to its initial state after some few minutes.
Note that we can only achieve this gain cos it a very little below minimum!!! This cannot be possible wen the margin is high
Point of correction :Our supposed hack enable us to achieve a little compression gain caused by loss of Compression not use of wrong oil .

hymadon:
Can anyone please tell what this code is and how to fix it p1361 sensor intermittent interruption. Please... I need a professional ... I use Honda CR-V 2004

Camshaft sensor intermittent interruption !!
Check the camshaft sensor and the wiring integrity !!
The sensor is a 3 wire sensor :
Terminal 1 -Reference voltages -12v
Terminal 3 -Signal voltage ;Pulse signal
Terminal 2 -Low reference;Ground signal
Confirm all these and you will get to the root of the issue!!!

Since we are of the opinion that the loss in compression is just a few psi below spec ,we can do a little bit of reverse engineering to raise the compression a little bit and if possible enable the car to rev past 2000
Fortunately for us ,with our home made trick we were ablw to achieve beyond expectation .
Lol and behold ,the car rev nearly up to 6000 RPM !!! ;

I will update the thread for the progress report of the engines change!!!

Recommended Fix :
Completed engine change:
engines change: the cost of undergoing a genuine engine overhaul will exceed the cost of procuring tokunbo engine

Diagnosis Conclusion :
From the test above ,we can boldly declare that we have a diagnosis :
The misfire is definitely due to worn piston ring due to long history of using wrong engine oil(20w50) for servicing .
The issue of rev not exceeding 2000 RPM is directly due to low compression at cylinder 4 !!!

Cylinder Compression result for cylinder 6 (adjacent cylinder)
Dry test: 160 psi
(No need for wet test cos this cylinder only serve for negative control purpose)

Cylinder Compression diagnosis result for cylinder 4:
Dry test :140 PSI
Wet test :200PSI

Manufacturer stated value for cylinder compression
Standard compression value:185 psi
Minimum compression :142 psi
Difference limit between cylinder: 14 psi

Thought Process to diagnose Misfire at cylinder 4 :
Misfire at a single cylinder can only be limited to issue of low compression at cylinder 4 cos previous mechanic had already changed swapped spark plugs and injector
So the diagnosis test to confirm the compression status of cylinder 4 will be the priority on the list of test to be undertaken before anything else
Therefore cylinder diagnosis compression test will be done to confirm the value of cylinder 4 and the adjacent cylinder 6 and their results will compared

AutoElectNG:
Well done!

More grease to your elbow!!

This is your best outreach ever!!!

Keep up the good work!!!!

Following keenly!!!!!

Thanks

1.Work Procedure
DTC erased and vehicle driven in a way to set the enable criteria for the engine Computer to pick and register the misfire DTC in its memory !!

2.0 Scan tool result after the drive cycle :
Misfire at no 4 cylinder !!

Diagnosis approach and procedure :

1.0 Physically inspection Result :subtle misfire felt !

2.0 Scan result :no misfire DTC
3.0 Live Stream conclusion :There is misfire at bank 2

Overall Conclusion :There is a subtle misfire within one of the cylinder not caught by the engine management computer to be registered as DTC .Hence all the existing DTC need to be erased and vehicle will need to be driven to complete the require cycle to register the misfire DTC.