After An Engine Tune Up

[PreseaLover]

1.check your plugs and HT leads ok , if all that not changed for long years then it's time to change,

2.check all vacum lines for leaks specially those line goes to lower parts of TB (leaks will change your fuel trim)

3.if your car misfires in ideal, do a compression check in each engine cylinder and timing with proper tools and set to OEM settings.

Car doesnt misfire... Starts well, axcelerates well, no noises just runs smooth...its just the fuel consumption that is a lil bit high... However i called Asnu lanka and they said they first plug the car to their machines and wi do a checkup as to what needs to be done...i beloive all this afformentioned aspects will be checked by that time, yes?

[aps]

Car doesnt misfire... Starts well, axcelerates well, no noises just runs smooth...its just the fuel consumption that is a lil bit high... However i called Asnu lanka and they said they first plug the car to their machines and wi do a checkup as to what needs to be done...i beloive all this afformentioned aspects will be checked by that time, yes?

Car doesnt misfire... Starts well, axcelerates well, no noises just runs smooth...its just the fuel consumption that is a lil bit high... However i called Asnu lanka and they said they first plug the car to their machines and wi do a checkup as to what needs to be done...i beloive all this afformentioned aspects will be checked by that time, yes?

hope other members will answer this, no experience with Asnu Lanka

[bycap]

Right now the fuel consumption is 9km in colombo - traffic hours... And this is a manual and I keep the RPM below 2.....

The owner who used this car in 2010 told me back then it did 11km in city....

However my co-worker has the same manual presea and his one did 9km in city and after his tuneup it now does 11.5-12km in city...

I feel your figure is somewhat reasonable. 11.5 - 12 kmpl in city seems somewhat unrealistic. Anyhoo, I went for Dhammika Fernando at Kota Rd. He seemed a person who knows what he is doing.

[Sierra Charlie]

Car doesnt misfire... Starts well, axcelerates well, no noises just runs smooth...its just the fuel consumption that is a lil bit high... However i called Asnu lanka and they said they first plug the car to their machines and wi do a checkup as to what needs to be done...i beloive all this afformentioned aspects will be checked by that time, yes?

hope other members will answer this, no experience with Asnu Lanka

I got my injectors cleaned from them. They're good at that. Ultrasound cleaning and the works. But as far as I know they don't have diagnostic tools. Their operation is a bit of a dodgy one. There's one gent who runs Asnu Lanka and there's a mechanic who does all the servicing. They have a some sort of a back rubbing arrangement.

If you go to Asnu, this is what usually happens. Gent talks to you and asks you to go to XYZ place to get the injectors removed. You go to XYZ place and they remove the injectors and they take the injectors back to Asnu in a mo bike. It's a good 500 meters between these two places. So you'll have to take a tuk or just walk. Asnu gent cleans the injectors and shows you how the thing is done and a before/after comparison, which usually is impressive to laymen like us. This is of course unless your injectors are not too dirty.

By this time the mechanic will have done his best to convince you to do this and that. I did get my spark plugs changed with the guy because he had the correct one and the set cost me like 2000 bucks. If you're naive, I felt that the mechanic might be able to get the better of you.

TL;DR - What I would recommend is get the tuning done by a reputed specialist like Mr. Dhammika Fernando. Then go do Asnu if he suggests. Asnu is really good at what they do. But I just don't like the arrangement they have.

[Rumesh88]

Asnu gent cleans the injectors and shows you how the thing is done and a before/after comparison, which usually is impressive to laymen like us. This is of course unless your injectors are not too dirty.

How do they compare the performance of injectors before and after?

BTW there is nothing wrong with the arrangement of Asnu as I see it. It is their specialty and their division of labor. Even Mr. Dhammika does the same thing.

Edited June 17, 2015 by Rumesh88

[Sierra Charlie]

In my case, they showed me the spray patterns. I had one injector which looked pretty clogged up before (by considering the amount of spray) and after they did their thing, the amount of spray was a bit higher.

[Sierra Charlie]

How do they compare the performance of injectors before and after?

BTW there is nothing wrong with the arrangement of Asnu as I see it. It is their specialty and their division of labor. Even Mr. Dhammika does the same thing.

I do agree. My experience with the gent at Asnu is actually quite pleasant.

It's just that I don't like the situation where the mechanic wants to do various things on the engine and looks for approval from the Asnu gent.

For example, I went to Asnu straight after meeting Mr. Fernando. He had everything set properly and wanted me to get the injectors cleaned. When I went to get the injectors removed, the mechanic started saying the TPS was set wrong, etc. I patiently listened and told him that I was asked to come to Asnu by Mr. Fernando and I'm coming straight after meeting him. That put an end to the sales pitch. But the fact of the matter is, if you're not sure of your tune up, you can be taken on a ride.

[Rumesh88]

In my case, they showed me the spray patterns. I had one injector which looked pretty clogged up before (by considering the amount of spray) and after they did their thing, the amount of spray was a bit higher.

While they may do a good job of cleaning of which I fully agree, spray pattern alone would not guarantee proper working of the injectors. In fact the idea of cleaning injectors is to make sure that each injector delivers the same amount of fuel when opened for the same time period. (One even might argue now the cleaned injectors delivering more fuel than before how would you expect a better fuel efficiency - that's a wrong analysis). In fact if you want to test the injectors for equal fuel delivery they should be put on a test rig and operate for a time long enough to actually measure and compare the amount of fuel delivered. I do not know if anyone is doing this here. It is very important that injectors deliver same mount of fuel under same conditions (fuel pressure and time) and it is the very reason why one should change all injectors at the same time.

[PreseaLover]

Hmmm this process sounds like a rollercoaster... When i called asnu yesterday and asked about the process, the guy said they will plug the car to the machines and check if everythig is in order and if not they will suggest what needs to be done... I told i need only to clean the ful injectors and he said they have to check first etc and explained the process to me which i lacked to grasp as im new to all of this...

So now does this dammika guy do the same process? (plug into machines and do the checking as asnu and then clean the injectors etc.?) in that case why do we have to go back to asnu to get the rest of it done? (i assume dammika touches only a few areas of this process?)... Wouldnt asnu say that they need to do all the checkups even though i only want to clean the injectors? (just like what they told when i called?)

I'm sure I'll be taken for a ride because i know nothing regarding these technical aspects... Anyway how long will this whole proces take and how much cash should i be prepared to throw, in the worse case? Can someone send me dammika's number please?

[Davy]

While they may do a good job of cleaning of which I fully agree, spray pattern alone would not guarantee proper working of the injectors. In fact the idea of cleaning injectors is to make sure that each injector delivers the same amount of fuel when opened for the same time period. (One even might argue now the cleaned injectors delivering more fuel than before how would you expect a better fuel efficiency - that's a wrong analysis). In fact if you want to test the injectors for equal fuel delivery they should be put on a test rig and operate for a time long enough to actually measure and compare the amount of fuel delivered. I do not know if anyone is doing this here. It is very important that injectors deliver same mount of fuel under same conditions (fuel pressure and time) and it is the very reason why one should change all injectors at the same time.

Asnu does have all equipment that tests all aspects of injector function. I haven't been there personally, but I know that they have got their equipment. They actually have the ASNU ultrasonic injector cleaning equipment and the injector testing machine (this one) which tests if all injectors deliver the correct amount of fuel etc.

I knew that the owner of Asnu had an arrangement with another garage to get things done, but all this time I thought that it was the garage situated right behind the Asnu place.

Another place that did this is Nalaka Wheel Alignment Centre in Hyde Park Corner. I have been there once and they did a superb job (there was only one mech doing this job and he was a former A*W guy - knew his stuff and was very good. I don't recall his name now). Cleaned the injectors with ultrasonic, tested them, cleaned the throttle body, replaced plugs and ran a full diagnostic scan and did a trial run. Not sure if they still offer the service.

Edited June 17, 2015 by Davy

[PreseaLover]

Asnu does have all equipment that tests all aspects of injector function. I haven't been there personally, but I know that they have got their equipment. They actually have the http://www.asnu.com/'>ASNU ultrasonic injector cleaning equipment and the injector testing machine (http://www.asnu.com/asnujunior.htm'>this one) which tests if all injectors deliver the correct amount of fuel etc.

I knew that the owner of Asnu had an arrangement with another garage to get things done, but all this time I thought that it was the garage situated right behind the Asnu place.

Another place that did this is Nalaka Wheel Alignment Centre in Hyde Park Corner. I have been there once and they did a superb job (there was only one mech doing this job and he was a former A*W guy - knew his stuff and was very good. I don't recall his name now). Cleaned the injectors with ultrasonic, tested them, cleaned the throttle body, replaced plugs and ran a full diagnostic scan and did a trial run. Not sure if they still offer the service.

You got it done from nalaka? That's walking distance to my office, I shall go there in a while and ask them... How long did it take? And the pricn?

[Sierra Charlie]

I knew that the owner of Asnu had an arrangement with another garage to get things done, but all this time I thought that it was the garage situated right behind the Asnu place.

There's a new building where Asnu used to be. Now Asnu is in the first floor of the adjacent building. Basically, moved from the old building to the next.

It could be the same mechanic. But the mechanic has moved to some place about 500 meters away.

[Sierra Charlie]

So now does this dammika guy do the same process? (plug into machines and do the checking as asnu and then clean the injectors etc.?) in that case why do we have to go back to asnu to get the rest of it done? (i assume dammika touches only a few areas of this process?)... Wouldnt asnu say that they need to do all the checkups even though i only want to clean the injectors? (just like what they told when i called?)

I'm sure I'll be taken for a ride because i know nothing regarding these technical aspects... Anyway how long will this whole proces take and how much cash should i be prepared to throw, in the worse case? Can someone send me dammika's number please?

The thing about Mr. Fernando, (You'll realise why I call him Mr. Fernando when you meet him) is the guy is quite different from the run of the mill makabaases you meet. His approach is quite professional and his advice is usually spot on. I've never heard of him ripping off anyone else either.

He doesn't have a proper injector cleaning setup, so he suggests that we go to Asnu to get that done. My experience with the guy is quite good which is not the case with many of the usual mechanics out there. Anyway, his number is 0112694223.

[PreseaLover]

Asnu does have all equipment that tests all aspects of injector function. I haven't been there personally, but I know that they have got their equipment. They actually have the http://www.asnu.com/'>ASNU ultrasonic injector cleaning equipment and the injector testing machine (http://www.asnu.com/asnujunior.htm'>this one) which tests if all injectors deliver the correct amount of fuel etc.

I knew that the owner of Asnu had an arrangement with another garage to get things done, but all this time I thought that it was the garage situated right behind the Asnu place.

Another place that did this is Nalaka Wheel Alignment Centre in Hyde Park Corner. I have been there once and they did a superb job (there was only one mech doing this job and he was a former A*W guy - knew his stuff and was very good. I don't recall his name now). Cleaned the injectors with ultrasonic, tested them, cleaned the throttle body, replaced plugs and ran a full diagnostic scan and did a trial run. Not sure if they still offer the service.

I went to nalaka place just now... Nalaka is no more and the place is taken over by FIRELLI (Toyota Lanka) and they said they do only Toyota vehicles....

[PreseaLover]

Asnu does have all equipment that tests all aspects of injector function. I haven't been there personally, but I know that they have got their equipment. They actually have the http://www.asnu.com/'>ASNU ultrasonic injector cleaning equipment and the injector testing machine (http://www.asnu.com/asnujunior.htm'>this one) which tests if all injectors deliver the correct amount of fuel etc.

I knew that the owner of Asnu had an arrangement with another garage to get things done, but all this time I thought that it was the garage situated right behind the Asnu place.

Another place that did this is Nalaka Wheel Alignment Centre in Hyde Park Corner. I have been there once and they did a superb job (there was only one mech doing this job and he was a former A*W guy - knew his stuff and was very good. I don't recall his name now). Cleaned the injectors with ultrasonic, tested them, cleaned the throttle body, replaced plugs and ran a full diagnostic scan and did a trial run. Not sure if they still offer the service.

I went to nalaka place just now... Nalaka is no more and the place is taken over by FIRELLI (Toyota Lanka) and they said they do only Toyota vehicles....

[Crosswind]

The reason for this confusion is what we call engine tuning here in Sri Lanka is NOT real engine tuning. It's more of a ignition system clean up.

What ASNU does is ignition system cleaning, while Dhammike Fernando is a proper engine tuning specialist. This includes testing ignition timing, valve timing, fuel pressure and many other indicators (honestly I am not aware of all the tests and adjustments).

Ignition system cleaning (injector cleaning and related clean-ups) is something that should be done once in a while for a car in Sri Lanka. May be once every 20-25k kms through ultrasound and every 5000kms through a petrol additive,

For modern EFI cars, proper engine tuning is not really necessary but its good to take your car to Dhammike Fernando once, because he can tell you the true condition of your engine. You may also get most of these info using a diagnostic scanner but the trouble in Sri Lanka is most of the people in service centres (even at the agents) know only to read and clear fault codes. Diagnostic scanners can tell you for example, the fuel pressure but our mechanics don't know what is the right pressure for which car - even the mechanics at the agents. This is why Dhammike Fernando's services are valuable. Only difference is he uses old-school equipment which is also capable of many adjustments.

I'm actually planning to take my Mazda to Dhammike Fernando sometime soon, because it has an unexplainable vibration and I am fed up with Mazna who suspects one unavailable part or the other.

[aps]

@Crosswind

Try mr.kumarasiri - 071-2779412 (maharagama) for ur mazda

since he do professional job at reasonable price with a guarantee

[Rumesh88]

I'm actually planning to take my Mazda to Dhammike Fernando sometime soon, because it has an unexplainable vibration and I am fed up with Mazna who suspects one unavailable part or the other.

Just a wild guess but it could be one of the injectors delivering more fuel than the other three causing engine to unbalance. There are three factors to check in an injector.

1. Equal fuel delivery

2. Spray pattern

3. Residual leakage when the injector is closed.

[aps]

I had serious misfire in my car

https://drive.google.com/file/d/0B9suRycHWIzsTWg0dXNtQUdRY29DY2kwdlRMYWdqTndZUDVZ/view?usp=sharing

tested with oscilloscope and did map sensor pressure check, found my TB pressure changing time to time (wrong valve timing) since it is necessary to find timing marks it takes full day or more time to fix it.

like Rumesh88 said it can be injector or may be something else. there are lot of DIY stuff since internet on our hands its matter of google.

one example i can give - my car was doing 10-12 Km/l last few months (without A/C ) with new HT leads(tesla),Plugs (ACdelco) and changed vacuum hose to TB, mileage jump to 16km/l while valve timing issue yet to fix.

Edited June 18, 2015 by aps

[Rumesh88]

I had serious misfire in my car

https://drive.google.com/file/d/0B9suRycHWIzsTWg0dXNtQUdRY29DY2kwdlRMYWdqTndZUDVZ/view?usp=sharing

tested with oscilloscope and did map sensor pressure check, found my TB pressure changing time to time (wrong valve timing) since it is necessary to find timing marks it takes full day or more time to fix it.

like Rumesh88 said it can be injector or may be something else. there are lot of DIY stuff since internet on our hands its matter of google.

one example i can give - my car was doing 10-12 Km/l last few months (without A/C ) with new HT leads(tesla),Plugs (ACdelco) and changed vacuum hose to TB, mileage jump to 16km/l while valve timing issue yet to fix.

Looks to me like one of the intake valves leaking but not a timing problem. What made you think it was a timing issue?

[aps]

Looks to me like one of the intake valves leaking but not a timing problem. What made you think it was a timing issue?

checked plugs in each cylinder after 10-20min run (new > plugs, HT leads,Air Filter)

C1. black soot

C2. black brown

C3. brown

C4. white

my car engine(c12NZ) has single point injector and recently done valve repair (de-carbonizing, reseating valves)

Edited June 18, 2015 by aps

[iRage]

I am all up for people tuning and taking care of their cars; but I have to ask !

Why do u think 9kmpl is bad for your car ? Considering its size (physical) & age I would have thought it to be decent. Also about the prev getting 10kmpl, well circumstances would have been different 5 years ago and between users. What I am trying to say is just because your fuel figures are slightly off that what someone else said it was doesnt mean your car is messed up. But yes u should tune your car for preventive maintenance but not necessarily to go from 9 to 10kmpl !!

[Rumesh88]

checked plugs in each cylinder after 10-20min run (new > plugs, HT leads,Air Filter)

C1. black soot

C2. black brown

C3. brown

C4. white

my car engine(c12NZ) has single point injector and recently done valve repair (de-carbonizing, reseating valves)

My apologies for taking the thread a bit OT!

I still believe it is an issue with one of the intake valves. Since you are into DIY why not make a signal pick up for HT wires (any ad hoc thing like 100 turns on any magnetic core would do), put it around one of the HT wires (make sure the insulation is good or have the pick up well insulated) and sync it with the other channel (CH2). If you get 4 peaks of MAP signal in between then the leak is common to all four cylinders and it is a timing issue. But if you get only one peak per each ignition signal then the issue is limited to one valve. You can even find out the leaky valve by noting the HT wire producing a signal immediately before the MAP peak assuming the leak occurs on compression stroke.

Edited June 18, 2015 by Rumesh88

[aps]

My apologies for taking the thread a bit OT!

I still believe it is an issue with one of the intake valves. Since you are into DIY why not make a signal pick up for HT wires (any ad hoc thing like 100 turns on any magnetic core would do), put it around one of the HT wires (make sure the insulation is good or have the pick up well insulated) and sync it with the other channel (CH2). If you get 4 peaks of MAP signal in between then the leak is common to all four cylinders and it is a timing issue. But if you get only one peak per each ignition signal then the issue is limited to one valve. You can even find out the leaky valve by noting the HT wire producing a signal immediately before the MAP peak assuming the leak occurs on compression stroke.

Rumesh88

sorry forgot to tell it has single pickup for each wire (old time distributor) C12NZ it's kind of common to all four cylinders like you said,

engine timing check by professional (Mr.Kumarasiri ) had no time (went there 4pm) to fix. since he ask for a full day to check properly, i have to go back.

today im hoping to do eco test let see what i gain so far in papers.

[PreseaLover]

So I went to Mr. Dhammika.... yes, he is a real professional gentlemen.... He said I don't need to clean my injectors, and he did the needed... Cleaned my petrol filter, but said I need to replace it... Replaced the air filter though... took a good 2 hours and did the checking up for a decent price... Also said I need to replace the diodes of my alternator as it might affect the battery and sensors... However after the tuneup, I felt a difference in the driving, felt more comfortable than before and the small vibrations that were existing, vanished away and now it drives smooth... Thanks for recommending him....

On another note there were 2 more Presea's there today when I went for the tuneup

However, I will check my fuel consumption tomorrow evening and let ya"ll know if there is a difference... I'm wondering, whether will there be any difference in the fuel consumption until I replace my petrol filter and clean up the petrol pump... any clue?

Edited June 20, 2015 by PreseaLover