Mitsubishi Lancer CVT slow acceleration

[hammi]

Hello pakwheels members. I need your help regarding lancers CVT. I bought this car a few months back it had a very good acceleration and was noiseless. After doing the general maintenance it seems to have lost acceleration on full throttle and also making a whining noise on deceleration. Things I have done before the issue started are as follows:

Timing belt and timing bearing replaced. (The older belt was one tooth out of spec/T mark)
Tappets adjustment.
Throttle body serviced. (Butterfly was replaced)
Catalytic Converter serviced.
Map sensor replaced.
used Liqui Moly Injector cleaner.
CVT Oil was changed(Mitsubishi Genuine Diaqueen SP3) The service manual states 8.1 litres but only 5 litres was replaced.
Front shocks and bushings were replaced.
Engine mounts were replaced.

As per my understanding the issue is with the CVT transmission. It feels like the gear is not transferring the power from the engine to the wheels. When I lift my foot a little bit from the accelerator it seems to accelerate better for a while. Also, going downhill or decelerating there is a low pitched whining sound that fades away if put in neutral(I know its not good for the trans but for the sake of figuring out I did once put it in neutral while coasting) and on very very slight acceleration downhill a similar whine of certainly higher frequency can be heard but goes away when more accelerator is pressed. Yesterday I was parking the car on brisking/tapping the accelerator it was making a whining noise which is not coming now.

What can be the issues experts I need your advice. This is prolly my second post so far can someone tag Xulfiqar. Thank you!

There is another issue which I would like to ask. I got the AC serviced and after that the compressor started making a humming noise. On further investigation I found that the AC guy was using Suniso GS compressor oil which is not miscible with R134a. Will changing the compressor oil diminish the humming sound or is the compressor wasted its hardly used for a week on the wrong oil. I asked a friend of mine to bring a bottle of liqui moly compressor oil PAG 46. Is it a good oil?

[hammi]

Anyone?

[hammi]

Need your help people. I have heard the cvt needs to be re-calibrated after changing the oil and at times the valve body needs servicing too is that true?

[humayun.chughtai.7]

@rajaatta ...
He will definitely help you !

[hammi]

Thanks man! Waiting for his reply.

[hammi]

Anybody?

[hammi]

@humayun.chughtai.7 can you tag more people brother?

[humayun.chughtai.7]

Sorry dear but these days forum is not attended by any technical members & gurus. Dont know whats the problem, seems like forum administration is sleeping.

[humayun.chughtai.7]

@Xulfiqar @capsat @Spano

[humayun.chughtai.7]

I will definitely help you but neither I owned any mitsubishi nor I have any experience with CVT.

[shariq101]

All experts are on crackwheels.com

[hammi]

Might be because eid is near. Anyways I will wait till eid ends as workshops will be closed too. I hope someones helps me till then.

[rare]

form where you have done this job?

i guess low oil level in cvt might be the reason as u have mentioned u used 5 ltr but manual says it 8.1 ltr.

[rajaatta]

sorry for late jumping in........
yes its true all technical members are now a days on long vacation from pakwheels just kidding

ok i had read your problem briefly and had studied the symptom diagnostic comparison chart for your vehicle.

1: 1st thing you had done wrong with your CVT trans is changing the Trans oil without analyzing the Fluid pressure.
2: If you had to change the trans oil you should perform aa complete flush procedure.
3: after oil change you had to calibrate the oil pressures to settle the start clutch with new lube's and pressure's
4: If you dont had any kind of info regarding of the maintenance carried out earlier. ( Trans oil change Or oil badly abused by over mile driving ) then you should carry out the VALVE BODY ASSY SERVICE.

NOW COMING TOWARD THE CURRENT SOLOUTION. GET IT DIAGNOSED BY SOME TECHNICIAN AND I MEAN TECHNICIAN NOT ROAD SIDE SCANNER WALA AND GET THE READINGS FROM THE CVT ECU AND INITIATE THE PRESSURE TESTINGS AND MEASURE THE FLUID PRESSURE NORMAL PRESSURE RANGES FROM 3.255MPA UPTO 5.75 MPA IF IT IS LOW FROM NORMAL RANGE THEN PERFORM VALVE BODY ASSY SERVICE ALONG WITH COMPLETE TRANS OIL FLUSH.

Currently you are facing start clutch and braking clutch lag dont try to pull it harder or you will fry your transmission

for more info pm or call me at my cell after eid holidays
Until then Enjoy the Eid e Qurban And some Steaks as well. Have Peace

Regard's
R Atta-Ur-Rehman Mangral

[hammi]

No I checked the oil level on both hot and cold and it was on the marks. They did a oil change not a complete flush, I think the torque convertor and oil cooler holds the extra 3 litres in it.

[hammi]

@rajaatta Thanks for analyzing and a detailed reply. Its the first time I have kept a car with a CVT trans. Pardon my negligence I thought its a regular auto trans oil change. Although I went to mitsubishi motors as I thought they would do the best job but sigh. For an oil change they costed me 12500 and they did not check anything as trans oil pressure or cleaning the valve body they did not even do a complete flush procedure.
I dont have any maintenance history the car was driven 78000 when I bought it now its 84000. When the guy was changing the oil I asked him if there were any metal particles stuck with the drain nut he said no the oil is clear but I remember it was very dirty and viscous like a diesel engine oil.
I will go for a valve body service I think its mandatory now. Also, is there any trans filter inside that needs to be changed or oil strainer?
Can you tell me of a good technician a friend of mine told me about nazir autos in G-8 I went there he said he will do it after eid but I have mixed opinions about him other than being costly.

I dont have your number kindly leave me text(0331-5132923) I will contact you after Eid. Thank you.

[rare]

do check with Lodhi Autos near airport road... never been there but heard good words of their work

[hammi]

Do you have their number?

[rare]

no i dont have. its near Fazal town phase 2 near Hascol petrol station

[hammi]

@Xulfiqar Bhai still waiting for your comment before I proceed.