Mark x 250g rpm unstability

[haniyasaleem0623]

Guys please help me out my toyota mark x250g has unstable / dancing rpm
When i turn on my car it shivers when i accelerate it the rpm has no power
I changed the coils , i put in new fuel pump as it was faulty had no pressure i changed the fuel injectors but nothing helps its the same my car starts with zero power
The mechanics insisted on putting oil in valves/ head but the head showed no fault at all
No errors on the scanner too i am clueless
Suggest a garage or provide contact number of any professionals and OGs of mark x so i can further investigate as to what the problem ia
Your help and suggestions will really help

[pwuser164163568474]

Sounds like you have misfires. If there are no codes or CEL I would doubt that it is some kind of sensor. Have you tested the coils? My mark 2 had all its coils crap out which caused similar behavior, the computer would only be able to find misfires.

If you are unsure if the oiling in the valves/head would make a difference your best bet would be to do a compression test. A mechanic would put in a pressure gauge inside where the spark plugs go to see if there is enough pressure, this would show you your engine health. These are simple things any mechanic can do so go to your preferred vendor. Wishing you good luck and do update if you find a solution!

[haniyasaleem0623]

Brother i upgraded the coils box pack costing 18k
I put in new fuel injectors
I did try to change mannifuel nothing makes a difference ..
What my doubt is if i am not wrong i think its either airflow malfunction , map sensor or maybe the map or oxygen sensors or maybeeeee injector driver
This has been going on for more than a week now super exhausted your reply meant alot thanks wish me luck and if you come across any idea or any suggestion please lmk 🏼

[pwuser164163568474]

It could be a faulty MAF (mass air flow) sensor or connection but a skilled mechanic would be able to tell this from any kind of reading with a computer.

If we logically look at this; misfires are created from 4 things;

Spark - which you covered with new coils and I think your mechanic would have told you if your sparkplugs were damaged .... (right?)
Fuel - You said that you changed the pump and injectors so the only real problem left would be some bad quality or really old fuel, or literally no fuel in the tank, and a faulty MAF sensor
Timing - Now this one would hurt if something is wrong here, this would be your belts, vacuum leaks and compression issues.

There is usually another section for air, but I combined it with other issues like the MAF, vacuum leaks, piston rings since they are so closely related

[haniyasaleem0623]

I have noted down all your points
I am at the mechanic still trying to get into the depth of this
If he fails to find a solution than i know i will have to go to a PROPER GARAGE and people who have worked with this machine before and are more experienced 🥺 hoping my baby roars again just the same way i first got her
Now i will be asking my mechanic to inspect all your given keypoints
Thankyou again for taking out your time replying

[haniyasaleem0623]

Oh and as per the spark plugs he said they were perfect we got them charged and they were good
And sorry one more thing that might help you understand a little is a few days back when i had no issue with my mark x i was getting tank filled up all of a sudden out of the blue the
petrol pump guy randomly came and said you have alotttttt of gas in your fuel tank you need to sort it out so my mechanic fixed that and the car was good for a week and later all these misfires and problems started coming up

[pwuser164163568474]

It might make sense to check your fuel filter in this case, since you have already replaced the pump and injectors. Although I have a feeling the MAF is acting up

[haniyasaleem0623]

Fuel filter
MAF
All your key points i got checked from 9:00 am till 12:00pm still trying to get into this
Say a prayer for my baby will post here what the outcome was THANKYOU again.