Engine Knock at higher RPM

[mohsin-212]

Assalam Alaikum
My car's engine starts to knock if I accelerate it a little harder like above 2500-3000 RPM and knocking becomes more pronounced as Rapid RPM increase above 3000 RPM . Under normal driving below 2000 RPM it stays normal (no lnocking). What could be the cause and its solutions???

[waqar19]

Which car ?
And for how long you are facing this problem ?

[def3nder]

He has 2005 1.8 auto corolla Altis.

[def3nder]

Mohsin bhai I guess you need to edit or start a new thread for your car and please share all issues you are facing in your car. Because you are facing multiple issues with your car

[mohsin-212]

Actually these issues are all linked together and I want to solve them all one by one. For most of the people these are not even issues but I am extra caring about my car.

[mohsin-212]

Altis 1.8 2005 model 1zz-fe engine

[omersiddiqui5482]

this knocking is possible if the engine is starving off fuel! get the fuel pressure checked and get the car scanned see if any codes pop up!

[def3nder]

For that you knwo these issues are linked all together to better to discuss them together than separately. And i have seen you are facing all these issues after few months of your purchases. And on and off you are facing these issues. Caring for the car is the good thing, but sometimes you just have to ignore something in these old cars.

But these are the real issues and get them fix in the proper way so you wont get the same issues on and off. You are maintaining your car from 3s dealership and still facing these issues. better to find any good local mistry for your car. Your car is just driven 105K driven bhai jan. Consider her as a new car. nowadays 2012,2013 models are driven approx 150K km driven.

The best is to discuss them in one thread so pakwheelers can link up all the relevant issues with one another. Thanks

[anon36782927]

This post was flagged by the community and is temporarily hidden.

[mohsin-212]

car is just driven 105K driven bhai jan. Consider her as a new car

Is he liyay tu itni fikar kr raha hun k I consider it new and want it to remain new as long as possible

[mohsin-212]

but sometimes you just have to ignore something in these old cars.

I believe that "a car is nothing but a combination of different parts put together and as long as these parts are maintained and changed with newer ones the car stays new" no car is old or new

[mohsin-212]

Someone kindly summarize all the possible reasons behind this knocking so that I can address them one by one

[waqar19]

Too many reasons. Could be due to poor fuel quality. Try high octane first.
Other than that there is a bolt like sensor right under intake manifold bolted on engine block. It act as microphone and listen to abnormal pinging or high pitch knocking sounds. If that goes out of order then ECM can't adjust correct ignition timing and result in knocking, no matter at what RPM.

[waqar19]

First check fuel quality then spark plugs. Then fuel rail pressure test to check leaking/bad fuel injectors. Check MAF sensor as well. Sometime it does not throw codes even faulty. Disconnect the sensor grip. Check engine light will be ON and car goes to limp mode. Rev the engine, if RPM does not go above 3000 RPM that means MAF is working. Disconnect battery to remove check light indication.

[def3nder]

please follow waqar bhai for now. and change your auto transmission oil and put back tstat valve.

Share all queries here with waqar bhai

[mohsin-212]

Actually I am worried that if its due to over heating than it may get even worse with Tstat Valve in

[mohsin-212]

no matter at what RPM.

But it starts knocking only if I accelerate a little harder like above 3000 RPM and on sudden acceleration it gets more and more

[def3nder]

How can tstat valve risk overheating issue bro? You have to take car to the workshop bro to get done your work, if we find the solution here, wont help your car standing the park to get it fixed. Manage two three days maximum to get this all work done. Changing trans oil takes about an hour or 1.30 hours. put tstat valve in the car approx half an hour. you already using coolant in your car so , if you lost your coolant top it up. run your car for few minutes or get it fully scanned, check the temperatures other fault errors relating to fuel consumption electrical stuff. service your breaks, get it proper tuned. If you can manage you can do that work in one day otherwise 2 days are enough. Then ride your car and look for any other issues if you face, but hopefully once you have dont all this, you will find things getting improved.

.

[def3nder]

can be bad fuel as well.

[mohsin-212]

Actually Tstat valve restricts flow of coolant even if its fully opened vs if its not installed full flow of coolant enters the radiator thats my point