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Engine misfiring-like noise at 800-1000 rpm

CTS03

By CTS03
in Corolla / Corolla Sportivo Club

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CTS03 Collaborator

CTS03

Posted
Posted (edited)

When my Corolla TS approached ~25,000 km I realized that a “misfiring”-like noise of the engine started happening when the car is moving, with 1st or 2nd gear engaged and I press the gas pedal while the engine operates between 800-1000rpm.

This practically occurs in two situations:

(1) the car starts with 1st gear form a stop and occurs until the engine exceeds 1,000-1050 rpm, and

(2) I am moving with 2nd gear, I release the gas pedal, the engine drops to 800-1000rpm and then I push the gas pedal to accelerate (even slightly).

The engine noise scales from slightly arrhythmic bass engine noise near 1000rpm to very arrhythmic tremble noise near 800rpm.

It can be heard clearly if you have not closed the windows. And it depends on the load to the engine, e.g. it lasts more time and it is intense going uphill. I feel that the engine lacks of torque at these moments, so it should be misfiring.

Please let me know if you have experienced this problem or if you know what is the problem and the possible solution.

Edited by CTS03
Northy Grand Master

Northy

Posted
Posted

if its somthing that you can make happen all the time and your T-Sport has only done 25,000km i would be going to see your dealer cause it would still be under warranty? if it were misfiring it should do it all the time? (through the entire rev range?)

CTS03 Collaborator

CTS03

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I realized these noises after I felt gas smell while accelarting with 5th gear at ~6000rpm, which was probaly coming from the car and not outside.

I have also felt occassionally some weak knocking sounds form the exhaust, which can be heard only with open windows at low rpm (~2000).


martenj76 Enthusiast

martenj76

Posted
Posted

I got the same thing from time to time, but almost everytime when i race and push the engine very hard it sometimes missfire or something because i can feel the engine loose a bit of it's power and i can hear a quiet poof-sound from the enginebay.

I am also interested in if this is a common issue.

sw20r Enthusiast

sw20r

Posted
Posted

have you checked your sparkplugs?

was was your last service, take it back and tell them it happened right after

  • 1 month later...
CTS03 Collaborator

CTS03

Posted
  • Author
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I should add the following info for my experience in the last 1-2months:

Toyota checked the spark plugs and found them clean. I voluntarily changed the air filter but the problem remained.

Toyota mechanics said that misfiring at low rpm is normal because it is a high reving engine!!! But it cannot be normal since it did not happen one year ago.

Practically, my car makes this noise each time I start moving without too much gas and there is sufficient load on the engine (slopy road, high friction road, turning). I have recognized similar noises when old cars start moving at city crossings!

Following Toyota's failure I did a lot of search in forums and it seems that squealing/rattling noises at low rpm are usual in 2zzge engines and related to alternator's belt tensioner and the belt. It has been a TSB for early years' Celicas in USA but there also problems in more recent generation 7 celicas in UK. Thus I cannot exclude the belt/tensioner for causing this problem.

You might have a look on these topics in a very interesting UK celica club:

http://www.celica-club.co.uk/cgibin/phpbb2...34ea734e92f68de

http://www.celica-club.co.uk/cgibin/phpbb2...34ea734e92f68de

http://www.celica-club.co.uk/cgibin/phpbb2...34ea734e92f68de

http://www.celica-club.co.uk/cgibin/phpbb2...bc24e094a52f0aa

MotoMan Veteran

MotoMan

Posted
Posted

It is the Belt tensioner... i had the exact same problem... engine at low rpms.. in 1st or 2nd gear...

all fixed now though

gOODbOYz Grand Master

gOODbOYz

Posted
Posted
It is the Belt tensioner... i had the exact same problem...  engine at low rpms.. in 1st or 2nd gear...

all fixed now though

would it be under warranty ?

my last service i told the mechanic about the issue .. he test drove and noticed the sound as well .. but he recommended i put 98Octane to give better fluid to the engine which might of decrease that particular sound..

  • 1 month later...
CTS03 Collaborator

CTS03

Posted
  • Author
Posted

Finally the noise problem I reported was coming from the alternator's belt tensioner.

It was replaced and my engine sounds so nice again in all rpm!!! That old car-like noises at crossings and start have gone!

MotoMan Veteran

MotoMan

Posted
Posted

It is the Belt tensioner... i had the exact same problem... engine at low rpms.. in 1st or 2nd gear...

all fixed now though

no need to thank me.. just doing my bit for the forums :rolleyes:

  • 1 month later...
CTS03 Collaborator

CTS03

Posted
  • Author
Posted

Finally the noise problem I reported was coming from the alternator's belt tensioner.

It was replaced and my engine sounds so nice again in all rpm!!! That old car-like noises at crossings and start have gone!

It did not last for long!!!

The noise is back, worse, after the first 70+70Km trip of fast driving in a sunny winter day with temperature rised above 15C.

Dear Motoman, what to do now?

MotoMan Veteran

MotoMan

Posted
Posted

mines been fine for over 15,000ks now...

getting it replaced again is probably the only thing you can do

lucio_libre Grand Master

lucio_libre

Posted
Posted

Get them to check the clutch on the air conditioning compressor, the bearings are prone to stuff up, the clutch slips and it makes a nasty hissing noise.

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