Starlet Turbo S Engine Knock

Graphite · Post by **Graphite** » Sat Oct 29, 2005 3:37 pm

I bought this cheap starlet, due to the fact it has an engine knock.

It makes a loud kinda tap tap tap tap noise when its idling, for say 10seconds, then the noise goes away for about 15 seconds, then comes back, then goes etc.

Whats this most likely going to be?
Run a bearing I'm guessing, but i thought it would make the noise all the time. when its not making the noise it sound nice n quiet.

Post by **Mr Revhead** » Sat Oct 29, 2005 3:46 pm

could be waterpump....
but impossible to say with out hearing

Graphite · Post by **Graphite** » Sat Oct 29, 2005 4:03 pm

yeah, well its more of a tapping than a knocking..
but i thought if it was bearings that it would do it all the time or noisy on startup and then get quieter.
I just dropped it off to me mates to check out.. will see how it goes

fuel · Post by **fuel** » Sat Oct 29, 2005 4:55 pm

What did ya do with your Sigma?

Graphite · Post by **Graphite** » Sat Oct 29, 2005 8:15 pm

Sold that on trademe, wasn't a bad car really, but used about as much fuel as the wrx.

SIDE_FX · Post by **SIDE_FX** » Sun Oct 30, 2005 2:23 am

ive heard bottom end knock is really deep thump and is really evedent at 3500rpm

evil_si · Post by **evil_si** » Sun Oct 30, 2005 9:26 am

cannot diagnose any engine noise properly without hearing it and inspecting it.

you will get dozens of responses of its your bigends from people that dont know anything about engines.

bearing noises can vary, in sound, how frequent it is,

take it to a decent mechanic and have them check it over, take the sump off and have a look inside, if a bearing has gone or going, the 'cap' will usually be black due to the heat,

Post by **Mr Revhead** » Sun Oct 30, 2005 9:54 am

that man speaketh with wisdom

Rob · Post by **Rob** » Sun Oct 30, 2005 10:27 am

Give it a good engine flush and oil change, if it is tapping and not knocking then it could just be hydraulic lifters just mitsipushi's do all the time

loose_unit · Post by **loose_unit** » Sun Oct 30, 2005 11:02 am

They don't have hydraulic lifters. Could just be bad cam clearances or something simple.

dotdog · Post by **dotdog** » Sun Oct 30, 2005 11:25 am

they brake the lifters off as well which may be ur tapping noise, but after having to rebuild my one at 150,000kms and lookn at the big ends it will more likely be ya big ends

sergei · Post by **sergei** » Sun Oct 30, 2005 10:14 pm

or sticking torsional spring between the drive gear and sub gear on intake cam shaft...

Post by **Mr Revhead** » Sun Oct 30, 2005 10:28 pm

yes yes good point
F heads are prone to that