Vitz 2003 - Strange Overheat Scenario - Need Advice/Help

[umar47]

Ok thx bro

[Xulfiqar]

Hi Ahsan,

I am currently using a almost 50:50 mixture of Tap-Water and Diluted Osaka (It took 1.5 liters of coolant and some water for the whole system). Nothing else that i know of.

As for the compression test, i'll try to locate a workshop that can do it for me in this week.

Thirdly, i concluded about the radiator being rust free for 2 reasons:
a. replaced it last year with a radiator from a half-cut , it was sparkling rust-free at that time.
b. Currently drained the radiator, no sign of rust in the drainage water.

Secondly it did have one overheat episode in which it automatically turned off, and refused to start (didnt take self) until it cooled down.

Thats the point i want to stay away from Tazmanian Devil type mechanics.

Well,

you used prediluted coolant and then diluted it again? you need a mix of 50% coolant and water by volume.

[Xulfiqar]

And there it went again last night -___- !

Started blinking with AC on after half an hour of driving. When i turned AC off and lay my foot off the gas pedal, it stopped blinking. And this kept on going till Clifton ! i kept on turning AC on and Off. When i got home though i saw that water is still in radiator/bottle and it has not evaporated.

when the cold lamp goes off and you have driven for about 5 minutes, pop the bonnet open and try to press the radiator pipes. They should be hard. And the expansion tank should not be bubbling away or overflowing either.

Check the water pump bleed hole for leakage.

[shadab_lodhi]

Re-torque the cylinder head bolts.

[venomdesire]

You mean the Engine head bolts? Commonly referred to as "head ke bolts" ... ?
or are there some others that need to be checked/re-torqued?

Re-torque the cylinder head bolts.

[Xulfiqar]

Re-torque the cylinder head bolts.

This engine uses torque to yield head bolts, they cannot be retorqued as they stay in their plastic state once torqued down. That is why it is critical to use a torque ratchet to get to the first torque of the bolts by following the torquing sequence and then the final tightening passes of the bolts are advised to be done in "ONE" motion only - that means that if the tightening is for 90 degrees, the mechanic needs to set his tool and workplace that the one fluid motion will complete the action, he should not do two 45 actions - that would render the bolt bad.

The above reason is also why toyota actually tell you to measure the bolts and discard any that are stretched beyond specification.

It is also highly critical to use the correct tool for the bolt heads, its not a regular "baar pael ki L key" - which usually means triple square. Toyota use bihex - it is 12 edged but the intersecting angles of the edges are different.

trying to use an triple square on bi hex bolts usually lead to broken bolts or broken tools

click here for my old thread on this

[saboor73]

Editted

[venomdesire]

Update:

Though the car has stopped overheating now, i have a hunch it might be due to the weather cooling down in the city. In the past days it was well above 42-44 degrees in the day.

Furthermore, Yesterday i got the car checked from a diagnostics center, he told me the car was all fine, with the exception of the MAP sensor going crazy due to CNG... The car had oil on its plug sockets due to the tappet cover being loose (some idiot forgot to tighten it).

Thirdly upon my question of sluggish accelleration and slow gear change (gear tends to pull till high rpms), he told me that your advancer needs to be changed (currently i have Tedomaso installed), he advised me to go for Landi Renzo Step-300.

Any advices on this one >

[pwuser151717064979]

U should check heater core of ur vehicle.

[pwuser153726598226]

I have a similar issue on Vitz 2007 model that my car engine going heat up after 8 to 12 kilometes. Engine mark showing on dashboard screen.
My mechanic scan from computer and it's showing some issue with gear. He change some parts of gear but issue still exists. After sometime he realize that all gear parts should be replaced. He asked for replacing the gear with Kabli. I am using the car almost more than 150 kilometer and it's running fine.

Thanks.