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[same #same#]

and in pic looks as there is a crack or chip in the of center left part of the chip.

[Ali Ch]

the bottom is nice.....so as the lid......it was covered with a small plastic cup (four of them) and a clip so as to be firmly attached to the metal body of the casing to act as heat sink (which i removed to check them)....the plastic cover was ok too

[same #same#]

was meaing this.

[Ali Ch]

yes....that what i first noticed...some times ICs do have such cracks when they come out of the factory, it would be only in its plastic case not in the chip inside....but if it was originally ok then this is due to over heating......i think i have to fetch some ecu and test it in my car before i attempt buying one.
now i have to look for a donator tomorrow  :-/

[same #same#]

gm dont do damaged chips in there stocks every iterm is checked, if there is a crack in a chip they dont last more than a year, have a few ecus here at home and none have any chips or cracks in any thing, would say that is the fault, air is getting it to the chip backerlight case when it crack make the micro wires move or snap.

[Omegafantasy]

That IC has at least been overheated. I don't know if it's due to lack of cooling or internal failure, but I would definitely change that IC or even the whole ECU.

That IC is an "Octal intelligent power switch with serial input". Datasheet: http://www.digchip.com/datasheets/parts/datasheet/477/TPIC2802-pdf.php

I don't have schematics for that ECU, but I reckon some malfunctions in that driver could cause all sorts of engine management problems.

[Ali Ch]

can i just replace the ecu with one from another car? i have this guy who sell them say that i have to re-program the ecu to work with the car security!!!!!

[Omegafantasy]

That depends if you have immobilizer or not. If you don't have that you can just swap it (with same part number ECU).

[same #same#]

best to get same for same as dif plugs for dif ecu's

[Abiton]

Why did you suddenly decide the ECU is the problem?

I have doubts whether there's anything wrong in there.  If you can get a compatible one to try, I guess that would prove it one way or another though.

It has been running without a working oxygen sensor for how long?  I think your trouble is more likely to be related to this physical situation. 

Will it run well enough to drive it on a nice cruise to burn off some carbon?

Did you look down the spark plug holes for evidence of coolant in any of the cylinders?

[Ali Ch]

hii...thanx for the reply
the car runs well, i just have to select the 1st gear and accelerate slooowly. when i reach 1800 rpm the knocking ceases and i can accelerate normally, but if the gear changes soon so that the rpm drops below 1800 it start knocking again. so i have been driving like that for quite a while.
i did about 300 km since i replaced the oxygen sensor, the run-on is reduced, but not completely gone. the knocking is now continuous, it been few days since its last correct functionality. and it started to wobble and misfire. which i think means the problem is getting worse.
as far as the water loss, i found three leaking points :S fixed one, but didn't find the time for the other two, one of them is behind the alternator.
and the pic in a previous reply is why i am trying another ecu, there is a good chance that two of the ICs is malfunctioning, the small ic has a similar but much smaller defect.

[Abiton]

The reason I'm suggesting you check the possibility of a headgasket leak is that multiple coolant leaks could be a symptom of increased pressure in the coolant system.  It certainly was on our car.

Best of luck.

[Ali Ch]

hmmmm now you are making sense. i ll check it and see.

[Ali Ch]

i changed the ecu today, and no change.
could some thing in the valves cause this??? i keep hearing people saying you have a faulty valve.

[Ali Ch]

hi
i removed the spark plugs last night....did not find any water in the morning, you think that removes the head gasket possibility??
any one knew what is the meaning of the code (1327: Knock control cylinder 2) ?
thanks again