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[Ali Ch]

ok....that is weird....why i am getting an error code (1690:malfunction indicator lamp) ? a friend had a working knock sensor and he suggested that i replace mine to eliminate a malfunctioning knock sensor. when i finished the management light is on....took it for a ride and after a while the light turned off. i did the paper clip test and found this error (along with the old errors i had before, i don't  seam to be able to reset the errors in any way)
did not drive the car for a long distance, but i thing the problem is still there
by "indicator lamp" they mean the light in the dash, i.e. the management light, don't they???

[TestOmega]

Ali Ch have you done a compression check on the cylinders?  If so what was the pressure recorded for all?

You may be looking at  a mechanical issue (stuck valve, partially open valve, etc.).

Specially the cylinder that is being flagged by the diagnostic messages.

Just thinking aloud.

[Ali Ch]

no one has a compression gauge ....all mechanics who suggested a failed valve said they have to open the cylinder head and take a look....seams more damage than fix to me!!!
still....the symptoms is on and off, if there is a stuck valve would it be stuck some time and free some time??? if it is stuck what it is going to take to fix???
another easy way to check may be???

[TestOmega]

Pump air from a compressor at say 100 PSI in the each of the spark plug holes consecutively by making an adapter (say out of a Spark plug)?

See which cylinder is dead when all valves are expected to be closed as the crank moves.

Perhaps someone else can describe it better.

[Ali Ch]

hi again

i was trying to do a leak down test for the past few weeks, but with no luck. i found someone with a compression gauge, he tested but all he said that it is low, i could not get a number out of him. and my engine "mysteriously" broke his gauge. so i thought he did not know what he was doing, beside he did the test some how incomplete.

so i decided to open up and see what is going inside, and i was going to change the head gasket anyway. the head gasket was slightly broken between cylinder 4 and a nearby water hole. but nothing else is wrong with the gasket. the cylinder walls all seam shiny and clean. but i don't know what to look for exactly. if i am going to inspect the valves, cylinders, etc., what i should be looking for?? what are the good and bad signs??
what i can see now is a thin layer of carbon on the piston crown, and also on the very top of the cylinder wall, about 3mm wide.

thanks guys for the help

ps: in the last week, the knocking is some how less, it stops knocking when the rpm is above 1000, some times on less rpm (previously it used to knock up to a 1800 rpm), but the engine is wobbling hard and i can feel it in the steering wheel when the engine is idling. i can't use the AC too, it becomes heavy to drive and when the engine temp reaches 95 i can't stop and move again with the AC on, the engine knocks hard and stops rotating. i turn off the AC, and start and it works :-/

[feeutfo]

Maybe post some pics ?