My car seems to run more difficult at idle when just started. The ecu tries
to rev up irregularly and sometimes the rpm gets really low for a while.
When driving, fuel consumption has gone up when accelerating - which is not
as vivid as before - and even at cruise is slightly higher than before.
Could this be an indication for head gasket problems ?
I will have someone check fuel system problems, but this is the story from
One mechanic replaced coolant liquid by just filling up the radiator a bit
with the engine at idle, and adding more at large intervals of time -
instead of using the vent plug near the thermostat. The thermostat appears
to have a vent hole though.
He did not drain the cabin heater as far as I know, because he added less
than the total circuit content. He also used some water for flushing first,
but I can't tell how much.
I wonder if a head becomes warped when the engine overheats slowly at idle ?
He did not rev up until he had added more coolant and the fan had turned on.
Can a head overheat and not warp ?
Still, compression tests show good values, this time when hot and full
throttle, 17 bars on all fours. When measured cold and closed throttle a
while ago, it was 15 bars.
Since then I read posts about oil control rings, and the above would not
exclude oil ring problems and better compression values due to oil - which
is consumed in a more than normal way - I sucked some burned oil out of the
cylinder with a tube and vacuum.
For the rings, maybe my style of driving - very low throttle - and oil
consumption could lead to other problems, I read about glazing ? I would be
tempted to step on its
tail and open the throttly, but the head gasket could fail ?
How can I ever tell the engine has suffered damage from overheating, except
when the head gasket really blows ?
Since fuel consumption has risen only a small amount, could it be ring
Puzzled & looking forward to advice,