Hello,
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
last week.
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
damage ?
Puzzled & looking forward to advice,
Peter
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
last week.
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
damage ?
Puzzled & looking forward to advice,
Peter