The car is a Peugeot 207 1.6, over the last year it has started to consume oil to the point where it now drinks one litre of oil every 3000 kms. Last week started to misfire only when hot and only at idle, I got a code P1337 "Cylinder 1 misfire."
The car makes plenty of power and the coolant level hasn't changed.
Fuel pressure is OK.
Coil and injector pulse are present during misfire.
Changed coil to cylinder 2, spark plug to cylinder 3 and fuel injector to cylinder 4. Still misfires on cylinder 1.
Checked compression and every cylinder makes 150 psi dry and wet.
Since only 1 cylinder is affected, I highly doubt it is related to a timing problem, to a plugged exhaust or intake or to a deficient MAP or IAT sensor.
The best explanation I can come with is that the valve guide seals are broken. And when the oil is hot there is enough leakage to produce the misfire at idle.
I am currently waiting on delivery of the tools to remove the camshafts and further inspect the valvetrain and the valve stem seals. But in the meantime I wanted to know your opinions.
Do you agree with my diagnosis?
Is there something I have not ruled out?
I don't own a leak down tester, but maybe I could procure one without too much hassle.
Do you think it will be wise to perform a leak down test to get a more complete analysis?
Thanks for all your help.
The car makes plenty of power and the coolant level hasn't changed.
Fuel pressure is OK.
Coil and injector pulse are present during misfire.
Changed coil to cylinder 2, spark plug to cylinder 3 and fuel injector to cylinder 4. Still misfires on cylinder 1.
Checked compression and every cylinder makes 150 psi dry and wet.
Since only 1 cylinder is affected, I highly doubt it is related to a timing problem, to a plugged exhaust or intake or to a deficient MAP or IAT sensor.
The best explanation I can come with is that the valve guide seals are broken. And when the oil is hot there is enough leakage to produce the misfire at idle.
I am currently waiting on delivery of the tools to remove the camshafts and further inspect the valvetrain and the valve stem seals. But in the meantime I wanted to know your opinions.
Do you agree with my diagnosis?
Is there something I have not ruled out?
I don't own a leak down tester, but maybe I could procure one without too much hassle.
Do you think it will be wise to perform a leak down test to get a more complete analysis?
Thanks for all your help.