Technical Engine cut out like crazy/oil on 1 spark plug (Punto 90 1.6)

[chesh]

I've had this problem a few months ago.
Started the car the day later and it was gone.

It happened yesterday, here's a video:



The problem was only when the car is in move. like fuel cut and EML is on when it happened.
Since I can't connect to this ECU, I've checked everything.
Every sensor is new and all the wires seems in place.

I've checked the spark plugs:

No. 3 was covered with oil but only on it's thread.
No. 1 is kind of white/Brown at it's top.

Can oil on the spark plug thread can cause misfire? there is no smoke coming out of the exhaust.
I've cleaned the spark plug from the oil, and the car still drove like that.

Let it rest for the night, started it today and it drives ok. like nothing happened.
Does it sound like a sensor problem or a mechanic one? Is worn piston rings can cause such a problem?

 

[Avaxbox]

If the coil/lead Is not firing it's normal to get oil on the plug

 

[renaultvation]

Check the connection for the crank sensor. The pins are very thin, so bend the contacts out a bit on the female side of the plug to make a better contact. A poor contact here can be triggered by thermal expansion as the engine warms, or by movement.

 

[chesh]

I checked the crankshaft sensor today! It was full with oil, and some of it's wires are exposed:

Tried to get it out but I can't!

It's blocked by the engine/ a/c mount or whatever it is

Anyway, gave it a good clean and bolted it back. car couldn't start.
Twisted it again and played with the wire, it started.
Then I went for a 5 min drive, problem got worse and I couldn't start the car anymore.

Took the sensor a bit out again, wiggled the wire and it started again.
So I'm pretty sure if's a faulty sensor.

How do I get it out without removing half of the car? :/

 

[flisko]

so this was your problem all along, bad crank sensor wiring

 

[chesh]

Changed the sensor today, looks like I solved the problem!

I needed to remove the engine mount in order to get the old one off:

New one is in:

Car started within a second and no problems from what I can feel!

 

[renaultvation]

Good news.

 

[flisko]

i hope you didnt jack car up on sump without any padding, like block of wood