[Yinnyhao]

Hi guys, just replaced my crank sensor and my oil breather valve on my 156 TS 1.6. I'm wondering is there anything I need to do after replacing the crank sensor? When I start it it starts for a second and dies straight away but it keeps doing that continuously if I keep holding the key in the same place. I've tried a ECU reset but same problem. Any suggestions?

 

[Jetronic77]

did you get the old o-ring out when you removed the old sensor? if not, it's likely still in there and the new sensor not seated deep enough.

 

[Yinnyhao]

Yes I did! I'll double check the fitment again tmrw anyways

 

[Jetronic77]

if not that check for air leaks in the intake

 

[mikesalfa]

Did you fit a quality part? You might have flooded the engine if you continued to try and start the car.

Why did you replace the crank sensor? Was it because the car was having trouble starting if that's the case the initial problem is likely to still exist.

 

[Yinnyhao]

The part was OEM. If I had flood the engine what do I do then?
Just took it out again and found that the sensor was covered in some oil. Same as when I took the old one out. Is there any way to clean it deeper?

The car would throw up motor control failure at times. That's why I'm replacing it..

 

[David C]

Just took it out again and found that the sensor was covered in some oil. Same as when I took the old one out. Is there any way to clean it deeper?

I'd be worried if there was no oil on it..... The sensor pokes into the crankcase to a toothed wheel on the crankshaft.

 

[Yinnyhao]

I'd be worried if there was no oil on it..... The sensor pokes into the crankcase to a toothed wheel on the crankshaft.

Oh I see

 

[Yinnyhao]

if not that check for air leaks in the intake

How would I check for that? There didnt seem to be any leaks before..

 

[Alfafrolics]

How would I check for that? There didnt seem to be any leaks before..

Do a physical check on the rubber inlet hose between MAF and TB for leaks/cracks especially on the underside.

 

[Yinnyhao]

I'll give it a check. Just wondering if there was a leak, would be be a cause of the car not starting?

 

[Yinnyhao]

So I've refitted the crank sensor and also checked my spark plugs, they seem okay. I've tried a jump start but still the same. Not sure what else I can do other than leave it for a day maybe

 

[Yinnyhao]

Could it be an electrical issue now? I've noticed when the car tries to start the cabin lights would flicker

 

[Alfafrolics]

So I've refitted the crank sensor and also checked my spark plugs, they seem okay. I've tried a jump start but still the same. Not sure what else I can do other than leave it for a day maybe

So when you checked the plugs were they wet or dry . If they were dry perhaps fuel is not been delivered to the engine.

 

[Yinnyhao]

So when you checked the plugs were they wet or dry . If they were dry perhaps fuel is not been delivered to the engine.

They were mainly dry, should they be wet?..

 

[Jetronic77]

no they shouldn't be wet

 

[Jetronic77]

Was the car a starter before you changed the crank sensor?

 

[Alfafrolics]

They were mainly dry, should they be wet?..

Well if you were cranking the engine and its not starting they should be wet assuming you have fuel in the tank and your fuel pump is working. Canyou hear the pump priming when you turn on ignition ?

 

[Yinnyhao]

no they shouldn't be wet

 

[Yinnyhao]

Was the car a starter before you changed the crank sensor?

Yes..