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Discussion Starter #1
Hi, I am new to this forum, I just bought a 2002 156 2.5L

The car starts fine when its cold, but takes a while to start when its on temperature
Does it sound like a crank positioning sensor?
 

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Possibly, although when a crank sensor fails its not so much a question of "taking a while" to start - it'll flatly refuse to do so for 15 - 20 minutes until its cooled enough. If its just hard to start, then its more likely to be a temperature or lambda sensor that's sending odd signals to the ECU, I'd have thought....
 

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Discussion Starter #3
Thanks, I serviced the car, and it got a little worse, when I'm driving and press the clutch peddel in it idles very low and sometimes die, I'm going to a service center this weekend so they can run a diognostic
 

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Discussion Starter #4
The diagnostics didn't show any fault, I replaced the crank position sensor but it didn't fix the problem. I will replace the temperature sensor and see if it works, Does anyone have any ideas?
 

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Discussion Starter #5
The guy said he doesn't think its the temperature sensor, I should look at the petrol pump, is this possible,maby just the relay? I also noticed when I turn in a sharp corner it cuts out for a few seconds,it was on a quarter tank, I will test it on a half tank later if it does the same.
 

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Discussion Starter #6
I took the car to the dealer to find the problem, and they said that when the car is started the fuel pressure is low, so it looks like the fuelpump is the problem.
Does anyone know if I can buy just the pump or do I need to buy the whole unit?
 
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First fuel pump that I have ever known to fail, thats a new one on me... Lift up the rear bench seat and make sure the outer plastic ring is nice and tight on the top of the fuel tank (through the inspection cover) That is the top of the fuelpump/sender unit all in one... You can get them from many breakers yards now very cheap and plentiful. Or even Ebay from a reputable source like Autolusso for example.

Low pressure is a new one... The pump builds the pressure so it is constant, it either works or it doesn't.....A faulty seal on the top of the fuel tank or even the fuel filler neck, then the drop in pressure could have a bearing on low pressure and make a "good" fuel pump struggle...
Sorry but I wouldn't accept that kind of sloppy non descript answer from a main dealer, it needs further investigation..
Try an idependant Alfa specialist in your area first and explain everything you have replaced, checked and been told. They will confirm it's the pump or laugh their ars* off at the main dealers fault finding abililities:thumbs:

Just as an afterthought, remove the relay thats situated in front of the battery for the fuelpump clean the male and female connections and follow the earth wire to it point of its termination the chances are it just could be a bad earth that is breaking away as you corner! Thus causing your cutting out. It will also produce a voltage drop on the pump itself so check the wires on the pump with a multi-meter for low voltage when its running.... Simple as that really... Another thing a main dealer would neglect to check Its too simple an item of common sense for them.
 

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Discussion Starter #8
Thanks for the great advice, I contacted the dealer and asked what they considered to be low pressure, I thought that low fuel pressure would show an error on the laptop, he said it doesn't because its a mechanical fault, which parts could this be? He also said they found that the starter draws more power than it should, but I don't think thats the issue here is it? I lifted the seat up,the seal looks fine and cannot smell petrol, I will trace the relay ground wire tonight and see if I find anything, I'm going to give the car to an alfa specialist this week and tell him the storie
 

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Discussion Starter #9
I removed the fuel pump and found that it was already replaced, but with a VDO pump which is smaller then the original and doesn't have the right connecters,1 connecter sprang of then I touched the pump,The siff on the bottom of the pump was also dirty on the inside(doesn't that break the pump?)I am going to replace the pump and give feedback
 

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Discussion Starter #10
Pump installed and problem solved
It starts immediately when warm and idling doesn't drop when warm
And it doesn't cut out in a corner
I guess this was a unique problem
 
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