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Technical Fiat Brava 1.2 16v 2001 MY wont run

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Technical Fiat Brava 1.2 16v 2001 MY wont run

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rwilkes123

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:bang: Hi to every one this is my first post I have been at my wits:bang: end with this car the car starts then immediately cuts out I have replaced the ecu immobiliser & key, throttle body, coil pack, cam sensor & crank sensor the timing has been set with the correct tools the fuel pressure seams okay as well as compression. It will run when we supply easy start to the throttle body & we have put it on a new snap on computer twice the only error code was the cam sensor which has been changed for a new one. Does the throttle body need setting up by fiat as it is a mortised type i have tried the self learning procedure however the car still just starts then immediately cuts out please can someone help or i will have to scrap this car which is a real shame as it is a one owner form new before myself kind regards Richard.
 
hi mate, it sounds to me like your idle control stepper motor is opening as it shud then imediately screwing it to shut the engine down, it is located at the back of the throttle body with 2 torx screws. take it out and start the engine, it shud pulse from 1500rpm to 2thousands. if it runs with it out ul need a new one mate

i had this problem recently on my sporting.

let me know how you get on, hope this helps

regards. ryan
 
I have a potensiometer for a 1.2, I can post it to you if you like it is ok, you can have it just send me your address and I will send it, I changed it on my 1.2 but it didn't sort it, turns out it was a coil problem, which is why I have a spare one, they some times get stuck, when I first got my car it use to have some major throttle moments until I got so hissed off with it I took the P/meter off and pulled it apart, the grease inside was quite hard, washed him out with carb cleaner and silicone greased it, put it back together, wacked it back on, bingo, throttle problems gone!
As I said send me your address and I will post it to you, worth a try for free!
Chris
 
i have washers between mine atm :p until i buy a new one, trying to source one but not from fiat, they want your right arm for it.

id try starting the car and holding the accelerator down a bit, if it runs, the idle control stepper motor is your problem.
 
Hi Chris thanks for the offer I think its worth a go as I have already changed the throttle body the car still just starts & cuts out some times with the pedal pushed rapidly the car will rev to 2500-3000rpm then dies.
 
Last edited by a moderator:
Thanks Adrian the car just cuts out I have tried but it will rev to 2500rpm-3000 then cut out straight away when you say washers between the body & motor is this on a bosh unit kind regards richard
 
Hi Ryan thanks for your postings I will have a look on the spare throttle unit that is off the car but I haven’t found the torx screws you speak of, there is however a plastic cover held on by clips the unit is bosh.
 
oh, sum throttle bodies have the units in without the torx screws, not sure how u would remove these, but if the stepper motor was the problem then pressing the acelerator would bypass it but it hasnt, cant be a faulty crank tdc sensor because it wouldnt run at all, maybe faulty oil pressure switch. i know sum cars will shut the engine off if the oil pressure it realy low.

not sure if u can do a blink test on the sporting? does any lights show on the dash ?

regards, ryan
 
rtmsporting said:
oh, sum throttle bodies have the units in without the torx screws, not sure how u would remove these, but if the stepper motor was the problem then pressing the acelerator would bypass it but it hasnt, cant be a faulty crank tdc sensor because it wouldnt run at all, maybe faulty oil pressure switch. i know sum cars will shut the engine off if the oil pressure it realy low.

not sure if u can do a blink test on the sporting? does any lights show on the dash ?

regards, ryan
Click to expand...
The crank sensor can give intermitent problems they dont just fail in an clear cut on/off way. One example is a weakend crank sensor magnet, even bad fitting/gapping will give problems. None of the petrol Bravo's Brava's or Marea's shutdown based on oil pressure signal. (I dont know about the diesel's)

Richard, If the potentiometer does not work have you checked the simple things first like battery terminals and earth points are properly clean? You may have checked everything and not mentioned it but from the original post. It sounds like you have started with the worst most expencive case scenario, the ECU when infact the ECU is very reliable.

Things like; coil Pack test, Fuel filter, air filter, plugs, leads. Check all relays, connector blocks, fuses, earths are clean, fuel pump, check fuel preassure.

Stupid things like is your fuel definatly good or a bit stale.

The coil pack test its nice and easy if you have a multimeter. Disconnect everthing on the coil pack before testing.
 
Hi Ryan the orange engine management light is the only one to stay on but I don’t think it runs for long enough to make a difference
 
Adrian Bravo said:
The crank sensor can give intermitent problems they dont just fail in an clear cut on/off way. One example is a weakend crank sensor magnet, even bad fitting/gapping will give problems. None of the petrol Bravo's Brava's or Marea's shutdown based on oil pressure signal. (I dont know about the diesel's)

Richard, If the potentiometer does not work have you checked the simple things first like battery terminals and earth points are properly clean? You may have checked everything and not mentioned it but from the original post. It sounds like you have started with the worst most expencive case scenario, the ECU when infact the ECU is very reliable.

Things like; coil Pack test, Fuel filter, air filter, plugs, leads. Check all relays, connector blocks, fuses, earths are clean, fuel pump, check fuel preassure.

Stupid things like is your fuel definatly good or a bit stale.

The coil pack test its nice and easy if you have a multimeter. Disconnect everthing on the coil pack before testing.
Click to expand...
Hi Adrian I have checked every thing twice with an auto electrician friend we have even tested every wire on the two ecu terminal blocks took ages with the data book also we have put it on a new snap on pc only error code cam sensor which is a new bosch one. The coil has been changed along with the crank sensor the spark seams fine we have also tested the fuel pressure it is fine & stable however no harm in checking gap on crank sensor along with a test on the coil will let you know if this helps kind regards Richard.
 
Richard
Potensiometer left me on Saturday 1st class post, so it should reach you hopefully Monday or Tuesday, forgot to say it is a Bosh one 3 torx screws hold it in place, also if the ECU is the same as Renault then you have to clear the ECU fault problem otherwise it will just keep telling you of the cam sensor fault even though you have changed it, this happend on my wifes Renault with an ABS sensor, Even though it was changed it still put the ABS light on, until it was erased from the ECU, so if it does work in the same manor as Renault this could be why it still reads Cam sensor, or the obvious! your new cam sensor could actually be faulty from new.
 
Thnaks Chris will let you know I will also bear in mind to get the error code removed again will keep you posted kind regards richard.
 
Hi Chris i have received for which many thanks it is a different bosh unit fitted to the pedal on mine do you want me to return it to you. Kind Regards Richard.
 
Differant, bummer eh! hoped that might have helped you solve your problem, no need to return do what you want with it, maybe some one else on here may want it.:)
Chris
 
Thanks again Chris I think I know where there is one on a Punto 1.2 that had the same throttle body but with no cam sensor on it will let you know how I get on when things warm up a bit. If any one needs this part i will post it to them gladly.
 
rwilkes123 said:
Thanks again Chris I think I know where there is one on a Punto 1.2 that had the same throttle body but with no cam sensor on it will let you know how I get on when things warm up a bit. If any one needs this part i will post it to them gladly.
Click to expand...

Hi Mr Wilkes,

I've just had mu Brava 1.2 16v on the diagnostics and they said its my potentiometer, I've been looking everywhere for one and noticed your post. Would you be so kind to post it to me I would be very grateful.. Thank you. Graham.
 
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