Technical Bravo 1.2 start up problem

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Technical Bravo 1.2 start up problem

Wakka

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Hi dear friends,
this is my first post in this Forum.
I have got a Fiat Bravo 1.2 16v 80cv of '99 with more than 250k kilometers.
Recently, my mechanic removed and cleaned the throttle body (it was very dirty) and diverted oil vapor blow from the air inlet duct.
Now the problem is that, at the start up, rev counter indicates 1800-2000rpm and after some seconds they decrease firstly to 1500 and then to 800 (or 1200 if the motor is cold).
I am sorry for my bad english and the not very specific terminology, if I am not clear in explaining my problem please tell me it and I will try to explain it in other words.
Here is a little video to explain better what happens at the start up:
www dropbox com/s/xt7177ed41k2yl2/20121207_080900.mp4

I have already tried to remove and remount stepper motor (do you call it ICV, don't you?), reset the various actuators (through Fiat Ecu Scan) but nothing has resolved this!
The TB screw is setted in a perfect way (in corrispondence of the yellow sign in the screw that I think is a factory sign), and anyway the TB is not balked (more important thing).

Can anybody help me, please?
Thank you so much and Happy New Year! :)
 
Someone needs a new battery.
I would say leave it alone, if it does not die at intersections/lights.
Its normal for engine to rev after a start (for example every carbed car I've driven would not idle right after start).
My 1.6 and 2.0 do same thing when cold but the revs drop a lot quicker.
 
Welcome to the forum Wakka. :D

I agree with Neverth the battery needs attention. When the starter motor is spinning all the lights are flickering in time with the starter motor.

First i would try another battery and check the condition of the battery cables and the battery earth cable where it connects to the car body.
 
Yes, you're right about the battery, but the problem isn't it :)
This start up starts when mechanic clean the TB...before, at the start up, revs were 1200rpm when it was cald or 1000/800 when it was hot :eek:
 
it needs to be reset but you will need diagnostic lead and laptop plus the fiat software.

mine was the same and i did the reset and all sorted.
plus the idle adjustment screw (yellow paint) needs to be unscrewed fully before resetting it then adjust it back to 820 rpm.

by the way anyone tell you to disconnect the battery overnight it WILL NOT RESET it.
 
it needs to be reset but you will need diagnostic lead and laptop plus the fiat software.

mine was the same and i did the reset and all sorted.
plus the idle adjustment screw (yellow paint) needs to be unscrewed fully before resetting it then adjust it back to 820 rpm.

by the way anyone tell you to disconnect the battery overnight it WILL NOT RESET it.

Thank you for your answer.
I had both diagnostic lead and fiat software.

Could you explain me better what I have to do? Because I tried this but problem start up persists:
1) fulled unscrewed red circled screw
2) setted key on MAR position (insturment panel ON without start up motor)
3) done a reset of stepper motor
4) shutted down instrument panel
5) adjusted the screw aligned to its yellow sign (yellow arrow in the image)

20130105093524.jpg


TB after shutted down instrument panel on point 4:
20130105093509.jpg


Thank you (y)

There's something I wrong?
 
The only inlet after the TB is this:
20130105135148.jpg

but it is usually closed with a ermetic plug ;)

After the start up, with hot engine, idle rev is 800rpm so it is normal...the problem is only at the start up.
With hot engine, rev goes to 1600-2000rpm, then slowly to 800rpm.

Before clean TB and remove lungs in the air duct, start up was perfect :cry:
 
Last edited:
to reset the idle with your lead and software you need to unscrew the idle screw so its not touching.

if you are using fiatescuscan or multiscan you would click adjustments then execute the reset (top one) not the phonic learn.

after you have carried out the reset and you start the car it will at first rev high and slowly go lower untill it ticks over by itself.

if it stalls dont panic just screw the idle screw in a full turn each time so you can just have it ticking over.

then reconnect to the car again and choose peramters and put a tick next to the (engine speed) so you can see the rpm of what your engine is running at.

then all you have to do is slowly tighted the idle screw again untill your pc says 820 rpm

job done.
 
once you have done that you will need to increase the rpm upto 4500 rpm and hold for 3 seconds and repeat 3 to 4 times then your engine managment light will also stop blinking and dissapear.
 
Please be patient, but I don't understand this:
after you have carried out the reset and you start the car it will at first rev high and slowly go lower untill it ticks over by itself.
What does "tick" means? Touch? Or you are speaking about "tic tac" sound that I hear something?

if it stalls don't panic just screw the idle screw in a full turn each time so you can just have it ticking over.
And this what does it mean?? :bang::bang:

Could you explain me better the procedure?
I understood until make the reset of idle actuator, then I should screw the idle screw, but how? According what standard?
 
tick = engine running

just follow this guide

1) reset ecu perameters by choosing adjustments
2) click execute
3) press Y = continue

then says COMPLETE

4) start engine
5) if car engine stops then tighten screw a little and start engine again.
repeat this untill engine stay running
6) check engine rpm and tighten screw slowly untill pc say 820 rpm
7) if engine light flashing on dashboard press accelerator to 4500 rpm for 3 seconds then repeat 3 more times.
8) turn off engine
9) start engine
should be all ok now.
 
Thank you for you patient and guide but I think that what you written has no sense with Bravo 1.2...I explain better myself:
car cannot never stops itself changing idle screw because TB is controlled by stepper; so with engine started, idle screw has not influence to the TB from status start to the opening of TB setted by stepper...
Idle screw seems to be irrelevant because stepper set minimum opening (engine stopped) and idle opening (engine started)

Or maybe I yet didn't understand nothing :confused:
 
no what i am trying to explain is you need to do the stepper reset first with yellow screw fully undone

what you have done is you have reset your stepper with yellow screw still in factory position same as your photo...is not correct!!

unscrew yellow screw then reset stepper, then reset all perameters then follow last instructions i post

so far you are doing it wrong
 
no what i am trying to explain is you need to do the stepper reset first with yellow screw fully undone

what you have done is you have reset your stepper with yellow screw still in factory position same as your photo...is not correct!!

unscrew yellow screw then reset stepper, then reset all perameters then follow last instructions i post

so far you are doing it wrong
As you suggested I tried (yesterday) to unscrew totally yellow screw then I reseted stepper motor (first option in Adjustements):
I follow this steps:
- unscrew totally yellow idle screw
- reset stepper
- started the engine (it goes to 1800/2000rpm then slowly decreases to 1100 because cold engine)
- tighten screw until yellow factory sign (as in photo)
- shutted down engine
- waited 30 seconds or one minute

- started again engine: 2000rpm :bang:
 
you are still doing it wrong my friend
you need to reset the stepper first with screw undone
then when you have done that there is another reset selection that will reset all the perameters for the ecu and other sensors.
if you look in the adjustments menu in fistecuscan you will see choice for idle stepper reset and perameters learn reset or something like that.

you need to execute both of them first the stepper reset then the full reset.

then start engine and when the engine is running you tighten screw untill you rpm says 820 on your pc or laptop.

after you have done all that if your engine light is flashing you then need to rev the car engine up to 4500rpm and hold for 3 to 5 seconds and repeat 3 times.

if your engine light is not flashing or on then you need to drive the carfor 75 km at 50km no more.
 
Ok ok...your last post seems different from what you said in other posts.
Let's see if I understand now:

1- unscrew totally yellow idle screw
2- key on MAR
3- reset stepper
4- reset ecu values
5- key off 30seconds (as suggested in fiat ecu scan)
6- key on 30seconds (as suggested in fiat ecu scan)
7- start engine
8- tight screw until my rpm says 820 in laptop (this seems hard because rpm is setted from stepper and idle screw has no power...)

if your engine light is not flashing or on then you need to drive the carfor 75 km at 50km no more.
I tried both reset a lot of times and never engine light turns on... Anyway, 75km driven with speed 50km/h?!
FiatEcuScan says just "drive for 10km".

I will try your suggestions as soon as possible, I hope to solve, this is the last attempt, I tried pratically every thing :worship:
 
a very easy way to tell if stepper is faulty is to take the stepper off completely but leave the wired plug connected to it and tie it out of the way.

then adjust yellow screw so engine will run by itself.

drive the car and if you have lots of power and rpm goes down as it should
then your stepper is faulty and needs replacing.

i promise you this will work.
 
Thank you for your help friend, but you suggest didn't work.
Maybe this works for your brava 1.2 '00 with another ecu but with mine it doesn't.
Starting engine now revs high to 1500, 300rpm more then before.
I hope someone will help me
 
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